seized wrist pins - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 6 (permalink) Old Jan 10th, 01, 10:05 AM Thread Starter
Join Date: Jan 2001
Location: Lino Lakes, MN USA
Posts: 3

Upon firing up a newly assembled engine, the engine stopped abruptly after only 2 seconds of run time. The engine would not turn over after that. I opened the motor and found all 8 pistons would not rotate on the wrist pins. I had to smack the rods with a hammer just so that I could remove them from the block! The crank appears fine, no wear found with the bearings or cylinder walls. The pistons rotated freely when I first assembled the engine. Any ideas what might have happened? Thanks!
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post #2 of 6 (permalink) Old Jan 10th, 01, 12:34 PM
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Location: Rohnert Park, CA
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Don't take this wrong but did you apply any oil to the pins when you assembled the motor? Did you pre-lube the motor prior to initial start-up? If the pistons moved freely prior to start-up it sounds like a lack of lubrication.

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post #3 of 6 (permalink) Old Jan 11th, 01, 02:20 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,280

I have to agree with John, except that I have seen one case of not enough pin clearance from the factory on a set of TRW forged pistons. The locked up after about 10 minutes just like yours. Did you install the pistons on the rods ?? If so how did you do it. The only correct way is to use a rod heater to heat up the end of the rods so that they will expand and the pin will slide through. What I always do before the rods cool off totally is to apply a good assembly lube (I use Melling cam lube) to the pins. The heat tends to suck it into the pin bore...sort of like sweat soldering plumbing pipe. We do this on every set of pistons we install and have never had a failure. If you had a machine shop install the pistons, they probably would have noticed it if the pins were tight in the pistons. The pins only get lubricated by splashing oil when they first start, so it is very important to lube them properly when assembling.
Hopefully all it hurt was the pistons and pins.
Hope this helps,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
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post #4 of 6 (permalink) Old Jan 12th, 01, 11:04 AM
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Does this mean that, no 'E' in Camaro has to change his ID to no 'D' in Camaro

Sorry, I just had to.
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post #5 of 6 (permalink) Old Jan 17th, 01, 10:35 AM
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no thats the new caddilac (not catalitic)converter replacement for the camEro


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post #6 of 6 (permalink) Old Jan 17th, 01, 12:57 PM
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LOL, God I love this place.


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