Leaky CP3 w/ pics - 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

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post #1 of 11 (permalink) Old 01-12-2011, 10:26 PM Thread Starter
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Leaky CP3 w/ pics *Update*

***Update*** o-rings and shaft seals in tomorrow. For those that are a bit amiss like me with these CP3's, it seems to be some-what common with the steel/aluminum housings of the CP3 and o-rings with temp. changes. Funny how Bosch should offer 1mm thicker o-rings too....hmmm...Too bad Rich2500 isn't on here anymore. Solution to my problem: https://www.cumminsforum.com/forum/3rd-gen-powertrain/358936-cp3-seal-overhaul.html
Just noticed to what looks like my CP3 leaking where it butts up to the (gear?) housing. You can see where it's weeping up top and enough to cause a trickle down the wireharness below the motor in the 2nd pic.

None of the fuel lines, FCA, etc. is leaking either. What I don't know is how the CP3 seals to the gear housing via o-ring, gasket, etc.. And if there is an update of a better gasket/seal for this leak.

Thanks, Andrew






Last edited by motocraneguy17; 02-05-2011 at 05:58 PM. Reason: FYI
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post #2 of 11 (permalink) Old 01-12-2011, 11:39 PM Thread Starter
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Ok, it was brought to my attention and my understanding that the seal between the CP3 pump surface to the timing/gear housing is a o-ring on the CP3 pump shaft. So that being said, in order for there to be a fuel leak there, there would also have to be a oil leak as well. And there is only fuel leaking....what am I missing here? I'm gonna have to closer inspect the bottom of the pump more...

Thoughts?
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post #3 of 11 (permalink) Old 01-12-2011, 11:45 PM
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hey man! the way the cp3 seals up to the plate is a large gear nut! the nut pulls the cp3 up tight to the plate and tighten the gear to the cp3s shaft! you get to the gear nut by the access hole that is directly in front of ur cp3! also the are 3 bolts that hold the cp3 to the plate also!

im good friends with jeremy G. so if you need any help or Q you can get my number from him! name is matt rice!
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post #4 of 11 (permalink) Old 01-12-2011, 11:57 PM
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also you are right! the only thing that seal ring does is seals the oil in!....here is a pic of the oil ring seal!



and the part i have cirlced in red is the part i would say is leaking!? just from what i can tell!

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post #5 of 11 (permalink) Old 01-13-2011, 12:41 AM Thread Starter
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The red arrow is pointing to the piece that I think is leaking where I drew the red lines. Especially underneath.
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post #6 of 11 (permalink) Old 01-13-2011, 12:59 AM Thread Starter
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The blue circles must be the fasteners that hold the piece on that I think is leaking? Wonder how those 2 particular pieces seal?
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post #7 of 11 (permalink) Old 01-13-2011, 10:01 AM Thread Starter
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Anybody got a good picture of the weep hole on these things?
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post #8 of 11 (permalink) Old 01-13-2011, 12:22 PM Thread Starter
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post #9 of 11 (permalink) Old 01-15-2011, 01:02 AM
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Pull it and tighen those screws you have circled. The CP3 is held to the cover by the front section, the heavy back end of the pump is held to the front by those 6 small screws. After time they will stretch and become loose.

Another issue is cold weather leaks, sometimes those can't be easily taken care of.

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post #10 of 11 (permalink) Old 02-05-2011, 05:21 PM
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Subscribing to this..I have the exact same issue (I think) that same electrical plug on mine is wet and was caked in dirt.. I guess its been leaking for a bit...however the fuel doesn't ever make it to the ground...I really don't want to buy a new CP3!

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post #11 of 11 (permalink) Old 02-05-2011, 05:54 PM Thread Starter
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