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case o rings- is this normal?
I am finally beginning the assembly of my motor and have read everything I can find on this forum and in Wayne's book. I assembled the case without the o rings and am going to remove 1 bolt at a time and add the o rings. After I did the first one I took it back apart to see if the o ring looked ok and I found that a small area of the o ring had gone slighlty into the case. I wouldn't think this is normal but I thought I would ask the experts here. The o rings, the bolt and washer were all lubed with dow 111 grease. Any help would be greatly appreciated.
Thanks Greg 
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08-20-2012, 05:21 PM
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Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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case
Greg, many of the cases we see do not have the proper chamfer to do the job, especially with the green viton seals, look at the holes and be sure they have it
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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08-20-2012, 05:58 PM
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Location: Mount Airy, MD
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Has anyone tried something like this? If there isn't enough chamfer and the case is already assembled...
McMaster-Carr t
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1967 912 with centerlocks… 10 years and still in pieces! |
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08-20-2012, 07:00 PM
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I bought a simple chamfer tool at harbor freight to cure the problem I had with the seals squishing out from under the steel washers- just be sure to block the through-bolt passage from the other side before you chamfer the hole, and be sure to clean/blow out all the little metal bits that result from the chamfering, and be sure to take it slow and easy to make sure the chamfer is nice and smooth... it seems that one side of the case is always worse than the other, so you can use a good chamfered hole as a reference for how far to go.
Curt
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66 912 ... 2.7 conversion (What a blast!) 79 928 5-spd (sadly, sold) 85.5 944 5-spd (sadly, traded for 928) www.curtfranklincreative.com |
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08-21-2012, 06:38 AM
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Thank you for your responses. It seems everyone thinks chamfering is the answer. My case is only chamfered on the bolt head side currently and from what I have read most cases seem to be that way. I guess the factory somehow got these to seal properly without the chamfer but I am not having any luck. Once again thanks for the help!
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08-22-2012, 06:43 AM
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I had a problem with the green O rings, they wouldn't let the washer sit against the case, this is because of the case doesn't have the chamfer like yours. The best thing is to chamfer the case, but in my case I didn't want to do that with the case together so I used the blue O rings they are softer and will crush, you may see some of the ring squeeze out from under the washer.
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08-22-2012, 08:03 AM
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Location: Central Fla
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Chamfer
The blue "O" rings are softer and thats how it worked without the chamfer.
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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08-22-2012, 08:58 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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Per Mike Bruns' advice on this forum to countersink the thru-bolt bores, I got one of these countersinks to do my case. McMaster-Carr Just one side of my case wasn't c-sunk.
No leaks with the green rings. I'm slow. So I assemble the case and then go back to do the o-rings one bolt at a time.
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Kevin L '86 Carrera "Larry" |
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08-28-2012, 10:15 AM
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930
912-6
