[TR] Strange Vibration/update

bill beecher bill_beecher at flash.net
Tue Jan 21 15:35:00 MST 2020

Thank you List,

Found excessive runout on the front driveshaft (engine-to-trans), this one is turning full-time whether the clutch is depressed or not.  Spent $30 at the machine shop and I am back in business.  Thanks to all who responded with real good comments.



From: DAVID MASSEY [mailto:dave1massey at cs.com] 
Sent: Tuesday, January 7, 2020 5:06 PM
To: bill_beecher at flash.net; triumphs at autox.team.net
Subject: Re: [TR] Strange Vibration


When the clutch is depressed the rest of the drivetrain is out of the picture so everything points to the engine.  


If one of the clutch cover bolts is missing the imbalance may be quite pronounced.  Let's hope it is something easy like that.





-----Original Message-----
From: bill beecher <bill_beecher at flash.net <mailto:bill_beecher at flash.net> >
To: triumphs <triumphs at autox.team.net <mailto:triumphs at autox.team.net> >
Sent: Tue, Jan 7, 2020 4:51 pm
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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