Rudder Service & Repair

Rudder blade

Also known as: rudder; yacht rudder; sailboat rudder blade

Function or context: Underwater foil that turns the vessel by redirecting water flow

AHI Marine services and repairs: rudder inspection; rudder repair; rudder replacement; rudder damage assessment

GRP rudder blade

Also known as: fibreglass rudder; composite rudder; GRP rudder

Function or context: Glass-reinforced plastic rudder blade construction

AHI Marine services and repairs: GRP rudder repair; fibreglass rudder repair; laminate repair; rudder replacement

Rudder blade halves

Also known as: rudder shell halves; blade skins; port and starboard shells

Function or context: Moulded outer sections joined around the internal structure

AHI Marine services and repairs: rudder split repair; seam failure; blade delamination; shell bonding repair

Rudder blade laminate

Also known as: fibreglass laminate; glass laminate; composite laminate

Function or context: Reinforcing glass-fibre layers forming the blade skin

AHI Marine services and repairs: laminate damage; laminate crack repair; fibreglass reinforcement; relamination

E-glass reinforcement

Also known as: E-glass; chopped strand glass; glass fibre reinforcement

Function or context: Glass reinforcement used in composite blade skins

AHI Marine services and repairs: E-glass laminate repair; glass fibre repair; reinforcement replacement

Gelcoat

Also known as: rudder gel coat; gelcoat finish

Function or context: Outer finish layer on a GRP blade

AHI Marine services and repairs: gelcoat damage; gelcoat crack repair; gelcoat restoration

Epoxy barrier coating

Also known as: epoxy coating; waterproof epoxy barrier; epoxy seal coat

Function or context: Water-resistant coating protecting gelcoat and GRP laminate

AHI Marine services and repairs: epoxy barrier coating; rudder waterproofing; coating renewal

Antifouling coating

Also known as: rudder antifoul; antifouling paint

Function or context: Protective underwater coating applied to rudder blade

AHI Marine services and repairs: rudder antifouling; antifouling removal; rudder coating preparation

Foam core

Also known as: rudder foam core; polyurethane foam core

Function or context: Core material filling the internal volume of a composite blade

AHI Marine services and repairs: foam core damage; water ingress; core replacement; rudder rebuild

Polyurethane foam filling

Also known as: PU foam; expanding foam core

Function or context: Expanding foam fills internal spaces within the rudder blade

AHI Marine services and repairs: foam-filled rudder repair; internal voids; water ingress investigation

Blade seam

Also known as: rudder blade joint; shell seam; trailing edge seam

Function or context: Bonded joint between blade shell halves

AHI Marine services and repairs: rudder seam crack; seam separation; blade split repair

Blade overlap joint

Also known as: overlapping blade joint; shell overlap

Function or context: Overlapping laminate joint that increases blade integrity

AHI Marine services and repairs: blade joint failure; rudder shell bonding; split rudder repair

Trailing edge

Also known as: rudder trailing edge; aft edge

Function or context: Aft edge of the rudder foil

AHI Marine services and repairs: trailing edge damage; rudder edge repair; laminate repair

Leading edge

Also known as: rudder leading edge; forward edge

Function or context: Forward edge of the rudder foil

AHI Marine services and repairs: leading edge impact damage; rudder profile repair; edge fairing

Rudder tip

Also known as: bottom tip; lower blade tip

Function or context: Lower end of the rudder blade

AHI Marine services and repairs: rudder tip damage; grounding damage; blade repair

Rudder profile

Also known as: foil section; rudder section; hydrodynamic profile

Function or context: Cross-sectional shape controlling lift and steering response

AHI Marine services and repairs: rudder profile repair; rudder fairing; blade shape restoration

Rudder stock

Also known as: rudder shaft; rudder spindle; stock

Function or context: Main vertical shaft transmitting steering torque to the blade

AHI Marine services and repairs: rudder stock inspection; rudder shaft repair; bent rudder stock; stock replacement

Rudder stock spokes

Also known as: rudder tangs; stock webs; internal spokes

Function or context: Metal members welded to the stock and bonded into the blade to transfer torque

AHI Marine services and repairs: rudder spoke inspection; internal support failure; rudder stock repair

MIG welded spokes

Also known as: welded rudder tangs; MIG welds

Function or context: Welded connection between rudder stock and internal spokes

AHI Marine services and repairs: rudder stock weld inspection; cracked weld; welding repair

