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Diesel in engine oil

W

wideload

Member
73
1
6
Location
Stockport, UK
My M35 engine sump has started to top up with fuel. Oil level is increasing on the stick and oil is looking very thin. At the end of the last 35 mile run out the oil pressure dropped to 15 psi at idle...it has never ever dropped this low before. Any ideas where it may be leaking from to get into the oil ?
 
wsucougarx

wsucougarx

Well-known member
6,951
65
48
Location
Washington State
Fuel Density Compensator. It's part of your injection pump. This is one of the couple notorious sights prone to adding diesel to your crankcase
 
W

wideload

Member
73
1
6
Location
Stockport, UK
So the part of the pump which varies the rate of injection for the type of fuel you are using ? I am running fresh pump diesel all the time, if it is this device causing the problem how do I "disconnect it" ?
 
mhassett

mhassett

Member
588
11
18
Location
Bush, LA
FDC is the only place where you have fuel on one side or an o-ring and lube oil on the other.
By-pass FDC and problem will go away and truck will run better.
 
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