BB Oil Drain Plug Question
11-20-2016, 05:16 PM
#1
Melting Slicks
Thread Starter
BB Oil Drain Plug Question
Does the oil drain plug have or need a washer on it to seal the oil pan? If it does, what type of washer is used? Mine is a aftermarket magnetic drain plug. Thanks All.
11-20-2016, 05:21 PM
#2
Melting Slicks
All '67 drain plugs left the factory with a thin white nylon gasket under the head. It's spelled out in the judging guide.
Last edited by Mike67nv; 11-20-2016 at 06:27 PM.
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babbah (12-05-2016)
11-20-2016, 05:22 PM
#3
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a nylon washer will work but not sure if they left the engine factory with them or if they used a brass or other soft metal for a seal
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babbah (12-05-2016)
11-20-2016, 05:44 PM
#4
Melting Slicks
I like the copper washers, you can buy an assortment at your local parts store for a couple of bucks.
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babbah (12-05-2016)
11-20-2016, 06:04 PM
#5
Race Director
Back in the 1960's most cars used a copper or copper-clad gasket/washer for sealing. In the 1970's I know that GM went to the white nylon type. GM Part Number #3921989 (box of 20).
Larry
Larry
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babbah (12-05-2016)
12-05-2016, 02:08 AM
#6
Melting Slicks
Thread Starter
I see that there are copper oil pan washers with rubber centers to seal the oil drain plug.
What size do I need for the 437 oil drain plug?
The diameter of the plug that I need?
What size do I need for the 437 oil drain plug?
The diameter of the plug that I need?
12-05-2016, 09:04 AM
#7
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The Fel-Pro part number for the nylon washer is 70822. The drain plug is a crush-type seal, therefore the gasket needs to be nylon, copper, aluminum (or other soft material) to conform to the shoulder of the drain plug and mating surface of the pan. I suspect the original-issue gaskets were metal, and nylon emerged as the service part later in time.
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babbah (12-05-2016)
12-05-2016, 11:09 AM
#8
Race Director
The Fel-Pro part number for the nylon washer is 70822. The drain plug is a crush-type seal, therefore the gasket needs to be nylon, copper, aluminum (or other soft material) to conform to the shoulder of the drain plug and mating surface of the pan. I suspect the original-issue gaskets were metal, and nylon emerged as the service part later in time.
That is the way it went................copper/copper jacketed asbestos and then nylon. Later on the metal outer ring with rubber inner seal arrived.Larry
12-05-2016, 01:54 PM
#9
Melting Slicks
This is an original 3866916 magnetic drain plug for 65-66 and many 67 big blocks.
Last edited by Critter1; 12-05-2016 at 05:38 PM.