Larry,
The response thread seemed to deal more with valve adjustment than with your
original calamity. If you are breaking rocker arms and bending pushrods, I
would suspect binding valves. Since you don't know the history of the
rebuild, it's possible the valve guides were not properly installed and do
not have adequate clearance - or maybe after 10 years of sitting, they are
just bound up. Another possibility is cam timing that is far enough off
that you are getting interference between pistons and valves. Not sure if
that's possible on this engine. Given what you said, I think you can count
on having to remove the head to look for damage and to determine the
condition of the head overall.
Mark Anderton
72 TR6
Virginia Beach
----- Original Message -----
From: "Lawrence Brown" <larryandrobin@charter.net>
To: <6pack@autox.team.net>
Sent: Sunday, May 04, 2003 7:36 PM
Subject: broken rockers,bent pushrods
> Hello Listers,
> I have a '74 TR6 that I've been trying to wake from a 10 year stalled
> restoration. The previous owner said the engine had been rebuilt, and it
> appears so. After cleaning out the entire fuel system and carbs of
jellied
> gasoline I got it running, not great, with a few backfires. Oil pressure
100
> lbs., which came down to about 60 in 10 minutes. When I went to start it
> again today, there was valve clatter immediately, and I shut it down. I
have
> 2 broken rocker arms and at least 4 severly bent pushrods. Can anybody
tell
> me what happened? Can 3 or 4 backfires damage the valve gear so badly?
Do
> you suspect the oil feed to the rocker shaft? Can carburation or timing
> errors cause this?
> Any ideas would be greatly appreciated. I've done over 100 separate
jobs
> to this car, and have yet to ride one block. Its getting depressing.
>
> Larry Brown
> Asheville,NC
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