From digest.v6.n887 Wed Jul 16 16:11:08 1997
From: Don Eilenberger <deilenberger_at_monmouth.com>
Date: Tue, 15 Jul 1997 21:53:21 -0400
Subject: RE: m30 Spark plug gap and injector seals
At 08:43 PM 7/15/97 -0500, Douglas L. Donsbach wrote:
>Don Eilenberger <deilenberger_at_monmouth.com> wrote:
>> As far as seating the injector seals - and also getting them to last
>> FOREVER - I've used silicone vacuum (or stopcock) grease for years..
>> this is an excellent rubber lubricant and more importantly - anti-oxidant
>> (for those of you living in ozone heavy areas - like Southern CA)..
>The only problem with this solution is that silicone sealants are usually
>the death of O2 sensors and unless the sealant you are using says it is
>O2 sensor safe you are likely to accelerate failure of that component.
Doug - if you read the post carefully - note - I said it should only
be rubbed into the rubber, not slathered all over the seal.. and
FWIW - the silicone vacuum grease is non-outgassing, ie - it is
made for use on O rings in a high-vacuum environment - much higher
vacuum than your car engine could ever hope to achieve. Any outgassing
in the high-vacuum environments it is used in would cause instant
contamination of the systems - a much bigger problem than a fouled
You also will note that I said *NOTHING* about a sealant - what I
mentioned was a silicone based vacuum GREASE.
The problems that have been reported have been with silicone sealants
being used - and they are entirely different beasties than a high-vacuum
silicone grease. They WILL out-gas - it's part of their curing process.
The gases given out could coat the O2 sensor rendering it senseless..
Do what you may - I've used the Dow-Corning Vacuum Grease on injector
seals many times with no problem at all - but of course YMMV (and it
Please READ the posting before firing off the hip (although I have
once in a great while done the same thing..)
Spring Lk Hts, NJ, USA
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