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Old 09-17-2005, 08:30 AM
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Spun Bearing

My 383 Stroker motor spun a bearing as per a mechanic. What is the worst case senario. I am really depressed. The engine only has about 5,000 miles on it. I had a shop put in bigger roller cam and matching components several weeks ago. At the track, "4 runs" I may have over revved it at the line (last run), but I don't think it was over 5,500 rpm. I guess the bottom half of the engine will need to be inspected.
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Old 09-17-2005, 09:29 AM
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Worst case is its a main bearing and its really burnt up the block main bore is wasted, crank is junk.

Best case is its a rod that lightly spun and all you need is a new rod and the crank reground.

Wont know till its apart.
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Old 09-18-2005, 02:07 AM
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If it's lightly spun. You do not need a new rod. You can have it resized.

Worst case scenario.
This happened to me.
I spun a bearing. Pieces broke off and the oil pump picked it up. Sent it through the entire crank and wiped out every bearing and every journal. A piece got caught in the oil pump and tore it to pieces. This pushed the cam ahead and melted off my cam button and wiped out 2 exhaust lobes. #4 cylinder over pressurised and shot my #4 intake pushrod through my rocker.

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Old 09-18-2005, 05:13 AM
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Thanks for the reply guys. Anyway, there is a possiblity of my freind selling me his reworked 502 that I can put into my Chevelle. It is currently in a Camaro. The engine had about 20 runs, with about a total of 1,500 miles on it and was broken in the right way.

I am kinda leary in putting in a used motor but it sounds awesome and runs very strong. The engine was upgraded about 3 years ago to produce about 650 horses and since the rebuilt he put in about 100 miles in it.

He is doing a full restoration and looking at putting in a 572.

Anyway, I am hoping for the best and the bearing is only lightly spun but if it is major it'll be a excuse to get the 502.
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Old 09-18-2005, 04:18 PM
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worst case senerio... you repair it and it does it again. you need to find out why it spun the bearing in the first place. that just doesn't happen by itself. bearings spin due to lack of lubrication. they only provide a surface for a film of oil. the crank rides on the film of oil. was it a rod bearing or a main? back to the lubrication problem, you lost your film of oil for some reason. bearing clearence, too much clearence the crank pressure can push the oil out. not enough clearence creates heat and melts the lead coating on the bearing surface. did you have enough oil? a high volume pump can pump the pan dry at higher rpms.
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Old 09-18-2005, 04:41 PM
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Quote:
Originally Posted by tattoo3
worst case senerio... you repair it and it does it again. you need to find out why it spun the bearing in the first place. that just doesn't happen by itself. bearings spin due to lack of lubrication. they only provide a surface for a film of oil. the crank rides on the film of oil. was it a rod bearing or a main? back to the lubrication problem, you lost your film of oil for some reason. bearing clearence, too much clearence the crank pressure can push the oil out. not enough clearence creates heat and melts the lead coating on the bearing surface. did you have enough oil? a high volume pump can pump the pan dry at higher rpms.
Pumping the oil pan dry with a HV pump, according to Melling the oil pump people, is BS.
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