If I understand this, you burned 2 quarts of oil in 100 miles. If that is
correct, I am surprised you did not get pulled over by the police for
pollution. Two quarts of oil in 100 miles would have left a smoke screen
large enough to hide a battleship.
If you did not see such a smoke trail, I would suspect that you need to look
for another place the oil went.
Cheers,
Joe
-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of akgraves@cox.net
Sent: Tuesday, September 15, 2009 8:44 AM
To: triumphs@autox.team.net
Subject: [TR] Burned Exhaust Valve
I wrote a few weeks ago after replacing piston rings and rod bearings. That
repair seems to be good - so far. This past weekend I drove 100 miles to a
car show and it seemed to run okay but the fuel economy was poor. Then I
discovered that my oil level was very low. I topped up and checked it again
on my return (100 miles) and discovered that I had burned 2 quarts! It did
not leak out. A compression test showed 0 lbs on cylinder 6. That's where
the oil went. #6 plug was caked with oil and soot as well. Thinking I had
a
head gasket failure or new piston ring installation errors I removed the
head.
The gasket looked good, nothing obvious, and the cylinder walls looked good.
Thinking that the head must not have been torqued properly, I began cleaning
my tools and shop for the next day. Then I noticed a gaping hole in the #6
exhaust valve. I removed it and there is a 5/16'' chunk missing! My
question
is what could have caused that? During the previous work I removed the head
and inspected and cleaned all valves and lapped them into their seats. They
looked good then. I plan to drive to Triumphest and need to know what
happened so that it doesn't happen again.
Thanks,
Art Graves
Tulsa, OK
1976 Triumph TR6
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