[Mgs] backing up shudder

[PaulHunt73]

Any above plus oil on the clutch.  Mine started only after clutch replacement, which was annoying, and has been doing it for 50k.  I  just use higher revs then I normally would when slipping for reversing, others say lower revs reduces it.  C'est la vie.

PaulH.
  ----- Original Message ----- 
  From: mgbob--- via Mgs 
  To: mike at duvallvideo.com 
  Cc: mgs at autox.team.net 
  Sent: Saturday, June 20, 2015 9:39 PM
  Subject: Re: [Mgs] backing up shudder


    Welcome back to the judder club.  
    In the TD, causes can be all you listed:
     Front mount-possible, I suppose you could use a pry bar gently and life engine to see if rubber has un-stuck from the metal. Originals lasted 50 years. Today's improved replacements about 1/5 of that. Lift gently, though, as you don't want to cause separation if it has not already happened.
    Stabiliser-check that movement of engine is about 1/8 inch, which is about the "give" in the rubbers. If more, look further, to adjusting the bar if there is evidence that the turnbuckle has moved (not likely), and inspection of the rubbers. 
    Transmission mount--from underneath, push up and pull down on the gearbox tail or at the flange. There should not be much movement. If the rubbers are bulged and cracked, they may be bad. Changing them is not complicated, but can be time taking and messy. