Affected Vehicles
Mercedes Benz
W204, W212, W172, W906, W639, W166 in common, various other models with OM651 fitted OM651 2009 -2016
Symptoms
- Coolant loss from inlet manifold area
Possible Causes


- Connection outlet incorporating fuel filter housing warps due to heat soak. New modified housing kit available.
Repair Steps
- Drain cooling system.
- Remove EGR cooler to gain correct access to housing. Do not open the fuel system if possible, as there are known instances of air locks after repair which prevents start-up. If the fuel filter is removed/replaced, make sure to carry out fuel system activation of low-pressure pump before attempting to crank the engine.
- Remove old housing
- Always ensure cleanliness when doing repair
- Replace fuel filter housing. Tighten the bolt in sequence:
- Tighten the two bolts for the two-hole flange on the cylinder head, first to 10Nm
- Tighten the three bolts for mounting on to the inlet manifold 8.5Nm
Parts Required - EPC part number location (Check according to VIN for correct part number)
- A651 200 39 00 Repair kit.
- A651 142 24 80 Metal gasket for EGR cooler.
Special tools Required:
Coolant receptacle
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