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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2001 Posts: 272 Shop Shark | | Shop Shark Joined: Sep 2001 Posts: 272 | I have a 1956 235 and as ususal the rear main leaks. A couple of years ago I saw an article in a magazine about a machine shop milling the rear main area to fit a 1 piece rear main seal. Did anybody else see the article or know anything about it? If so, I would like to try it on mine if anybody can help me locate the info.
Thanks
Brad | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 |
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | If there's enough of a demand for the single-piece seal modification, I can build an adapter for my Van Norman cylinder boring bar and provide that service. Counting the cost of the seal, and setup and machining time, it would be about a $150.00 procedure, plus shipping to middle Tennessee. I would need the bare block, with the rear main cap installed, to do the job.
Jerry
Last edited by Hotrod Lincoln; 10/18/2010 2:46 AM.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2001 Posts: 272 Shop Shark | | Shop Shark Joined: Sep 2001 Posts: 272 | WOW that was quick. I appreciate the input and when I get it torn down to see if its a shimmed model or not I know where to look now. Dave lots of good info in that article and Hotrod, Tennesee is only a days drive for me.....I'm 12 hours from Nashville | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | I've seen that article before, and it would be a pretty simple setup job to get a piece of 3/4" steel plate surface-ground on both sides so it could bolt to the back of the block with the bellhousing bolt holes and support a cylinder boring bar. The cat's paws on the boring bar will center the cutter in the rear main bearing bore, and the boring cutter can be set to a series of diameters that will end up a few thousandths below the outside diameter of the one-piece seal. It would probably require somewhere from 6 to 8 passes with a square-ground tool to make the seal counterbore. Then the seal can be driven into place after the crankshaft is installed.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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