Quote:
Originally Posted by jhunt253
thanks for your help. i have removed the lift pump and changed the o rings, i have my doubts whether that is it, the o rings i removed looked ok. is there any other place i should check before i put this back together? can it be leaking by the ip?
thanks, hunt
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The Elements in the Fuel Injection Pump are lubricated by Diesel Fuel so a tiny bit of Diesel Fuel is always getting into everyone’s Oil.
With long use (worn out) and/or dirt scoring up the Plungers and Barrels of the Elements they can leak more.
A more unusual circumstance is if for some reason the Elements barrel is not seated in the Fuel Injection Pump Housing well were the metal to metal contact is. (Or a crack or porosity in the Fuel Injection Pump Housing.)
Checking the max torque on the Delivery Valve Holders on the M type Fuel Injection Pumps might show if any of the Elements are loose.
Other than that there is no easy way to tell.
Worn or scored Elements in a Fuel Injection Pump often cause hard starting when the Engine is hot.
When running a Fuel Injection Pump on the Test Stand and it has a removable cover and the leak is really bad you some times can see the leak if it is large enough to form a drop. But, this is not helpful if the IP is on the Vehicle.
On the 617s the only other way Fuel can get into the Engine Oil is an Injector that is not atomizing the Fuel or if there is not enough heat or compression to ignite the atomized Fuel.