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SPUN BEARINGS #1035939
07/19/11 01:29 PM
07/19/11 01:29 PM
Joined: Dec 2008
Posts: 52
detroit mich
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stevehiss Offline OP
member
stevehiss  Offline OP
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Joined: Dec 2008
Posts: 52
detroit mich
i spun a bearing ,can the rod be resized or is it junk, it doesn't look black but it did get warm


I DARE TO BE DIFFERENT
Re: SPUN BEARINGS [Re: stevehiss] #1035940
07/19/11 01:35 PM
07/19/11 01:35 PM
Joined: Feb 2007
Posts: 5,080
organ
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maximum entropy Offline
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organ
check that thing with a fine tooth comb- everything. by everything, i mean the whole engine. top to bottommus. the rod will probably need to be resized. replace the bolts, and maybe the rods themselves. find out whahappen, and make it good!


for what is the good life if not doing things thoughtfully?
Re: SPUN BEARINGS [Re: stevehiss] #1035941
07/19/11 03:35 PM
07/19/11 03:35 PM
Joined: Jun 2003
Posts: 52,968
Romeo MI
MR_P_BODY Offline
Master
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Joined: Jun 2003
Posts: 52,968
Romeo MI
Quote:

i spun a bearing ,can the rod be resized or is it junk, it doesn't look black but it did get warm




What brand rod

Re: SPUN BEARINGS [Re: stevehiss] #1035942
07/19/11 04:49 PM
07/19/11 04:49 PM
Joined: Aug 2006
Posts: 614
Michigan
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Get-X Offline
mopar
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mopar
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Joined: Aug 2006
Posts: 614
Michigan
Quote:

i spun a bearing ,can the rod be resized or is it junk, it doesn't look black but it did get warm




If it discolored at all and requires resizing I persomally won't reuse them. A single rod doesn't cost that much to replace, no matter which rods you have. Just my , your mileage may vary.


'65 Belvedere
'68 GTX
'57 Dodge pickup
Re: SPUN BEARINGS [Re: stevehiss] #1035943
07/19/11 05:03 PM
07/19/11 05:03 PM
Joined: Nov 2004
Posts: 3,541
Syracuse,NY
CompWedgeEngines Offline
master
CompWedgeEngines  Offline
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Joined: Nov 2004
Posts: 3,541
Syracuse,NY
I will very rarely re-use a rod that has a spun bearing, even though it may look reconditionable. Can it be done? I suppose. Should it be done? No.

As an example, often times when a rod or main spins on a crankshaft, it almost always induces enough heat to actually bend the crankshaft. It is often common to check a crank after either one of these failures and find from .003 - .006 runout or bend in the crank, and you can look at the crank and think it could have hardly been damaged. If its a stock rod, then I definately would NOT re-use it. An aftermarket Hbeam, well, much better chance, but you'll need to pull the dowel sleeves, re-size it and check the rod on a Sunnen or similar rod straightener for bend and twist....


RIP Monte Smith

Your work is a reflection of yourself, autograph it with quality.

WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
Re: SPUN BEARINGS [Re: CompWedgeEngines] #1035944
07/19/11 05:38 PM
07/19/11 05:38 PM
Joined: Sep 2005
Posts: 2,442
LOWELL IN
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QWK_ENUF Offline
top fuel
QWK_ENUF  Offline
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Q

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Posts: 2,442
LOWELL IN
i also have a spun bearing in my motor. it was perfect until my ring gear came apart. when we repaired the convertor and replaced the trans case i had low oil pressure. found #3 rod bearing bad and all my mains to the copper. i have elgin h-beams and are not made any more. problem is my motor is balanced with 835 gram rods and the heaviest ones i can find are at least 780 grams or lighter. so what are my options other than resizing my rod or replacing all rods and rebalancing



WAXER
Re: SPUN BEARINGS [Re: stevehiss] #1035945
07/20/11 02:17 AM
07/20/11 02:17 AM
Joined: Aug 2003
Posts: 40,355
Bend,OR USA
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Cab_Burge Offline
I Win
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Posts: 40,355
Bend,OR USA
Quote:

i spun a bearing ,can the rod be resized or is it junk, it doesn't look black but it did get warm


I have had spun rods magged, resized and I reused them, that was a long time ago when racing money was really tight, houes payments, two kids in a christain school on a single income. I wouldn't do that now because to do it right you need to get the other seven resized so you can get the rod lengths within .002 of each other i have sen stock rods vary .008 in lengths in the same motors, must have been Monday or Friday motors don't forget that the heat treat is toast also so throw that expence into the decision making process BTW, what type and brand rod?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: SPUN BEARINGS [Re: Cab_Burge] #1035946
07/20/11 09:57 AM
07/20/11 09:57 AM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
master
Crizila  Offline
master

Joined: Oct 2003
Posts: 7,506
Az
Don't mean to hi-jack, but what does everyone think are the most common causes of spun bearings?


Fastest 300
Re: SPUN BEARINGS [Re: Crizila] #1035947
07/20/11 10:42 AM
07/20/11 10:42 AM
Joined: Feb 2007
Posts: 5,080
organ
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maximum entropy Offline
master
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Joined: Feb 2007
Posts: 5,080
organ
improper crush, rod bolt issues, or lubrication. beyond that could be anything.


for what is the good life if not doing things thoughtfully?
Re: SPUN BEARINGS [Re: maximum entropy] #1035948
07/20/11 12:17 PM
07/20/11 12:17 PM
Joined: Jan 2003
Posts: 16,375
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dogdays Offline
I Live Here
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Posts: 16,375
detonation ruptures the oil film and allows the vearing and crank to touch.
R.

Re: SPUN BEARINGS [Re: dogdays] #1035949
07/20/11 12:19 PM
07/20/11 12:19 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

detonation ruptures the oil film and allows the vearing and crank to touch.
R.




on rod bearings.

Re: SPUN BEARINGS [Re: Crizila] #1035950
07/20/11 12:30 PM
07/20/11 12:30 PM
Joined: Nov 2009
Posts: 2,177
ill
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dennismopar73 Offline
top fuel
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top fuel
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Joined: Nov 2009
Posts: 2,177
ill
lack of lubrication, / wrong size

Re: SPUN BEARINGS [Re: Crizila] #1035951
07/20/11 01:29 PM
07/20/11 01:29 PM
Joined: Aug 2003
Posts: 40,355
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 40,355
Bend,OR USA
Debis, rod elongation, improper fit of the bearing, to tight of clearnances, revving the motor to high on start up when cold before having oil pressure, same thing when hot, to thick of oil, the list is endless On clearances looser is better, cleanleaness is next to Godleaness when assembling motors, you can not keep them too clean


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)






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