Wärtsilä W46 Spare Parts List & Maintenance Guide: Complete Reference for 46-Series Engines

The Wärtsilä 46 series is one of the most successful medium-speed marine diesel engine families ever produced, with thousands of installations worldwide in container vessels, tankers, bulk carriers, cruise ships, LNG carriers, and power plants. With a 460mm bore and power outputs from 5,850 to 16,800 kW, the W46 delivers exceptional fuel efficiency and reliability in both propulsion and generator applications.

### Connecting Rod, Crankshaft & Bearings - Connecting rod assembly (marine head type for some configurations) - Connecting rod bearing shells — upper and lower (trimetal copper-lead-tin) - Connecting rod bolts — hydraulically tensioned (stretch bolts — replace at each overhaul) - Main bearing shells — upper and lower (trimetal) - Thrust bearing pads — active and inactive sides - Crankpin bearing shells - Crankshaft deflection gauge (for alignment measurements) ### Fuel Injection System - Fuel injector complete — multi-hole nozzle, high-pressure (typically 2 per cylinder) - Fuel injection pump — individual pump per cylinder - Injection pump plunger and barrel - Delivery valve and spring - High-pressure fuel pipe (injection pipe) - Fuel pump rack assembly and linkage - Fuel cam follower (roller tappet) - Fuel pump drive gear - Governor (electronic — Woodward or equivalent) ### Turbocharger (typically ABB A100-L or TPL series) - Turbocharger rotor assembly (cartridge/CHRA) - Compressor wheel - Turbine wheel (Inconel) - Journal bearing set - Thrust bearing assembly - Labyrinth seal set - Nozzle ring (adjustable on some variants) - Turbo intake silencer/filter - Turbo gasket and O-ring kit - Turbo oil supply and drain pipe gaskets

### Cooling, Lubrication & Auxiliary Systems - HT cooling water pump (engine-driven centrifugal) - LT cooling water pump - HT/LT thermostat valve assembly - Lube oil pump (engine-driven gear type) - Pre-lube oil pump (electric, for pre/post lubrication) - Lube oil cooler element (plate type) - Lube oil automatic backflush filter - Lube oil centrifugal separator (if fitted) - Piston cooling oil module - Charge air cooler (aftercooler) — HT and LT stages - Cylinder liner cooling water jacket seals - Expansion tank float valve ### Exhaust System - Exhaust manifold sections (water-cooled or insulated) - Exhaust bellows (compensators) - Exhaust manifold gaskets - Turbocharger exhaust inlet gasket - Exhaust gas economiser cleaning system components (if fitted) ### Starting System - Starting air valve per cylinder - Starting air distributor (pilot valve) - Main starting air valve - Turning gear mechanism - Barring gear motor