[Fot] Assembling new engine with old crank pulley - timing mark 12-15 degress off - why?

[Richard Gehweiler]

Scott,
Sometimes the vulcanizing bonding the rubber to the inner and outer metal
parts of the vibration damper lets loose. The two parts can then move in
relation to each other. I was timing an old British car once and I could
actually use the timing gun to watch the timing marks rotate around the
crank as the engine ran. Needless to say it was not possible to time that
car as it was, had to replace the vibration damper.

Richard Gehweiler
mini at wi.rr.com
1.262.894.5460


-----Original Message-----
From: fot-bounces+mini=wi.rr.com at autox.team.net
[mailto:fot-bounces+mini=wi.rr.com at autox.team.net] On Behalf Of Scott Janzen
Sent: Saturday, April 19, 2008 12:14 PM
To: fot at autox.team.net
Subject: [Fot] Assembling new engine with old crank pulley - timing mark
12-15 degress off - why?

I am assembling a new GT6 engine, re-using the vibration damper/crank pulley
that was fitted to the previous engine - TDC marked on my flywheel, triple
checked with dial indicator, etc.  Fitted the old damper/pulley and the TDC
mark is off by about 12-15 degrees.  did the keyways on the cranks vary that
much in location from Triumph or am I missing something?  Since it was in
the
correct location on the old engine I doubt the exterior casing of the damper
has slipped
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