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How to look for cracks in block and can we replace main bearings without removing block?; What are the reasons why block gets cracked?
Topic Started: Sep 14 2011, 12:35 AM (778 Views)
vikasintl
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I have not removed block during this rebuild and am wondering how can I make sure that block does not have cracks?

all cracks can be seen through naked eye?

And most importantly what are the reasons why block gets cracks?

I guess overheating but is there any other reason?

Also another question...so I don't start another thread for this question..

Do we have to remove block in order to replace main bearings?
Edited by vikasintl, Sep 14 2011, 12:54 AM.
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Spud
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The contraction and expansion of metal eventually causes fatigue in metal which causes cracks, no you can't see all them sometimes you got to get the engine block sonic checked but I figure if they are that small to not notice then should make difference with what little power these engines put out.
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vikasintl
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ace.of_alltrades
Sep 14 2011, 12:44 AM
The contraction and expansion of metal eventually causes fatigue in metal which causes cracks, no you can't see all them sometimes you got to get the engine block sonic checked but I figure if they are that small to not notice then should make difference with what little power these engines put out.
Do you know if we can replace main bearings without removing crankshaft and/or block?
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Woodie
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You can, buy just snaking the new bearing in around the journal, pushing the old out with the new. Don't bother though. Unless something catastrophic has happened, nothing ever goes wrong with the block, crank, bearings in a G10.
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starscream5000
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Got 70 MPG?

Woodie
Sep 14 2011, 06:16 AM
You can, buy just snaking the new bearing in around the journal, pushing the old out with the new. Don't bother though. Unless something catastrophic has happened, nothing ever goes wrong with the block, crank, bearings in a G10.
Yep, I just finished cleaning up my block over the weekend and the only things in the block that look like cracks are casting marks.

This is for a block with about 200K miles on it.
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Spud
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Woodie
Sep 14 2011, 06:16 AM
You can, buy just snaking the new bearing in around the journal, pushing the old out with the new. Don't bother though. Unless something catastrophic has happened, nothing ever goes wrong with the block, crank, bearings in a G10.
Well there is a G10 up road still in Metro according to auto salvage yard people said it spun a bearing, wonder if they could be wrong...
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Scoobs
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:D

Woodie, the blue metro i have, when i bought thta one, it was said to have spun a bearing.... and did you actually see what happened? yea i dont beleive what ppl tell me when i buy cars now.
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Rusty34
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[ *  *  * ]
Reasons blocks crack:
Overheating
Freezing in Winter, antifreeze not maintained
Fatigue (not likely with all OEM components)

Can you rebuild without removing the block? Yes, but why would you since you are that close to having it out? Will be easier to work on and you can do a better job measuring and inspecting components for wear. If you have internal damage to the block or crankshaft wear surfaces it will have to come out. You can do a better job with it out and apart and on your bench.

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t3ragtop
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Turbo3 and Twincam Tweaker

i rebuilt a g10 that had a bottom main bearing wedged in on top of the upper main bearing. it hammered pretty hard.

i have also just used the bits from 2 engines to make one serviceable car doing all the tasks with both engines in cars. the parts came from my local pick and pull and i may have had $120 in parts including new gaskets and seals.

if you know enough to rebuild an engine on the bench, you can easily rebuild one while it's bolted up in a metro. heck, i think it's easier because you get to spend about half the time laying on your back. :D
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