CP3 Seal Overhaul - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

Closed Thread
 
LinkBack Thread Tools Display Modes
post #1 of 65 (permalink) Old 01-20-2011, 10:39 PM Thread Starter
Diesel Freak
 
motocraneguy17's Avatar
 
Join Date: Oct 2009
Posts: 687
Thanks: 90
Thanked 104 Times in 65 Posts
iTrader Score: 3 reviews
CP3 Seal Overhaul

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.
Reading Pa.19601
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.


Last edited by motocraneguy17; 01-21-2011 at 08:20 AM.
motocraneguy17 is offline  
The Following 6 Users Say Thank You to motocraneguy17 For This Useful Post:
874mula (02-12-2013), Bio-cummins (03-15-2014), Broaner (01-25-2014), JayG (02-01-2012), Sandaholic (05-12-2013), superbad7 (02-07-2011)
Sponsored Links
Advertisement
 
post #2 of 65 (permalink) Old 01-21-2011, 12:22 PM
Cummins Nut
 
cowbell's Avatar
 
Join Date: Jul 2009
Location: Phoenix
Posts: 422
Thanks: 19
Thanked 89 Times in 64 Posts
iTrader Score: 0 reviews
Nice. Mine is weeping since it has gotten cold out and I will be replacing the seals next spring/summer when I can ride the motorcycle again.

'15 3500 Limited, CTD, SRW, 4X4, Granite Crystal, Mega Cab, Aisin, factory rear air bags, 5th wheel prep
cowbell is offline  
post #3 of 65 (permalink) Old 01-21-2011, 12:24 PM
Cummins Nut
 
cowbell's Avatar
 
Join Date: Jul 2009
Location: Phoenix
Posts: 422
Thanks: 19
Thanked 89 Times in 64 Posts
iTrader Score: 0 reviews
how many hrs to get it all done??

'15 3500 Limited, CTD, SRW, 4X4, Granite Crystal, Mega Cab, Aisin, factory rear air bags, 5th wheel prep

Last edited by cowbell; 01-21-2011 at 12:26 PM.
cowbell is offline  
Sponsored Links
Advertisement
 
post #4 of 65 (permalink) Old 01-21-2011, 02:32 PM Thread Starter
Diesel Freak
 
motocraneguy17's Avatar
 
Join Date: Oct 2009
Posts: 687
Thanks: 90
Thanked 104 Times in 65 Posts
iTrader Score: 3 reviews
Minus dinner and BSing, about 3-4 hrs.
motocraneguy17 is offline  
post #5 of 65 (permalink) Old 01-25-2011, 03:55 PM
West Virginia Chapter VP
 
THEBIGJOB's Avatar
 
Join Date: Feb 2008
Location: Ona, WV
Posts: 1,394
Thanks: 106
Thanked 87 Times in 79 Posts
iTrader Score: 1 reviews
Thanks for the write-up Andrew I'm sure this will be some help to someone. It is an easier job than I thought it would be, I will also be doing mine in the spring

A budget tells us what we can't afford, but it doesn't keep us from buying it.

Some Air, Some Fuel, Some Purdy Stuff, Some Hidden Stuff, and a Smarty Do Dad with TNTR that is NO Gimmick
THEBIGJOB is offline  
post #6 of 65 (permalink) Old 02-06-2011, 11:25 AM
Newbie
 
Join Date: Feb 2011
Location: MD
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
I have the same issue with my CP3. Diesel is all over the the wire harness below the unit. Is that going to hurt the harness? If I replace it with a stage 1 upgrade will I have the same issues with the weep or leak? Do I have to upgrade the injectors if I upgrade the CP3. My plans are to put an AirDog II on with a new sending unit in about a month so I could replace the CP3 unit then. Any thoughts or ideas would be great
ThinkBio is offline  
post #7 of 65 (permalink) Old 02-06-2011, 09:10 PM Thread Starter
Diesel Freak
 
motocraneguy17's Avatar
 
Join Date: Oct 2009
Posts: 687
Thanks: 90
Thanked 104 Times in 65 Posts
iTrader Score: 3 reviews
Didn't hurt my harness. If you upgrade then I would say your leak would only get worse due to higher pressure/volume. You don't have to upgrade your injectors if you upgrade your pump. Any unused fuel will be returned
motocraneguy17 is offline  
post #8 of 65 (permalink) Old 02-06-2011, 10:07 PM
West Virginia Chapter VP
 
Brians06dodge's Avatar
 
Join Date: Aug 2009
Location: S. Charleston, WV
Posts: 840
Thanks: 47
Thanked 75 Times in 68 Posts
iTrader Score: 1 reviews
Just send your CP3's to Andrew and he will fix them. LOL

Nice job on the write up Andrew!

06 4x4, 5.9L QC 3500 DRW, 6 spd Row. SB DD 3600 SFI, Smarty Sir with TNT, Bullseye 66, Red Line 150's, Arson III kit, Airdog II 165, Amsoil by pass kit, Boost fooler, S&B cold air.

You are only as fast as the size of your Bank Account or clutch!
Brians06dodge is offline  
post #9 of 65 (permalink) Old 02-07-2011, 09:56 AM
Newbie
 
Join Date: Feb 2011
Location: MD
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Thanks Guys

I will try to do the rebuild with the bigger washers.

Is this a fix or just a band-aid? From what Im reading they all leak from piss poor design.

05 3500 G56 6 Speed, K&N Air intake, 5" MBRP Staight Pipe, EDGE Juice with Attitude CS, FASS 150, II CP3
ThinkBio is offline  
post #10 of 65 (permalink) Old 02-07-2011, 11:16 AM Thread Starter
Diesel Freak
 
motocraneguy17's Avatar
 
Join Date: Oct 2009
Posts: 687
Thanks: 90
Thanked 104 Times in 65 Posts
iTrader Score: 3 reviews
Thanks Brian.

ThinkBio, it's working so far. I'm just making sure I always add a fuel additive when filling up to keep the possibility of ULSD from ruining the seals.
motocraneguy17 is offline  
post #11 of 65 (permalink) Old 02-25-2011, 10:14 PM
Diesel Freak
 
RedCummins04's Avatar
 
Join Date: Dec 2007
Location: PA
Posts: 955
Thanks: 92
Thanked 127 Times in 102 Posts
iTrader Score: 2 reviews
Great info mine has been leaking more and more as soon as it warms up I need to do this.

2004 Q/C SB 4x4 6 speed, FMW467, Stainless Diesel, Innovative UDC, SB 3600, Airdog 200, 22's, US Gear EB, ARP's, Exergy 100% over, Motorsport duals, Turbosmart.
RedCummins04 is offline  
post #12 of 65 (permalink) Old 02-25-2011, 10:22 PM
Diesel Freak
 
Quicktime_GT's Avatar
 
Join Date: Feb 2011
Posts: 640
Thanks: 45
Thanked 169 Times in 101 Posts
iTrader Score: 0 reviews
Awesome .. Thanks for the info ..

Im an engineer for a company that makes seals / gaskets .. I'll fish around some of our resources and see if we have access to any of this .

A "kit" would be very helpful

'13 black Laramie - PPEI, SB3250, BMF,
'07 black qcsb, 6.7 / G56 [sold]
'03 Turbo Cobra
Quicktime_GT is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome