[TR] Strange Vibration

jpaynepbr at cox.net jpaynepbr at cox.net
Tue Jan 7 17:33:40 MST 2020



I purchased a TR3 a few years ago with a freshly rebuilt motor.


Whoever put that motor together overtightened the 4 bolts holding the
flywheel to the crankshaft.  They broke.


Flywheel came off the back of the motor and destroyed the transmission case
in spectacular fashion.  I'm lucky to have escaped injury.


Those Morgan clutch pressure plates have 3 "fingers" on them that the
throwout bearing presses against.  I believe it is the same as an Austin
Healey 100 clutch - I've seen a few Morgans and AH's that had one or more of
the fingers missing, which would throw things out of balance - they are held
in place with a pretty fragile spring. 



From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of bill beecher
Sent: Tuesday, January 7, 2020 2:51 PM
To: triumphs at autox.team.net
Subject: [TR] Strange Vibration


Not quite a TR but an older Morgan with the TR3A motor and Moss gearbox.  I
have a vibration that I can feel all the time but really is strong at the
2500-3000rpm range.  With the clutch in it is still there, when driving it
is worse.  Drive shaft is straight and balanced, makes no difference with
the wheels removed.  Have pulled the front pulley and put a gauge on the
crank end, no wobble.  Engine mounts are tight.


Prior to installation I ran the motor without a driveline extensively just
in the chassis and all was good, is it possible for a clutch plate to be
off-balance so much as to cause a noticeable vibration?


Just fishing for any suggestions before I pull the motor and recheck the
flywheel/clutch assembly.






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