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#1
05-31-2020, 08:41 PM
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Main bearing wiper effect
On my 400 refresh I noticed I bit of blueing at the ends of the main bearing halves where they crush together. I read something on the wiper effect years ago but can’t remember the fix. Any info or a link would be appreciated.
Thanks, B&P.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk |
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#2
06-01-2020, 05:48 AM
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In that case if all the main Bearing and the blueing is on both haves of the Bearing incerts then the main Bores are sized to provide too much Bearing crush.
There pinching in at the parting line and reducing the needed Bearing clearance and making for reduced oil film and higher local temps. In the least continued running will burn a Bearing!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
06-02-2020, 03:30 PM
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Sounds like you need to align hone the main bearing bores. Could have been a botched prior align hone or main caps swapped from another motor and never resized.
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Triple Black 1971 GTO |
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#4
06-03-2020, 05:55 AM
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Don't align hone to fix this issue, as that always leads to the problem of a lot of slop in the timing chain that then needs to be dealt with, you want to align Bore the mains to get the needed Bearing crush!
Bearings are made with a different shape / dimension in the parting line area so as to not have the issue that your seing taking place, so that would lead me to say that something is way off with those main journals or those are a very defective set of Bearings!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 06-03-2020 at 06:01 AM. |
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