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Posting-Version: version B 2.10.2 9/18/84; site bonnie.UUCP
Path: utzoo!watmath!clyde!bonnie!saf
From: saf@bonnie.UUCP (Steve Falco)
Newsgroups: net.auto.tech
Subject: spark plug deposits
Message-ID: <643@bonnie.UUCP>
Date: Tue, 3-Dec-85 08:14:37 EST
Article-I.D.: bonnie.643
Posted: Tue Dec  3 08:14:37 1985
Date-Received: Thu, 5-Dec-85 04:42:59 EST
Organization: AT&T Bell Laboratories, Whippany NJ
Lines: 21

I had to bring my Chevy to the dealer for a rear brake recall (the one
where the wheel cylinder falls out tangling up the brake shoes and
causing a loss of brake fluid).

I asked him about the white, crusty deposits I had on two adjacent
spark plugs in my 305 V8.  (Cylinders 6 and 8.)  He said "No problem,
sounds like antifreeze is getting into the cylinders.  Probably just
a blown gasket or a crack somewhere."  NICE!!

A few people have responded to my first posting saying that the deposits
could be caused by oil additives.  I don't use any special additives
but of course there are some additives in any oil.

Can anyone offer a way to determine whether the deposits come from oil
or antifreeze?  Pulling the heads is a bear!  BTW, the engine uses a
quart of oil in 1000 miles.  This can go up to a quart in 250 miles when
driven hard.  I suspect the oil consumption is at the valve stems since
compression was OK - wouldn't they all wear evenly causing deposits on
all plugs rather than just two?

	Steve Falco