#2 rod bearing has gone twice - Chevelle Tech
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post #1 of 9 (permalink) Old Jul 19th, 13, 10:34 PM Thread Starter
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Sam
 
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#2 rod bearing has gone twice

1969 0010 4bm block now .060.The shop has warranted this twice now and they are still at loss s to the cause. #2 bearing and only #2 bearing goes south every other bearing including the mains are perfect. The first time after 2000mi. 2nd time 600mi. Have any of you guys seen this before or have any idea the cause. They are replacing the crank due to being under size now. I've bought an other engine to get threw the season and am keeping this short block for a spare.

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post #2 of 9 (permalink) Old Jul 19th, 13, 11:41 PM
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Dave 383 now
 
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Re: #2 rod bearing has gone twice

Are they going to warranty it again?
So the last 2 times they just turned the crank?
What did they do with the rod, resize it or replaced it?

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post #3 of 9 (permalink) Old Jul 19th, 13, 11:48 PM
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Gary
 
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Re: #2 rod bearing has gone twice

yes, did they check the rod big end size and for being concentric?what do you mean gone? did it spin or is it an oiling problem etc
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post #4 of 9 (permalink) Old Jul 20th, 13, 10:34 AM Thread Starter
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Sam
 
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Re: #2 rod bearing has gone twice

an oiling problem don't know all galleys are clear #3 is perfect no signs of wear #1 is also perfect, rod was replaced 2nd time, crank has been ground 3 times and is now 30 under and is being replaced, yes they are warranting it again. Both times the bearing wore down to the copper.

65'el camino 360 10.5/1 750DP holly 7501 air gap M21 4sp 3:73 black on black
Never sell your stuff.....takes 30yrs to get it back.
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post #5 of 9 (permalink) Old Jul 20th, 13, 11:05 AM
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gfywac
 
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Re: #2 rod bearing has gone twice

i would replace the rod and piston. also make sure they are using new rod bolts every time. obvious there is a issue ,. strange you made no mention of replacing the piston 2nd time,,im sure it looks ok but ya never know.
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post #6 of 9 (permalink) Old Jul 20th, 13, 11:53 AM
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Re: #2 rod bearing has gone twice

If you replace rod bolts you will need to re-size the rods.
I would also look at the rod as being the culprit and the chamber on that cylinder.
It could be running hotter and getting into some detonation.
may be far fetched but worth a look
Checking ex header temps on each cylinder may show you something.

I built a 350 for my buddy and he got a fluiddamper balancer...
That is the only engine i ever built that ate bearings like you have stated...
2 times it done this ,,,I scratched my head trying to think of what i did that was different....
Balancer!!!! so i stuck on an old rubber style...couple years of 7400rpm shifts and NO issues..
your mileage may vary...
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post #7 of 9 (permalink) Old Jul 20th, 13, 4:32 PM
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Re: #2 rod bearing has gone twice

Check the rod for being bent.
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post #8 of 9 (permalink) Old Jul 20th, 13, 6:08 PM
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Lane
 
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Re: #2 rod bearing has gone twice

Hold your tongue to the left this next time when you torque it down jk

Its weird only #2 and nothing with #1
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post #9 of 9 (permalink) Old Jul 20th, 13, 6:41 PM Thread Starter
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Re: #2 rod bearing has gone twice

I should say the same shop did a complete rebuild on this motor when I bought the car and have very stand up people.

65'el camino 360 10.5/1 750DP holly 7501 air gap M21 4sp 3:73 black on black
Never sell your stuff.....takes 30yrs to get it back.
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