Fuel Injector Repairs
Mercedes Fuel Injector Repairs are something we perform every day for our customers.
Leaking fuel injectors is one of the most common problems on Mercedes diesel engines. There are two types of fuel injector leaks on a Mercedes diesel engine and we can repair both easily.
'Black Death'
The usual type of fuel injector leak is commonly referred to as ‘Black Death’. It refers to the messy carbon buildup that fills the space around the fuel injectors, pipes and wiring. It’s caused by erosion of the tiny copper washers that seal the fuel injectors to the cylinder head. Partially combusted diesel fuel escapes from inside the combustion chamber and sticks to the top of the engine as a black carbon substance.
Affected Models
Pre-2006 Sprinters and Vitos are the most susceptible to fuel injector leaks. But it can affect all models of Mercedes Diesel engines. Of the newer engine variants, injector leaks are often seen on the OM642 V6 engine.
Symptoms and signs of Black Death
- Exhaust Smells in the cabin or air conditioning
- Chuffing or compressed air noise
- Carbon deposits on the engine or underside of bonnet
- Poor fuel consumption
The Mercedes Fuel Injector Repair Process
The Mercedes fuel injector repair process requires special tools for removing the fuel injectors and grinding the sealing surfaces. The good news is that the fuel injectors can usually be salvaged and reused. This reduces cost compared to replacement of the fuel injectors.
- Remove un combusted material using special tools and chemicals.
- Remove injectors using specialist pullers, including hydraulic for very severe cases.
- Clean and inspect fuel injectors for damage.
- Replace injector sealing seat if required.
- Machine cylinder head injector sealing surface.
- Replace injectors using correctly measured sealing washers and hold down bolts to manufacturers torque specifications.
- Repair or replace injector fuel leak off rail as required.
- Leak test reinstalled injectors.
The Other Type of Injector Leak - Fuel Leaks
Diesel fuel leaks can also occur. Unlike the Black Death problem, there will be no carbon but rather a messy diesel leak. It will usually drain towards the rear of the engine and then down to the road. So it’s important to get this fixed urgently if you notice diesel fuel dripping. Diesel leaks can come from the following areas:
- Fuel Leak Back or Return Line Hose
- Injector High Pressure Steel Pipes
- Cracked Fuel Injector Body
Repairing Diesel Fuel Leaks
Diesel fuel leaks can be repaired by replacing the faulty or cracked part. Contact us today through our online booking enquiry form or by phone if you’re experiencing any of these problems and we’ll be glad to assist.
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