Marine Parts & Spares

injector component · Fuel injection system

OEM fuel injector nozzle for the MAN B&W G90ME-GI-S main engine. Precision-machined to maintain fuel spray pattern and injection timing within manufacturer tolerances. Replace at the specified service interval or on evidence of wear.

Service interval: 12,000 h

cylinder component · Cylinder block / combustion chamber

Replaceable cast-iron liner forming the cylindrical wall of the combustion chamber in a two-stroke low-speed engine. It is honed to a precise finish to retain the piston rings and is water-jacketed for cooling. Liner wear (measured by templug and bore-gauge) sets the top-overhaul and decarbonisation schedule.

Service interval: 80,000 h

piston component · Piston assembly

A set of compression and scraper rings fitted to the piston that seal the combustion chamber and regulate lubricating-oil film on the liner. Ringgroove and ring wear directly affects blow-by, lube-oil consumption and cylinder pressure; replacement normally coincides with top overhaul.

Service interval: 16,000 h

bearing · Connecting rod / crosshead

Thin-wall bimetal or trimetal bearing shell at the connecting-rod small end / crosshead that carries the high load between piston and crank train. Monitored through lube-oil pressure, temperature and bearing-metal temperature; failure risks crankcase explosion and major mechanical damage.

bearing · Bedplate / crankshaft journal

Split bearing shells supporting the crankshaft in the bedplate. Condition is tracked via crankshaft deflection readings, lube-oil analysis for white-metal content and bearing temperature. Excessive wear causes journal damage and loss of oil-film thickness.

turbocharger component · Exhaust-gas turbocharger

The rotating assembly (turbine wheel, compressor wheel and shaft) of the engine's exhaust-gas turbocharger. Surge, vibration, rotor imbalance and blade fouling are tracked at service intervals; overhaul includes balancing, nozzle-ring cleaning and bearing renewal.

Service interval: 24,000 h

injector component · Fuel injection system / cylinder cover

Atomises and times the delivery of fuel into the combustion chamber. Spray pattern, nozzle lift and opening pressure directly govern combustion quality, exhaust smoke and thermal load. Regular overhaul (nozzle testing, tip renewal) is essential for consistent performance.

Service interval: 8,000 h

valve · Air starting system / cylinder cover

A timed, cam- or electronically-controlled valve that admits high-pressure starting air to each cylinder in firing order to crank the main engine. Leaky valves can cause air-line explosions; testing and overhaul are part of routine slow-turn and start trials.

Service interval: 16,000 h

valve · Cylinder cover

A spring-loaded relief valve on each cylinder cover that opens at a set pressure to protect the engine from abnormal combustion pressure (a statutory requirement under classification rules). Set pressure and seat tightness are verified at each annual survey.

valve · Cylinder cover / exhaust system

The hydraulically operated poppet valve that opens to release exhaust gas at the end of the power stroke. Seat burning, spindle-neck cracking and rotation mechanism failure are common defects; reconditioning restores seating and rotation for efficient gas exchange.

Service interval: 16,000 h

filter · Lubricating-oil system

The replaceable element of the main lubricating-oil filter, which removes wear particles and soot from circulating oil. Differential pressure across the filter and oil analysis govern change-out; clean oil is critical for bearing and turbocharger life.

Service interval: 4,000 h

separator component · Fuel and lube-oil purifier

The high-speed rotating bowl assembly of a fuel or lube-oil purifier that separates water and sludge from the oil by centrifugal force. Periodic overhaul includes cleaning the disc stack, renewing O-rings and verifying bowl balance and the water-sensing function.

Service interval: 4,000 h

stern tube · Stern tube / shaft line

The water- or oil-lubricated bearing that supports the propeller shaft where it exits the hull. Condition is tracked through bearing temperature and wear-down readings; failure risks shaft misalignment, oil pollution (oil-lubricated types) and the need for dry-dock renewal.

pump component · Cooling-water (fresh water) system

The rotating impeller of the main engine or auxiliary fresh-water cooling pump. Cavitation, erosion and bearing wear reduce cooling flow and cause jacket-water temperature alarms; impeller and seal renewal is a standard planned-maintenance task.

Service interval: 12,000 h