Rudder stock-to-blade bond

Also known as: stock bond; shaft-to-blade connection; internal bond

Function or context: Bonded interface transferring load between stock assembly and blade shell

AHI Marine services and repairs: rudder stock movement; internal bond failure; rudder rebuild

Internal reinforcement laminate

Also known as: extra laminate; reinforcing glass layers

Function or context: Additional laminate securing the internal stock and spoke assembly

AHI Marine services and repairs: internal laminate failure; reinforcement repair; rudder delamination

Shaft entrance seal

Also known as: stock entry seal; rudder shaft blade seal

Function or context: Seals the point where the stock enters the blade

AHI Marine services and repairs: rudder stock entry leak; seal failure; water ingress repair

Rudder blade water ingress

Also known as: waterlogged rudder; wet rudder; saturated core

Function or context: Water entering blade laminate or core through damage or failed sealing

AHI Marine services and repairs: water ingress test; waterlogged rudder assessment; rudder drying; rudder replacement

Rudder delamination

Also known as: blade delamination; laminate separation

Function or context: Separation between laminate layers or bonded blade sections

AHI Marine services and repairs: rudder delamination repair; laminate separation; structural rudder repair

Rudder split

Also known as: split rudder; split blade; separated rudder shell

Function or context: Structural separation of blade halves or bonded seams

AHI Marine services and repairs: split rudder repair; rudder shell rebonding; rudder replacement

Rudder stock

Rudder stock diameter

Also known as: shaft diameter; stock diameter; rudder shaft measurement

Function or context: Critical dimension for bearing fit, stock strength and component compatibility

AHI Marine services and repairs: rudder stock measurement; shaft diameter check; bearing fit assessment

Rudder stock taper or diameter step

Also known as: shaft shoulder; stepped rudder shaft; diameter transition

Function or context: Change in stock diameter along its length

AHI Marine services and repairs: shaft shoulder inspection; stock machining; bearing installation fit

Rudder stock keyway

Also known as: shaft keyway; tiller keyway; quadrant keyway

Function or context: Machined slot locating and transmitting torque to tiller head or quadrant

AHI Marine services and repairs: worn keyway; keyway damage; rudder stock repair; keyway machining

Rudder stock key

Also known as: shaft key; drive key; feather key

Function or context: Key engaging the keyway to prevent relative rotation

AHI Marine services and repairs: loose rudder key; damaged key; key replacement

Rudder stock corrosion

Also known as: shaft corrosion; rudder shaft corrosion; electrolysis damage

Function or context: Material loss or surface attack on the stock

AHI Marine services and repairs: rudder shaft corrosion inspection; corrosion repair; stock replacement

Aluminium rudder stock

Also known as: 6082 aluminium shaft; 7075 aluminium rudder stock

Function or context: Aluminium alloy stock used in some production and custom rudders

AHI Marine services and repairs: aluminium rudder stock inspection; aluminium shaft corrosion; replacement

Stainless steel rudder stock

Also known as: 316 stainless rudder shaft; 329 stainless; 630 stainless; 17-4PH

Function or context: Stainless alloy stock carrying rudder loads

AHI Marine services and repairs: stainless rudder shaft inspection; stainless stock corrosion; shaft replacement

Rudder stock bending

Also known as: bent rudder shaft; shaft deflection; rudder stock flex

Function or context: Elastic or permanent bending under steering and hydrodynamic loads

AHI Marine services and repairs: bent rudder stock assessment; shaft alignment; rudder stock replacement

Rudder stock vibration

Also known as: shaft vibration; rudder vibration; stock oscillation

Function or context: Dynamic vibration of the stock under load

AHI Marine services and repairs: rudder shaft vibration diagnosis; bearing alignment; stock inspection

Galvanic isolation

Also known as: electrical isolation; rudder shaft isolation

Function or context: Electrical separation of the rudder stock from other underwater metals

AHI Marine services and repairs: rudder electrolysis investigation; galvanic isolation; corrosion diagnosis

Electrochemical corrosion

Also known as: electrolysis; galvanic corrosion; underwater corrosion

Function or context: Corrosion caused by electrical connection between dissimilar metals in an electrolyte

AHI Marine services and repairs: rudder electrolysis repair; galvanic corrosion inspection; shaft replacement

