Oil pump shimming

[Bartnik_24]

Hello I was just wondering if it’s a good idea to shim the oil pump on a 2250 and 2350? The shop I go to says they’ve never heard of doing that and don’t know why you should and just to put a new oil pump on. I’ve read on here about people doing it but would just like to hear thoughts on it and the pros and cons. Thanks

[Rawze]

(11-23-2021 )Bartnik_24 Wrote:  Hello I was just wondering if it’s a good idea to shim the oil pump on a 2250 and 2350? The shop I go to says they’ve never heard of doing that and don’t know why you should and just to put a new oil pump on. I’ve read on here about people doing it but would just like to hear thoughts on it and the pros and cons. Thanks

Most of the people on the forum here that ave rebuilt their own engines have shimmed their oil pumps for the ISX. No problems so far for any of them, as long as it was not done incorrectly.

here are some related threads/posts about oil pump shimming. ..

(old style pumps)...
http://rawze.com/forums/showthread.php?t...0#pid14660

http://rawze.com/forums/showthread.php?t...2#pid35802

(newer style pumps)...
http://rawze.com/forums/showthread.php?t...6#pid60306

[JMBT]

I have a CM2250 with 850k. I chose not to shim my pump when I put the new on. I will tell you to be careful of the new style pump. The gears are wider then the original and mine made a terrible noise with the new wider pump gear riding on the old worn crank gear… it was bad enough I dropped the pan again and put an old style reman on which seemed to stop the noise… hope this helps.

[Peashooter67]

I highly recommend it even though my imput don’t count for much. Boy howdy what an improvement on idle pressure when the engine is hot and you know the cam bearing aren’t being starved at idle anymore.