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Spinning a crank bearing.. What damage?
#297213
04/23/09 09:48 AM
04/23/09 09:48 AM
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Joined: Jan 2003
Posts: 4,283 Danville, NH
Mopar_Mike
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OP
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Posts: 4,283
Danville, NH
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I am picking up a 440 block that the engine has spun a crank bearing (sellers words, could be a rod but I do not know yet) What type of damage should I expect? The engine is apart so I can inspect it. I am mostly concerned with the block and not the crank. Is it possible the block could be damaged from spinning a bearing? Thanks.
RS23L7 4-Speed
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Re: Spinning a crank bearing.. What damage?
[Re: MLR426]
#297215
04/23/09 12:30 PM
04/23/09 12:30 PM
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Joined: Nov 2003
Posts: 2,715 closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
If it's a spun main bearing the block would need to be line honed to correct bearing crush. In doing this you need to remember to order a new -.005 timing set during assembly. If it's a spun rod bearing, regrind crank and resize the rods big end for correct bearing crush during assembly.
logan426
Further to that, check to see if there is discoloration (blueing of the cap, rod, block or crank) as it may have altered the metallurgy of the component in question.
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Re: Spinning a crank bearing.. What damage?
[Re: Mopar_Mike]
#297216
04/23/09 12:35 PM
04/23/09 12:35 PM
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Joined: Jan 2003
Posts: 31,027 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,027
Oregon
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A spun main bearing will often ruin the block.
A spun rod bearing is usually no big deal although I did totally trash an engine on the dyno once by spinning a rod bearing. The rod bearing spun which caused the piston to hit the head and then the cylinder wall split. So that engine was toast from top to bottom.
Last edited by AndyF; 04/23/09 12:36 PM.
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Re: Spinning a crank bearing.. What damage?
[Re: AndyF]
#297217
04/23/09 01:10 PM
04/23/09 01:10 PM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
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master
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ILL
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Also to add more if the rod or main bearing area of the crank has taken alot of heat it's possible the crank could be cracked and junk. These are all jugdement calls by all of us because we are not looking at any parts.
logan426
Last edited by Logan426; 04/23/09 01:11 PM.
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Re: Spinning a crank bearing.. What damage?
[Re: MLR426]
#297218
04/24/09 06:52 AM
04/24/09 06:52 AM
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Joined: Jan 2003
Posts: 4,283 Danville, NH
Mopar_Mike
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OP
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Posts: 4,283
Danville, NH
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Thanks all for your input.
RS23L7 4-Speed
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