Boat Engine Service & Repair

Engine assembly

Marine diesel engine

Also known as: marine diesel engine; inboard diesel engine; yacht diesel engine; marine engine servicing

Function or context: Primary propulsion machinery converting fuel energy into mechanical power for the vessel.

AHI Marine services and repairs: marine diesel engine servicing; inboard engine maintenance; marine engine diagnostics; engine repair; engine replacement; engine repowering

Inboard petrol engine

Also known as: inboard petrol engine; marine petrol engine; V8 marine engine; petrol inboard servicing

Function or context: Spark-ignition engine installed within the vessel and connected to its propulsion system.

AHI Marine services and repairs: inboard petrol engine servicing; V8 marine engine maintenance; petrol engine diagnostics; engine repair

Engine condition assessment

Also known as: marine engine inspection; engine condition check; engine mechanical assessment

Function or context: Assessment of the engine's operating condition, wear, performance and service requirements.

AHI Marine services and repairs: marine engine condition assessment; engine inspection; engine diagnostics; pre-purchase engine assessment

Engine block

Also known as: marine engine block; diesel engine block; engine casing

Function or context: Main structural body housing the engine cylinders, crankshaft and internal components.

AHI Marine services and repairs: engine block inspection; engine block repair; engine overhaul; engine reconditioning

Cylinder head

Also known as: marine diesel cylinder head; engine head reconditioning; cylinder head repair

Function or context: Closes the top of the cylinders and houses valves, ports and combustion spaces.

AHI Marine services and repairs: marine cylinder head reconditioning; cylinder head repair; cylinder head inspection; engine overhaul

Engine valves

Also known as: diesel engine valves; inlet valves; exhaust valves; valve seats

Function or context: Control the intake of air and discharge of exhaust gases from each cylinder.

AHI Marine services and repairs: marine engine valve reconditioning; valve seat repair; valve inspection; valve replacement

Timing belt

Also known as: marine diesel timing belt; engine timing belt replacement; timing components

Function or context: Synchronises crankshaft and camshaft rotation to maintain correct valve timing.

AHI Marine services and repairs: marine engine timing belt replacement; timing belt inspection; engine timing service

Engine mounts

Also known as: marine engine mounts; diesel engine mounts; engine vibration; engine alignment

Function or context: Support the engine, isolate vibration and maintain alignment with the drivetrain.

AHI Marine services and repairs: marine engine mount inspection; engine mount replacement; engine vibration diagnosis; engine alignment

Engine mounting brackets and fasteners

Also known as: engine brackets; engine mount brackets; mounting bolts

Function or context: Secure engine mounts to the engine bed and vessel structure.

AHI Marine services and repairs: engine mounting inspection; bracket repair; mounting fastener replacement; engine alignment

Cylinder compression

Also known as: marine diesel compression test; engine compression testing; compression test

Function or context: Measures cylinder sealing and provides an indication of internal engine condition.

AHI Marine services and repairs: marine engine compression testing; diesel compression diagnosis; engine condition testing

Fuel system

Fuel injectors

Also known as: marine diesel injectors; fuel injector testing; injector servicing; injector removal

Function or context: Meter and atomise fuel into the engine cylinders at the required pressure and timing.

AHI Marine services and repairs: marine fuel injector servicing; injector removal and testing; injector reconditioning; injector replacement

Fuel injection pump

Also known as: diesel injection pump; fuel injection system; injector pump

Function or context: Delivers fuel to the injectors at the required pressure and timing.

AHI Marine services and repairs: marine diesel injection pump diagnostics; fuel pump servicing; injection system repair

Fuel filters

Also known as: marine fuel filters; diesel fuel filter replacement; primary fuel filter

Function or context: Remove contaminants from fuel before it reaches the injection system.

AHI Marine services and repairs: marine engine fuel filter servicing; diesel filter replacement; fuel system maintenance

Racor fuel filters and water separators

Also known as: Racor filter; marine diesel water separator; fuel water separator

Function or context: Separate water and particulate contamination from diesel fuel.

AHI Marine services and repairs: Racor filter servicing; fuel water separator maintenance; water-in-fuel diagnosis; filter replacement

Fuel lines and hoses

Also known as: marine fuel hose; diesel fuel lines; fuel supply hose

Function or context: Carry fuel between the tank, filters, lift pump and injection equipment.

AHI Marine services and repairs: marine fuel hose inspection; fuel line replacement; fuel leak diagnosis; fuel system repair

Fuel lift pump and priming system

Also known as: diesel lift pump; fuel priming pump; engine fuel primer

Function or context: Supplies fuel to the injection system and allows air to be removed from the fuel circuit.

AHI Marine services and repairs: marine fuel pump servicing; fuel priming fault diagnosis; diesel starting problem repair

Fuel contamination and water in fuel

Also known as: water in diesel fuel; contaminated marine fuel; diesel fuel system bleeding

Function or context: Fuel condition issues that can restrict supply, damage injection components or cause starting problems.

AHI Marine services and repairs: marine diesel water-in-fuel diagnosis; fuel contamination removal; fuel system flushing; fuel system bleeding

Lubrication system

Engine oil

Also known as: marine engine oil; diesel engine oil; engine oil change; lubrication service

Function or context: Lubricates internal moving parts, reduces friction and helps remove heat and contaminants.

