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Question Thru Bolt O-rings

In reading the engine rebuilding book by Wayne I read that black silicon can be used on the thru bolt o-rings. Should it be used on the o-ring on the bolt head side and the nut side? The pics in the book only show it on the bolt head side. Is it the recommended way to go?
Old 12-14-2005, 11:05 PM
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I'm in the process of rebuilding my '87 930 and I am NOT planning on using the black silicon. I've also read/heard that the blue o-rings are useless...try to find the green ones that I think might have been used on the 964 (not sure about the 964 part, but they are green).

Jeff
Old 12-15-2005, 04:57 AM
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I got some o-ring lube (thanks Henry) and the green o-rings for my rebuild. Works great and non of that oozing of the o-ring after torque (unlike some of the blues I've seen). I think the green ones are cheaper than the blue ones also. Henry sells them for like .50 each.
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Old 12-15-2005, 02:45 PM
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I'll look for the green o-rings. What kinkd of o-ring lube did you get porschett?
Old 12-15-2005, 02:59 PM
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When I was in the Jerry Woods engine rebuilding course he used Down Corning 111 as O ring lube.

Cheers,

Mike
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Old 12-15-2005, 03:40 PM
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The O-rings that come in the gasket kit are blue - and suck. Get the green ones from Henry or EBS and lube them up with some Dow Corning 111. The 964 gasket kits come with the blue O-rings also but they seem to work OK in that application.

Perhaps Ralph can weigh in on what Andial uses for sealants.
-Chris
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Old 12-16-2005, 05:35 AM
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Wo ist die Rennstrecke?
 
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I used the blue o-rings from EBS (in their rebuild kit) and black sealant as recommended in "the book" for two rebuilds with no problems.
Old 12-16-2005, 08:13 AM
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Last year I said to my buddy (who's built a lot of 911 motors) "I've used the blue O-rings for years and never had a problem." He told me: "Yes you did, you just didn't know it."

This is what can happen to the blue O-rings on the unbevelled side of the case through holes:



-Chris
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Old 12-16-2005, 08:30 AM
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Wo ist die Rennstrecke?
 
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Good pics. On the other hand, if there are no leaks, what's the difference or problem? Personally, I don't care about those blue thingies - no one sees them.
Old 12-16-2005, 11:46 AM
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I've used the blue ones for years as well.

The key is to make sure the washer doesn't spin when you torque down the through-bolt nuts. The washers are so soft and pliable, if the washer spins, it'll tear the o-ring up.

I have a helper hold them with a pair of needlenose... (That said, I use the greenies now for 1-man operation)
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Old 12-16-2005, 03:22 PM
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I just ordered a set of greens from EBS.
Old 12-16-2005, 10:07 PM
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Dow 111 can be hard to find and for the amount you use the tube will out last uranium. I used Curl-T on mine. it lubes and seals worked great. The nut end gets the most twisted up from the torquing.
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Old 12-17-2005, 10:05 AM
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MSC carries it http://www1.mscdirect.com/CGI/NNSRIT?PMPXNO=1848217&PMT4NO=3400932


It's ideal for oil return tube O-rings and such. I just use 30W oil on the through bolt O-rings but I don't see why DC 111 wouldn't work even better.
-Chris
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Old 12-17-2005, 10:29 AM
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I bought a pound of "knock off 111" from http://www.sspinc.com/prodspecs/prodspecs.cfm?spec=1212specs
Currently $19.95 for 1# tub...

Basically the same stuff as 111 per their data sheets vs. Corning's . Probably will last me a lifetime of "O-ring" lubing... Lou
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Old 12-17-2005, 12:59 PM
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