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Unread 03-29-2012, 08:22 PM   #1
Brian86992
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OPDA failure on 2002

A few weeks ago my 02's 4.0 dropped three piston skirts and I recently had it replaced with a 4.0 from an 06. Being a 2006 engine I would normally be concerned about the OPDA failure however the engine was nearly brand new and I would be swapping in the OPDA from my 2002 instead.



OPDA in 2002 block


2006's OPDA that was not used


Well... much to my surprise when the OPDA/CPA was pulled from my 02 we found very abnormal wear on it.





Obviously I bought a new one to put in the 2006 block I thought I just might bring this to the attention of other TJ owners and would like to hear if this is how the other OPDA failures looked.

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Unread 03-29-2012, 08:59 PM   #2
ops5
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I would post this up in the main opda thread

http://www.jeepforum.com/forum/f9/20...ilure-1144202/
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Unread 03-29-2012, 09:09 PM   #3
Brian86992
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I posted a link to this thread over there. I wanted to create a separate thread because of the abnormality of the situation and didn't want this posting to get lost among hundreds of others.
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Unread 03-29-2012, 09:39 PM   #4
marka2k
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Dumb question but could the OPDA failure be attributed to dropping the three piston skirts?
I am asking because I do not actually know but am curious.

Thank you
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Unread 03-29-2012, 09:45 PM   #5
Brian86992
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Quote:
Originally Posted by marka2k View Post
Dumb question but could the OPDA failure be attributed to dropping the three piston skirts?
I am asking because I do not actually know but am curious.

Thank you
To be honest I'm not quite sure. I know that I drove for several thousand miles with a tick that I thought was a sticky lifter and turned out to be a piston skirt. The problem that prompted getting a new engine was a second, or third and more severe piston skirt being dropped resulting in a very noticeable knock.

Here's the tricky part with cause and effect... I don't know if the pistons broke and the shavings wore down the OPDA or the OPDA wore down, causing the pistons to break. I'm still not 100% sure of the cause of my broken pistons but I know that overheating, a cracked head that dumped coolant into the engine and moving to Indiana (exposing the engine to freezing temperatures for the first time) could all play a role.
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Unread 04-05-2012, 07:22 PM   #6
willydigger
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Awesome info. Thanks for the link on the main thread. I will add a link to the first page for easy reference. Very odd.
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Unread 04-05-2012, 07:28 PM   #7
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Did it spin freely? Would you be willing to dissect it and take photos? How many miles were on the CPS?
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