Author Topic: 351c front seal question  (Read 831 times)

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Joey120373

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351c front seal question
« on: June 04, 2020, 04:06:00 PM »
I have Jays timing cover, and I plan on using a 351c seal.

I bought a brand new steal balancer spacer, and reading the instructions for the cover it says to machine the sealing surface out towards the balancer, by ~ .625 (? IIRC ) .

I gave the spacer to a co worker who has a lathe, but I wanted to double check before he started cutting on it. There is a short step from the large diameter ( balancer end ) to the back, and he wants to make sure he doesn’t cut to the wrong dimension.
I figured one of the experts here would know off the top of their heads what diameter to cut it to.

Thanks!


Joey120373

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Re: 351c front seal question
« Reply #1 on: June 04, 2020, 05:24:31 PM »
I forgot to mention I did look it up on the inter web, and I got a seal inner diameter of 1.874, with the sealing surface of the spacer at 1.875.

I am assuming this is correct but I trust the folks here way more that the internet ;D 8)

jayb

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Re: 351c front seal question
« Reply #2 on: June 04, 2020, 06:32:22 PM »
Joe, you just need to extend the sealing surface of the sleeve back towards the front of the crank.  That step you mention needs to move back 5/8" closer to the balancer.  The outside diameter of the sealing surface should remain the same as the original.  The seal you have should work fine - Jay
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC