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10-20-2014, 11:26 AM | #1 |
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1942 Crab Distributor Vacuum Seal
What is the seal between a crab distributor and the engine block? My crab developed a wicked vacuum leak from that seal failure. I never heard an engine run so bad!
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10-20-2014, 12:15 PM | #2 |
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Re: 1942 Crab Distributor Vacuum Seal
I believe that there is supposed to be a gasket between the crab dist. and the timing cover.
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10-20-2014, 12:21 PM | #3 |
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Re: 1942 Crab Distributor Vacuum Seal
There should not be a great deal of vacuum at the distributer - timing cover interface. If there was it would be sucking oil into the distributer and back up into the carb base like a PVC. The vacuum is from the carb base to the vacuum brake.
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10-20-2014, 12:34 PM | #4 |
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Re: 1942 Crab Distributor Vacuum Seal
The vacuum is sealed by two rubber rings that look like O rings. One goes into the timing rear cover, the other in the side of the distributor that faces the timing gear cover. They are usually included in a distributor gasket set. You can use O rings of a proper size top fit the cavity. I haven't seen them sold separately. The whole gasket set is only $8 at C&G.
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10-20-2014, 12:49 PM | #5 | |
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Re: 1942 Crab Distributor Vacuum Seal
Quote:
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10-20-2014, 01:39 PM | #6 |
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Re: 1942 Crab Distributor Vacuum Seal
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10-20-2014, 02:41 PM | #7 |
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Re: 1942 Crab Distributor Vacuum Seal
I don't think there is an o-ring recess in the timing cover, just a flat face onto which the gasket mounts. The seal in the distributor sticks proud a few thou to form a seal against the gasket.
Mart |
10-20-2014, 03:14 PM | #8 |
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Re: 1942 Crab Distributor Vacuum Seal
I use a section of the right size vacuum hose cut squarely to the right length to just protrude about 1/16" so it crushes flush to the timing cover when the distributor is bolted up. Bruce
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10-20-2014, 03:45 PM | #9 |
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Re: 1942 Crab Distributor Vacuum Seal
What Bruce just said. Dig the old seal out and grab a 2 inch long piece of fuel hose or
vac hose , so you have something to hang on to, and work it in to the recess. Trim like bruce says with something real sharp. Charlie ny |
10-20-2014, 07:29 PM | #10 |
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Re: 1942 Crab Distributor Vacuum Seal
Thanks All. Problem fixed and on to the next fun task!
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08-13-2015, 03:10 PM | #11 |
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Re: 1942 Crab Distributor Vacuum Seal
Sorry to re-open this thread. I have a Bubba crab for my 59A which has the long snout cam so I needed the spacer from Speedway which came with 2 gaskets ....one for the spacer to the timing cover and one for the dist. to the spacer. Will I need the cork gaskets? See image
Thanks, Phil |
08-13-2015, 03:30 PM | #12 |
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Re: 1942 Crab Distributor Vacuum Seal
I think you are talking about the gaskets for crab cap and 59A cap and gasket...
Many non original caps lack the necessary recesses for those. Look at the parts catalog diagram, then see if they will go in! |
08-14-2015, 11:07 AM | #13 |
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Re: 1942 Crab Distributor Vacuum Seal
Is there a gasket that fits into the recess of the spacer/adapter? Only the paper surface gasket was included.
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08-14-2015, 12:26 PM | #14 |
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Re: 1942 Crab Distributor Vacuum Seal
Use paper gasket on both sides ......
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08-14-2015, 01:31 PM | #15 |
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Re: 1942 Crab Distributor Vacuum Seal
Thanks, Jim. That's what we did. just wanted to be sure before we cranked it over.
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