I just overhauled some of the main seals on my CP3. I figured this little list of seals and tips would help a DIY person out that wants to rid the weeping or leaking CP3 problem.
First of all here's the list...Now I do have to give credit here to Rich2500, (this is who I dug up the list from in the archives) on here...but sad thing is, he's not here anymore due to converting back to a gasser.
1- 25mmx36mmx7mm harwal seal this is stock size (Inner CP3 shaft seal)
1-25mmx37mmx7mm harwal seal this is stock size (Outter CP3 shaft seal)
1-2.50mmx54.00mm ame o-ring this is 1mm thicher then stock ***
6-2.00mmx7.00mm ame o-rings these are 1mm thicker then stock***
1-2.00mmx67.00mm ame o-ring this is stock size***
Now as far as part numbers...it's not that simple. The outter CP3 shaft seal can be ordered from Bosch P/N: F00N202337
The inner CP3 shaft seal is on backorder (imagine that since it's probably the main culprit for the leak!) so you'll have to order it from here: Philadelpia Ball and Roller Bearing Co.
1346 Centre Ave.
phone# 610-376-7500 Talk to Dave
And as far as the o-rings, I went to my local specialty hose shop. But they ordered it from this company: APG Ohio Phone# (440) 926-1234
ALL SEALS ARE MADE OUT OF VITON! This is important due to the nature of the material/conditions.
I pulled my CP3 and put the back (steel) end in a jaw-vise and gently
wiggled and pulled the front (aluminum) end up and off. Use lot's and lot's of brake cleaner and prep and area the would make even Monk envious. I used vasoline when installing the new seals. Also, the Inner CP3 shaft seal is a bear to get out. Best to dimple (relieve tension) the seal in with a chiesel or screw driver and then take a slide hammer with a claw and pull out. If you want to pry out, use a popsicle stick to create a buffer between the screwdriver and CP3 front housing being carefull not to tear it up. Use the backend of a large socket to seat the new seals also helps.
It definetly helps to have a second set of hands (and brains) when doing this. A big thanks is order to THEBIGJOB on here for sacrificing his beauty sleep to help me!
A little FYI...the CP3 is made up of two different metals, aluminum and steel. So the different temperature expansion properties of the two metal combined with sub par o-rings in a few locations obviously creates the weep or leak. Now Shane on here recomends for a quick fix is to pull the CP3 and loosen and tighten the 6 small bolts that hold the CP3 together because they can stretch and become loose. Since I was gonna have to pull it, I figured I might as well replace a few key seals. There is a weep hole that is between the two CP3 shaft seals that allow fuel and pressure to escape should the inner seal start leaking so it doesn't blow thru the Outter cp3 shaft seal and flood the engine oil with diesel fuel.
I could've bought a seal kit online, but I wanted the thicker o-rings for a better seal. I also saved a few dollars too. All in all I have about $40-$50 in it. Also the seal kit is backordered from Bosch too.
Here is a link to a really good how-to on pulling a CP3...https://www.cumminsforum.com/forum/3r...r-cp3-diy.html
Hope this helps someone.