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05-03-2018, 10:48 PM | #1 |
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Join Date: Sep 2010
Location: South Coast NSW Australia
Posts: 2,596
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Crab vaccuum brake rubber seal
I dug out the remains of the seal between the crab body and the block and found it to be about 1/4 inch deep.
Obviously too deep for an O ring. I guess the seal is like a short cut piece of rubber pipe? |
05-04-2018, 02:13 AM | #2 |
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Join Date: May 2010
Location: Solihull, England.
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Re: Crab vaccuum brake rubber seal
Yes, if you can't source a genuine part, you can use a piece cut from a suitable rubber hose. I did it, it took a few tries to get one I was happy with, but it is do-able.
Mart. |
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05-04-2018, 10:42 AM | #3 |
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Join Date: Jun 2010
Location: Marana, AZ
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Re: Crab vaccuum brake rubber seal
I seem to remember an earlier post by Charlieny on this topic. I needed a seal at the time, followed his advice with a piece to rubber tubing, and it worked like a charm. Can't recall the timing of the post, but it was a couple of years ago.
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05-05-2018, 04:20 PM | #4 |
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Join Date: Oct 2015
Location: Bonita, CA
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Re: Crab vaccuum brake rubber seal
Why use it? All it does is slow down the advance on an already anemic advance curve.
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05-05-2018, 06:01 PM | #5 |
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Join Date: May 2010
Location: Solihull, England.
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Re: Crab vaccuum brake rubber seal
It steadies the mechanism. Light drag is better than no contact. It isn't like a modern setup with return springs. there are springs but it requires the slight drag to keep it all settled.
Mart. |
05-06-2018, 02:50 AM | #6 |
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Location: South Coast NSW Australia
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Re: Crab vaccuum brake rubber seal
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05-06-2018, 10:16 PM | #7 |
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Join Date: Oct 2015
Location: Bonita, CA
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Re: Crab vaccuum brake rubber seal
OK, so how do you adjust for a slight drag? In all the way and back out how much?
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05-07-2018, 01:33 AM | #8 |
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Join Date: Sep 2010
Location: South Coast NSW Australia
Posts: 2,596
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Re: Crab vaccuum brake rubber seal
I found it took very little suction to draw the piston back.
I doubt there would be much drag on it anyway once the engine started and even under acceleration.. Handy to have a bit of drag /retard /non advance tho, when occasionally I have to hand crank the sucker. |
05-07-2018, 07:26 AM | #9 | |
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Join Date: May 2010
Location: SPEEDWAY INDIANA
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Re: Crab vaccuum brake rubber seal
Quote:
On our rebuilds we turn all out and then in three turns for contact. Seems to work until it can be properly adjusted on the car.. |
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05-07-2018, 09:29 AM | #10 |
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Join Date: Oct 2015
Location: Bonita, CA
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Re: Crab vaccuum brake rubber seal
OK good but how would you adjust it on the car? Is it the same for helmets?
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05-07-2018, 02:41 PM | #11 | |
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Join Date: May 2010
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Re: Crab vaccuum brake rubber seal
Quote:
And a helmet would be the same issue......... |
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