Oil Pump Shim

[Rawze]

(08-20-2018 )Meatbag Wrote:  How long has yours lasted? I read the whole thread, didnt see any mileage reports from any of you 7-10 dimers. My mechanic (lost access to my shop/tools) is dead set against it, says it's going to wear out everything. I am going through with this project in the next few days whether he likes it or not. Motor is at 760k, pressure is ok but it's a peace of mind thing. How many miles since you did your oil pump shim?

I have yet to see anyone with any kind of accelerated wear by doing this. Personally I recommend using 6 dimes instead of 8 on anything newer than a CM871 because there is only one overhead cam. I know some guys who did it more than 5 years ago now. Your mechanic needs get his head out of the sand and see the light. I bet he is also against setting liner height to 0.014", using a gallon of gear lube at every oil change and all the other other things proven to be established benefits too.

the oil pressure measured at the rockers is only 9 psi with factory pump pressure. It increases to 11-12 psi with the shimms. - Someone called up cummins engineering about 3 years ago on just this subject and asked them about sustainable oil pressures and they said everything in the engine including filters was rated for at least 60 PSI. Don't know if i would go that high, maybe shortened gasket life on the flywheel housing and front cover,.. but I know lots of guys who have theirs set at 45-50 without issue.

Your paying him,.. not the other way around. Tell him what you want and tell him to suck it up and do things right.