found this in my motor im trying to rebuild.. un-normal wear?

cas23

Registered User
well i got a 90 xr7 i tore the motor out of, well its got a weird wear pattern and not really sure. i do have my crank at a local machine shop, havent heard on it yet hope to have word on it soon. but heres the pictures we took.

the others look fine..

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same journal.
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That's how mine looked. But I blew a softball sized hole in the block and ran for about 1min.
 
this motor was not blown up. the one in my 90 sc went. i know it ran, i literally pulled it off the trailer, into a storage bay, and it sat. i didnt even start it up to pull it into a garage. it got pushed. i just dont really know what caused this.. the harmonic balancer is new, im wondering if a bad hb could do this?
 
I've seen this same wear in just about every SC motor I've torn apart.....:p

A number of things can cause that wear pattern.....

Bad alignment of the crank bore due to shift in the engine block over time
Oil wedge caused by high oil pressure

How many miles on that engine....:confused:
 
I've seen this same wear in just about every SC motor I've torn apart.....:p

A number of things can cause that wear pattern.....

Bad alignment of the crank bore due to shift in the engine block over time
Oil wedge caused by high oil pressure

How many miles on that engine....:confused:

uhhh the cluster says 130k or about that. i dont think it was messed with much. all stock except a spectre "go fast" air filtration device
 
I would think that its just the main bore being out of alignment.

I would get the block align bored.
 
That is completely normal bearing wear. If you increase your bearing clearances some of that will decrease.
 
got the crank. its bot bent. he said it was wore half a thousands. so it will probably be cleaned and put together this weekend!
 
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