AHI Marine services and repairs: marine engine oil change; diesel engine lubrication service; oil level checks; oil leak diagnosis

Engine oil filters

Also known as: marine oil filter; diesel oil filter; engine filter replacement

Function or context: Remove particles and contaminants from circulating engine oil.

AHI Marine services and repairs: marine engine oil filter replacement; engine filter servicing; scheduled engine maintenance

Engine oil sampling and analysis

Also known as: marine engine oil analysis; diesel oil sample; lubricant condition analysis

Function or context: Tests oil condition and may help identify wear, contamination or maintenance concerns.

AHI Marine services and repairs: marine engine oil sampling; diesel oil analysis; engine condition monitoring

Oil sump and dipstick

Also known as: engine sump; oil pan; marine engine dipstick; oil level check

Function or context: Stores engine lubricating oil and provides a means of checking its level.

AHI Marine services and repairs: engine oil level inspection; sump leak diagnosis; dipstick replacement; oil level fault diagnosis

Cooling system

Coolant pump

Also known as: marine coolant pump; engine water pump; freshwater circulation pump

Function or context: Circulates coolant through the engine block and cylinder head.

AHI Marine services and repairs: marine coolant pump servicing; engine water pump repair; coolant leak diagnosis; pump replacement

Coolant overflow reservoir

Also known as: coolant overflow tank; expansion tank; coolant recovery bottle

Function or context: Receives and stores expanding coolant as engine temperature changes.

AHI Marine services and repairs: coolant reservoir installation; expansion tank replacement; coolant level and leak checks

Coolant hoses and connections

Also known as: marine coolant hose; engine cooling hoses; coolant pipework

Function or context: Carry coolant between the engine, pump, heat exchanger and reservoir.

AHI Marine services and repairs: coolant hose inspection; hose replacement; cooling system leak repair

Engine anodes

Also known as: marine engine anodes; heat exchanger zinc anodes; sacrificial anodes

Function or context: Protects metal components in the cooling circuit from galvanic corrosion.

AHI Marine services and repairs: marine engine anode replacement; heat exchanger anode servicing; cooling system corrosion protection

Starting and electrical system

Starter motor

Also known as: marine diesel starter motor; inboard engine starting motor; starter replacement

Function or context: Cranks the engine during the starting sequence.

AHI Marine services and repairs: marine starter motor testing; starter motor repair; starter replacement; engine starting diagnostics

Starting circuit and fuel-start system

Also known as: marine diesel starting system; hard starting; engine start fault

Function or context: Electrical and fuel-delivery components required to crank and start the engine.

AHI Marine services and repairs: marine engine starting diagnostics; hard-start fault finding; starting system repair

Alternator

Also known as: marine engine alternator; diesel alternator; engine charging system

Function or context: Converts engine mechanical power into electrical power to charge batteries and supply onboard loads.

AHI Marine services and repairs: marine alternator testing; alternator servicing; charging system diagnostics; alternator replacement

Engine warning lights and sensors

Also known as: marine engine warning light; engine alarm; engine sensor diagnostics

Function or context: Monitor engine operating conditions and alert the operator to faults or abnormal readings.

AHI Marine services and repairs: marine engine warning light diagnosis; sensor testing; engine alarm fault finding

Exhaust system

Exhaust pipework and through-hull outlet

Also known as: marine engine exhaust; through-hull exhaust; diesel exhaust pipe

Function or context: Carries exhaust gases from the engine and discharges them safely outside the vessel.

AHI Marine services and repairs: marine exhaust system inspection; exhaust pipe repair; through-hull exhaust fitting; exhaust replacement

Wet exhaust components

Also known as: marine wet exhaust; water-injected exhaust; exhaust mixing elbow

Function or context: Mixes cooling water with exhaust gases in wet-exhaust installations and routes discharge safely.

AHI Marine services and repairs: marine wet exhaust servicing; exhaust elbow inspection; corrosion and blockage diagnosis

Transmission and propulsion

Marine gearbox

Also known as: marine gearbox servicing; diesel engine gearbox; ZF gearbox

Function or context: Transfers engine torque to the propulsion system and provides gear selection and reduction.

AHI Marine services and repairs: marine gearbox servicing; gearbox condition assessment; gearbox repair; gearbox diagnostics

Gearbox shift mechanism

Also known as: electronic shift transmission; marine gear shift; transmission control

Function or context: Engages forward, neutral and reverse through mechanical or electronic controls.

AHI Marine services and repairs: marine gearbox shift diagnosis; electronic shift fault finding; transmission adjustment and repair

Drive leg

Also known as: marine drive leg; sterndrive leg; propulsion leg

Function or context: Transfers drive from the engine and transmission to the propeller in applicable installations.

AHI Marine services and repairs: marine drive leg inspection; drive leg servicing; drive leg fault diagnosis; replacement

Engine replacement and repowering

Also known as: marine engine repower; inboard diesel replacement; marine engine changeover

Function or context: Removal of an existing engine and installation of a replacement or upgraded propulsion engine.

AHI Marine services and repairs: marine engine replacement; marine engine repowering; engine removal and installation; commissioning

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