Sacrificial anode

Also known as: rudder anode; zinc anode; aluminium anode

Function or context: Sacrificial metal protection for suitable underwater metal assemblies

AHI Marine services and repairs: rudder anode inspection; anode replacement; corrosion protection

Rudder bearings

Bottom rudder bearing

Also known as: lower rudder bearing; lower stock bearing

Function or context: Supports the lower section of the rudder stock

AHI Marine services and repairs: bottom rudder bearing service; bearing wear; bearing replacement

Top rudder bearing

Also known as: upper rudder bearing; upper stock bearing

Function or context: Supports and locates the upper section of the rudder stock

AHI Marine services and repairs: top rudder bearing service; upper bearing replacement; bearing play

Roller bearing

Also known as: rudder roller bearing; captive roller bearing

Function or context: Bearing using rollers between stock and bearing housing

AHI Marine services and repairs: rudder roller bearing service; roller replacement; bearing inspection

Bearing rollers

Also known as: rudder bearing balls; roller elements

Function or context: Rolling elements supporting smooth stock rotation

AHI Marine services and repairs: worn bearing rollers; flat-spotted rollers; roller replacement

Roller track

Also known as: bearing race; roller track; roller raceway

Function or context: Track supporting and locating the bearing rollers

AHI Marine services and repairs: roller track inspection; bearing track replacement; bearing overhaul

Delrin retaining ring

Also known as: bearing roller retainer; Delrin clip ring

Function or context: Retains the roller track and rollers in the bearing assembly

AHI Marine services and repairs: retaining ring replacement; bearing roller retention repair

Delrin bearing ring

Also known as: acetal ring; polymer bearing ring; glide ring

Function or context: Low-friction polymer ring used in bearing and locking arrangements

AHI Marine services and repairs: Delrin ring wear; polymer ring replacement; rudder bearing noise

PETP bearing

Also known as: PETP roller bearing; polymer bearing

Function or context: Polymer bearing construction used in several Jefa bearing types

AHI Marine services and repairs: PETP rudder bearing inspection; polymer bearing replacement

Self-aligning bearing

Also known as: self aligning rudder bearing; spherical bearing

Function or context: Bearing that accommodates stock deflection or angular misalignment

AHI Marine services and repairs: self-aligning rudder bearing; bearing alignment; bearing replacement

Conical self-aligning bearing

Also known as: conical rudder bearing; tapered self-aligning bearing

Function or context: Conical bearing arrangement accommodating angular movement

AHI Marine services and repairs: conical bearing inspection; bearing replacement; alignment diagnosis

Twin bearing assembly

Also known as: double rudder bearing; twin bearing; paired bearing

Function or context: Combined bearing arrangement for a particular rudder installation

AHI Marine services and repairs: twin rudder bearing service; bearing assembly replacement

Plain bearing

Also known as: gliding bearing; bush bearing; sleeve bearing

Function or context: Sliding-contact bearing supporting the rudder stock

AHI Marine services and repairs: plain rudder bearing wear; bush replacement; conversion to roller bearings

Bearing housing

Also known as: rudder bearing casing; bearing body

Function or context: Structural body locating bearing elements in the hull

AHI Marine services and repairs: bearing housing corrosion; housing damage; bearing replacement

Bearing flange

Also known as: rudder bearing flange; mounting flange

Function or context: Flanged interface securing bearing assembly to hull or structure

AHI Marine services and repairs: bearing flange inspection; loose flange; flange repair

Bearing alignment

Also known as: rudder bearing alignment; stock alignment

Function or context: Correct alignment of upper and lower bearing support

AHI Marine services and repairs: rudder bearing alignment; shaft binding; bearing installation correction

Bearing backlash

Also known as: rudder play; stock play; bearing clearance

Function or context: Unwanted movement between stock and bearing assembly

AHI Marine services and repairs: rudder bearing play; excessive rudder movement; bearing replacement

Bearing corrosion or deposits

Also known as: lime deposits; salt deposits; bearing contamination

Function or context: Deposits or corrosion that increase friction and steering resistance

AHI Marine services and repairs: stiff rudder diagnosis; bearing cleaning; corrosion removal; bearing service

Flat-spotted rollers

Also known as: flat rollers; damaged roller elements

Function or context: Rollers damaged by temporary blockage or contamination

AHI Marine services and repairs: rudder stiff spot; roller inspection; roller replacement

