Fuel Injector Copper Washer Leakage Black Death
SeriousEngineThe Mercedes-Benz-derived 2.7-litre five-cylinder OM612 common-rail diesel engine suffers from combustion gas blow-by past fatigued copper injector seal washers. Escaping diesel combustion gasses bake into a rock-hard black carbon crust around the cylinder head and injector bodies. If left unchecked, the injectors seize into the aluminium head, leading to misfires, diesel fumes in the cabin, and multi-thousand-pound extraction bills.
Pungent diesel exhaust or burning fuel smell permeating the passenger cabin, Rhythmic chuffing or puffing sound from the top of the engine during idle, Hard, tar-like black carbon deposits accumulated around the fuel injector bases
- Unclip the plastic acoustic engine cover and inspect the injector wells with a torch
- Listen for an audible chuffing noise around the rocker cover while the engine is idling
- Check service invoices to see if copper washers have ever been replaced or injectors re-seated