Brent,
The knocking sound could be a loose timing chain gear. When you rebuilt the
engine did you use the locking tabs on the bolts on the large timing gear? If
not this could cause the bolts to loosen and wear causing the chain to slap
against the timing chain cover. My 79 made the same kind of noise at idle. It
is an easy fix to replace the chain and bolts, but an expensive repair if the
chain snaps.
John Reynolds
Houston, Texas
1979 Spitfire FM966640
1967 BSA Spitfire A65SA16748
-----Original Message-----
From: BJ Martin bj_martin@hotmail.com
Sent: Mon, 13 Dec 1999 12:41:19 PST
To: spitfires@autox.team.net
Subject: engine noise
My '77 Spitfire has a problem. It has a fairly loud "knock" (konk, konk,
etc.). It is really bad right at start up and then gets less bad as the
engine warms up. It nearly disappears after the engine has run for several
minutes but is still there if you know what you are listening for. The sound
is fairly consistent but it is not real regular (meaning that it is sort of
happening all the time but does not seem to correlate with the engine
cycles... not Konk, konk, konk but konk, konk.. konk ..konk, konk, konk...).
It is clearly coming from the front of the engine and way easier to hear on
the manifold side. It has been getting worse over the last several months.
Other background: the car gets driven little (maybe 50 miles a month), I
rebuilt the engine about 4 years ago (my first and only but it was a pretty
thorough job), It runs strong, oil pressure is good and unchanged from point
of rebuild (75# when cold and when at speed), no oil use, no leakage of
anything but a little water disappears every once in a while, all stock
including emission controls, water choke and high beam switch don't work but
everything else does.
What's up and how do it tell?
thanks, brent
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