Plain-to-roller bearing conversion

Also known as: rudder bearing upgrade; bearing conversion

Function or context: Replacement of conventional sliding bearings with roller bearing assemblies

AHI Marine services and repairs: rudder bearing upgrade; plain bearing conversion; roller bearing retrofit

Replacement bearing balls

Also known as: JP3 bearing balls; Seaway bearing balls; Harken replacement bearing

Function or context: Replacement rolling elements for older bearing systems

AHI Marine services and repairs: replacement rudder bearing balls; legacy bearing repair; bearing retrofit

Rudder sealing

Rudder seal

Also known as: rudder shaft seal; rudder bearing seal; hull seal

Function or context: Prevents seawater entering the vessel around the rudder stock

AHI Marine services and repairs: rudder seal leak; rudder shaft seal replacement; water ingress repair

Rudder tube

Also known as: rudder stock tube; bearing connecting tube

Function or context: Tube enclosing the stock and helping create a watertight passage

AHI Marine services and repairs: rudder tube inspection; tube seal; rudder tube replacement

Rudder gaiter

Also known as: neoprene gaiter; rubber gaiter; rudder boot

Function or context: Flexible seal allowing stock rotation and bending while sealing the tube

AHI Marine services and repairs: rudder gaiter replacement; torn gaiter; leaking rudder seal

Neoprene gaiter

Also known as: neoprene boot; flexible rudder seal

Function or context: Flexible elastomer sealing component

AHI Marine services and repairs: neoprene gaiter inspection; gaiter crack repair; gaiter replacement

Jubilee clips

Also known as: hose clamps; stainless gaiter clamps; worm-drive clamps

Function or context: Clamps securing gaiter to rudder tube and stock

AHI Marine services and repairs: gaiter clamp corrosion; loose clamp; clamp replacement

Lip seal

Also known as: rudder shaft lip seal; rotary shaft seal

Function or context: Dynamic seal contacting a smooth shaft surface

AHI Marine services and repairs: rudder lip seal replacement; leaking shaft seal; seal inspection

PUR lip seal

Also known as: polyurethane rudder seal; PUR seal

Function or context: Polyurethane seal designed for rudder shaft sealing

AHI Marine services and repairs: PUR seal replacement; rudder seal service; seal porosity inspection

O-ring seal

Also known as: rudder O-ring; shaft O-ring

Function or context: Static or dynamic elastomer ring seal

AHI Marine services and repairs: rudder O-ring leak; seal design assessment; O-ring replacement

Stuffing box

Also known as: rudder stuffing box; packed gland; packing gland

Function or context: Traditional packed seal around a rotating shaft

AHI Marine services and repairs: rudder stuffing box leak; packing replacement; gland adjustment

Packing cord

Also known as: gland packing; stuffing box packing

Function or context: Compressible material used to seal a stuffing box

AHI Marine services and repairs: rudder packing cord replacement; gland leak repair

Seal contact surface

Also known as: shaft sealing land; polished shaft surface

Function or context: Smooth shaft area where lip seal runs

AHI Marine services and repairs: rudder shaft polishing; seal surface wear; leak diagnosis

Rudder waterline entry height

Also known as: seal entry level; rudder tube height

Function or context: Height of the hull water-entry point relative to the waterline

AHI Marine services and repairs: rudder tube water ingress; seal installation assessment

Twin-rudder seal loading

Also known as: dual rudder seal pressure; catamaran rudder seal

Function or context: Higher immersion and water pressure effects on one rudder when a twin-rudder vessel heels

AHI Marine services and repairs: twin rudder seal inspection; catamaran rudder water ingress; seal replacement

Rudder retention

Rudder locking ring

Also known as: rudder stock lock ring; shaft retaining collar

Function or context: Prevents rudder stock sliding vertically out of the vessel

AHI Marine services and repairs: rudder locking ring inspection; loose lock ring; retaining ring replacement

Lock ring set screw

Also known as: locking grub screw; cup point set screw

Function or context: Clamps locking ring to rudder stock

AHI Marine services and repairs: loose set screw; locking screw replacement; stock retention check

Vertical locking system

Also known as: rudder vertical retention; stock retention

Function or context: Arrangement preventing axial movement of the rudder stock

AHI Marine services and repairs: rudder lifting; vertical play; retention system inspection

