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Old 12-07-2018, 10:39 AM   #1
The Lucky Star
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Default Best Rear Main Seal

Good morning,

I'd like your opinion on the best aftermarket rear main seal for a hopped up motor. What are the options? How good is each one? Who sells them?

Thanks!
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Old 12-07-2018, 10:46 AM   #2
BRENT in 10-uh-C
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Default Re: Best Rear Main Seal

Let's start by asking why do you need an aftermarket rear seal? What are you doing that requires one? Are you pressurizing the rear main? None of the options available are really geared towards the hobbyists, and there will be machine work involved such as machining the slinger from the crankshaft. If you use the Terry Burtz seal, then you need to be able to adjust the thrust (-again, machine work by the machinist) to set the proper thrust. I would pose the question to your engine machinist first, asking what he has been successful using.


As an engine rebuilder myself, I have had several failures of a type that Snyders sold and have now gone back to the stock slinger method.
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Old 12-07-2018, 11:11 AM   #3
Purdy Swoft
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Default Re: Best Rear Main Seal

The original rear slinger setup works well for me as long as the oil isn't over filled .
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Old 12-07-2018, 01:22 PM   #4
Dave in MN
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Default Re: Best Rear Main Seal

I am in agreement with Brent. Proper rear cap alignment, bearing clearances and crankshaft end play will give you a leak free engine with the original oil slinger.

I, like Brent, also build engines. I have not found a good after market seal for the "A" crankshaft that is consistently trouble free.

If you insist on using something else that stock, I would suggest the Burtz seal. Caution: The rear slinger needs to be dead-on concentric with the rear main journal so that means it needs to be ground and polished while the crankshaft is at the crank grinder.
Good Day!
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Old 12-07-2018, 08:57 PM   #5
The Lucky Star
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Default Re: Best Rear Main Seal

Thank you for the replies. I"m planning on building an A motor with a turned down crankshaft for a salt car. Yes, it will be pressurized.

Thanks again.
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Old 12-08-2018, 12:50 PM   #6
Jim Brierley
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Default Re: Best Rear Main Seal

"A" motor with a turned down crank. Does that mean a B or C crank? Either one is better because of their strength resulting from larger bearings. If that is your intention, turn the mains to as large of a size that you can, to keep strength. 'A' main studs are 2" between them, there are bearings available with a 2" O.D. that will just barely fit when the block is bored, I think 1.7" (I.D.) bearings. Find available bearings before you start the engine build! Most of us Salt Rats use the C crank, many are now going to 5-main cranks and a girdle. Contact me if you think I can help. jimb4e4@gmail.com
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Old 12-08-2018, 12:58 PM   #7
johnneilson
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Default Re: Best Rear Main Seal

All,

there is a Saturn rod bearing that will just fit between the studs/bolts.
finish size on crank is 1.850
largest I could find and not have to move the main bolts.
also, if HP is above 150, it is wise to weld up flange on crank and machine for 2 pc chevy seal.

J
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Old 12-09-2018, 10:25 PM   #8
The Lucky Star
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Default Re: Best Rear Main Seal

Thanks again for the info. Yes, I was planing on welding up the rear seal area. Is the Chevy two piece seal the best? Where can I find the spec's for the conversion?

I have a C crank that I'll be working with. Really, that's where I'm starting.

Thanks again.
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Old 12-10-2018, 10:23 AM   #9
johnneilson
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Default Re: Best Rear Main Seal

You can make the parts yourself or buy a kit.
look here, Dan McEachern makes very good parts.
https://www.hotforhotfours.com/advertisers.htm

J

PS, the 1.850 info above is to use a Mod "A" block with smaller journals.
the "B" block and "C" crank use other bearings.
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Old 12-10-2018, 03:24 PM   #10
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Default Re: Best Rear Main Seal

Our improved Model A with pressure fed mains leaked more oil than I liked, so the crankshaft (a new Burlington) was built up and a two piece Chevy oil seal used which has been successful.
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