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chevy question

Post  cooter on June 19th 2012, 10:03 pm

have a 502 gen 5 i built in a jetboat. after 13 hours of 4600 rpm all was well until the next boat ride. after 5 minutes it pushed out the one piece rear seal. Any idea why?

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Re: chevy question

Post  DanH on June 19th 2012, 10:55 pm

it a chevy , to much blowby

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Re: chevy question

Post  rmcomprandy on June 19th 2012, 11:11 pm

DanH wrote:it a chevy , to much blowby

YES ... for some reason the blow-by increased enough to blow out the seal.

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Re: chevy question

Post  cooter on June 19th 2012, 11:21 pm

wouldnt blow by push out the dipstick instead of the seal?

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Re: chevy question

Post  dfree383 on June 20th 2012, 12:03 am

whats the oil pressure?
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Re: chevy question

Post  cooter on June 20th 2012, 12:20 am

60 at 4600, 20/50 amsoil

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Re: chevy question

Post  dfree383 on June 20th 2012, 12:23 am

is the seal installed correctly?

Stock or aftermarket crank?
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Re: chevy question

Post  cooter on June 20th 2012, 11:43 pm

as it turns out, the seal was not installed far enough into the bore, i installed it flush like a smallblock chev 1 piece seal. I also used silicone instead of installing it dry. Live and learn i guess.

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Re: chevy question

Post  dfree383 on June 21st 2012, 12:30 am

you'll know next time ! Lesson Learned
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Re: chevy question

Post  rmcomprandy on June 21st 2012, 8:14 am

cooter wrote:as it turns out, the seal was not installed far enough into the bore, i installed it flush like a smallblock chev 1 piece seal. I also used silicone instead of installing it dry. Live and learn i guess.

Using silicone ... if it doesn't sit for a week, it will come out again.

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Re: chevy question

Post  cooter on June 21st 2012, 8:35 am

thanx randy, wont use silicone this time. How tough is it to get a new seal in without removing the main cap?

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Re: chevy question

Post  zbob on June 22nd 2012, 9:18 pm

not sure if one is made for your engine, but i have a tool to install one piece seals on sbc motors. kent-moore. looks like a cone shaped hub with a large wing nut. it threads into the back of the crank and tightening the wing nut pushes the seal in.....bobn

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Re: chevy question

Post  cooter on June 24th 2012, 6:59 pm

i thought i would pull the pan, check bearings and install the seal with the main cap off. Killed two birds with one stone. bearings look like new and the seal slid right in. thanx for the help.

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