Delrin thrust washer

Also known as: thrust washer; glide washer; polymer washer

Function or context: Provides a low-friction bearing surface between locking ring and bearing

AHI Marine services and repairs: thrust washer wear; washer replacement; rudder squeak diagnosis

Ball-track washer

Also known as: Delrin ball washer; thrust bearing washer

Function or context: Washer with ball track for smoother vertical locking rotation

AHI Marine services and repairs: ball track washer replacement; vertical bearing service

Delrin ball

Also known as: polymer ball; thrust washer ball

Function or context: Rolling element in the ball-track washer

AHI Marine services and repairs: worn Delrin balls; thrust washer service

Deck cover

Also known as: emergency tiller access cover; rudder stock cover

Function or context: Removable deck fitting providing access to emergency tiller connection

AHI Marine services and repairs: deck cover replacement; emergency tiller access repair

Deck cover flange

Also known as: access cover flange; deck plate flange

Function or context: Flanged part of the deck cover assembly

AHI Marine services and repairs: deck flange damage; cover fitting replacement

Emergency tiller access

Also known as: emergency tiller port; rudder stock access

Function or context: Deck opening allowing access to emergency steering connection

AHI Marine services and repairs: emergency tiller access inspection; deck access cover service

Rudder connection

Tiller head

Also known as: rudder tiller head; tiller clamp; tiller stock head

Function or context: Clamps the tiller to the top of the rudder stock

AHI Marine services and repairs: tiller head inspection; loose tiller head; tiller head replacement

Tiller arm

Also known as: rudder tiller; tiller lever

Function or context: Manual lever transmitting force to rudder stock

AHI Marine services and repairs: tiller arm repair; tiller fitting replacement; loose tiller diagnosis

GRP tiller

Also known as: fibreglass tiller; composite tiller arm

Function or context: Lightweight composite tiller arm

AHI Marine services and repairs: GRP tiller repair; tiller replacement; tiller fitting inspection

Tiller U-profile

Also known as: stainless tiller channel; U-shaped tiller fitting

Function or context: Stainless profile in the tiller head that accepts the tiller arm

AHI Marine services and repairs: tiller U-profile corrosion; tiller fitting repair; replacement

Tiller head set screws

Also known as: tiller grub screws; adjustment screws

Function or context: Fasteners used to secure or adjust tiller position and angle

AHI Marine services and repairs: tiller set screw replacement; loose tiller adjustment

Rudder quadrant

Also known as: steering quadrant; rudder quadrant clamp

Function or context: Lever or quadrant attached to stock to receive steering linkage

AHI Marine services and repairs: rudder quadrant inspection; quadrant movement; quadrant replacement

Quadrant keyway connection

Also known as: quadrant key; stock keyway; keyed quadrant

Function or context: Torque-transmitting connection between quadrant and stock

AHI Marine services and repairs: quadrant slipping; worn keyway; quadrant connection repair

Emergency tiller

Also known as: spare tiller; emergency rudder tiller

Function or context: Manual backup steering lever fitted to the rudder stock

AHI Marine services and repairs: emergency tiller inspection; emergency tiller replacement; backup steering repair

Emergency tiller socket

Also known as: stock top socket; emergency tiller hole

Function or context: Socket or opening in the top of the stock accepting emergency tiller

AHI Marine services and repairs: emergency tiller socket damage; stock top connection repair

Emergency tiller connection

Also known as: type 1 emergency tiller; type 2 emergency tiller

Function or context: Rudder stock top configuration used to connect backup tiller

AHI Marine services and repairs: emergency tiller compatibility; connection inspection; replacement

Integral rudder stops

Also known as: tiller head stops; rudder travel stops

Function or context: Stops limiting rudder rotation at designed angles

AHI Marine services and repairs: rudder stop inspection; stop adjustment; damaged stop replacement

Rudder installation

Rudder tube housing

Also known as: bearing tube; rudder tube structure

Function or context: Structural passage and support arrangement around the stock

AHI Marine services and repairs: rudder tube inspection; tube repair; water ingress assessment

Top bearing mounting

Also known as: upper bearing mount; deck bearing support

Function or context: Mounting interface for upper bearing

AHI Marine services and repairs: top bearing mounting repair; loose bearing support; reinforcement

Bottom bearing mounting

Also known as: lower bearing mount; hull bearing seat

Function or context: Mounting interface for lower bearing

AHI Marine services and repairs: bottom bearing seat repair; bearing housing movement; structural inspection

Bearing bonding

Also known as: bearing bedding; bonded bearing housing

Function or context: Bonded installation of bearing or tube components to hull structure

AHI Marine services and repairs: rudder bearing rebedding; bearing bond failure; hull interface repair

GRP hull bearing installation

Also known as: fibreglass hull rudder bearing; composite hull bearing

Function or context: Rudder bearing installation in GRP or wood-core structures

AHI Marine services and repairs: GRP rudder bearing repair; core moisture inspection; bearing replacement

Aluminium hull bearing installation

Also known as: aluminium boat rudder bearing; metal hull bearing

Function or context: Rudder bearing installation in aluminium structure

AHI Marine services and repairs: aluminium hull bearing repair; electrical isolation; corrosion inspection

Steel hull bearing installation

Also known as: steel boat rudder bearing; steel hull rudder tube

Function or context: Rudder bearing installation in steel structure

AHI Marine services and repairs: steel hull rudder bearing repair; corrosion isolation; bearing replacement

Wood-core hull sealing

Also known as: cored hull rudder installation; core sealing

Function or context: Protection of hull core around rudder bearing penetrations

AHI Marine services and repairs: rudder penetration water ingress; core sealing repair; bearing rebedding

Rudder bearing seat

Also known as: bearing recess; bearing socket; hull bearing seat

Function or context: Machined or moulded location accepting bearing assembly

AHI Marine services and repairs: bearing seat wear; damaged bearing recess; seat repair

Rudder clearance

Also known as: blade-to-hull clearance; rudder gap

Function or context: Clearance between blade, hull and surrounding structure

AHI Marine services and repairs: rudder clearance check; blade contact; alignment inspection

Rudder drop and refit

Also known as: rudder removal; rudder drop; rudder reinstall

Function or context: Removal and reinstallation required for many bearing and stock repairs

AHI Marine services and repairs: rudder removal and refit; rudder drop; bearing access; rudder installation

Rudder condition

Rudder stiffness

Also known as: stiff rudder; heavy steering; tight rudder

Function or context: Increased resistance when rotating rudder

AHI Marine services and repairs: stiff rudder diagnosis; bearing cleaning; seal friction; rudder service

Irregular rudder rotation

Also known as: rough rudder movement; intermittent stiffness; notchy steering

Function or context: Uneven or interrupted rotation of the stock

AHI Marine services and repairs: rudder rotation inspection; damaged rollers; bearing fault diagnosis

Rudder backlash

Also known as: rudder stock play; rudder movement; excessive rudder play

Function or context: Unwanted movement between rudder stock and supporting components

AHI Marine services and repairs: rudder backlash diagnosis; bearing wear; stock connection inspection

Rudder vibration

Also known as: rudder oscillation; stock vibration; steering vibration

Function or context: Vibration caused by dynamic loads, stock flex or bearing issues

AHI Marine services and repairs: rudder vibration diagnosis; stock alignment; bearing inspection

Rudder impact damage

Also known as: grounding damage; underwater impact; collision damage

Function or context: Damage caused by contact with seabed, debris or objects

AHI Marine services and repairs: rudder impact inspection; grounding damage repair; rudder replacement

Rudder structural inspection

Also known as: rudder survey; rudder condition assessment; rudder inspection

Function or context: Assessment of blade, stock, bearings, seals and attachments

AHI Marine services and repairs: rudder inspection; pre-purchase rudder survey; structural assessment

Rudder maintenance

Bottom bearing flushing

Also known as: bearing hose down; salt removal; bearing rinse

Function or context: Rinsing deposits and salt from lower bearing housing

AHI Marine services and repairs: rudder bearing cleaning; salt crystallisation removal; annual haul-out service

Bearing roller replacement

Also known as: rudder roller change; bearing roller kit

Function or context: Replacement of damaged or worn rollers in a serviceable bearing

AHI Marine services and repairs: rudder bearing roller replacement; bearing rebuild; roller kit installation

Bearing cleaning

Also known as: rudder bearing service; bearing contamination removal

Function or context: Cleaning bearing elements and housing to restore smooth movement

AHI Marine services and repairs: rudder bearing service; bearing cleaning; stiff rudder repair

Lip seal inspection

Also known as: rudder seal inspection; seal porosity check

Function or context: Inspection for cracking, porosity and deterioration

AHI Marine services and repairs: rudder seal inspection; lip seal replacement; water leak prevention

Gaiter inspection

Also known as: rudder boot inspection; neoprene seal inspection

Function or context: Inspection of gaiter surface, cracks and clamp areas

AHI Marine services and repairs: rudder gaiter inspection; cracked gaiter replacement; leak prevention

Rudder stock electrolysis inspection

Also known as: rudder shaft annual inspection; circular corrosion marks

Function or context: Annual check for corrosion patterns and material loss

AHI Marine services and repairs: rudder shaft corrosion inspection; electrolysis testing; stock condition report

Tiller or quadrant movement check

Also known as: tiller head movement; quadrant movement; stock connection check

Function or context: Check for movement between stock and attached tiller or quadrant

AHI Marine services and repairs: tiller connection inspection; quadrant movement diagnosis; keyway wear check

Rudder materials

Anodised aluminium 6082

Also known as: AlMgSi1; marine aluminium 6082

Function or context: Seawater-resistant aluminium used in stock fittings and accessories

AHI Marine services and repairs: aluminium rudder component corrosion; fitting replacement

Stainless steel 316

Also known as: AISI 316; 1.4401 stainless

Function or context: Stainless alloy used in shafts, sleeves and tiller fittings

AHI Marine services and repairs: 316 stainless rudder shaft; stainless fitting corrosion; replacement

Stainless steel 329

Also known as: AISI 329; duplex stainless steel

Function or context: Stainless alloy option for rudder stocks

AHI Marine services and repairs: duplex rudder stock; stainless shaft inspection; replacement

Stainless steel 630

Also known as: AISI 630; 17-4PH; precipitation hardening stainless

Function or context: High-strength stainless alloy option for rudder stocks

AHI Marine services and repairs: high-strength rudder shaft; stock replacement; shaft material assessment

Carbon rudder stock

Also known as: carbon fibre rudder shaft; composite stock

Function or context: Composite stock requiring a suitable precision bearing running surface

AHI Marine services and repairs: carbon rudder stock sleeve; bearing compatibility; sleeve bonding

Stainless steel sleeve

Also known as: rudder shaft sleeve; stainless bearing sleeve

Function or context: Precision sleeve creating a suitable running surface on a stock

AHI Marine services and repairs: rudder stock sleeve replacement; shaft surface restoration; seal surface repair

Aluminium sleeve

Also known as: aluminium rudder sleeve; bearing conversion sleeve

Function or context: Machined sleeve fitted to stock for bearing surface or conversion

AHI Marine services and repairs: rudder sleeve installation; bearing conversion; shaft repair

Epoxy bonded sleeve

Also known as: bonded shaft sleeve; epoxy sleeve installation

Function or context: Sleeve bonded to stock to provide a controlled bearing or seal surface

AHI Marine services and repairs: rudder sleeve bonding repair; shaft surface restoration

Rudder system types

Single-rudder system

Also known as: single rudder yacht; mono rudder

Function or context: Vessel arrangement with one rudder blade and stock

AHI Marine services and repairs: single rudder service; rudder bearing repair; stock inspection

Twin-rudder system

Also known as: dual rudder; twin rudder yacht

Function or context: Vessel arrangement with two rudders and associated bearings and seals

AHI Marine services and repairs: twin rudder service; dual rudder bearing replacement; seal inspection

Catamaran rudder system

Also known as: catamaran rudders; twin rudder catamaran

Function or context: Twin-rudder arrangement common to multihull vessels

AHI Marine services and repairs: catamaran rudder repair; catamaran rudder bearing service; rudder replacement

Wheel-steered rudder

Also known as: wheel steering rudder stock; quadrant rudder system

Function or context: Rudder stock arrangement connected to wheel steering and quadrant

AHI Marine services and repairs: wheel-steered rudder service; quadrant connection repair; bearing replacement

Tiller-steered rudder

Also known as: tiller steering rudder; tiller stock

Function or context: Rudder stock arrangement with tiller mounted at the upper end

AHI Marine services and repairs: tiller-steered rudder service; tiller head repair; top bearing replacement

Emergency steering arrangement

Also known as: backup rudder control; emergency tiller system

Function or context: Backup manual means of controlling the rudder if primary steering fails

AHI Marine services and repairs: emergency tiller inspection; emergency steering repair; backup steering check

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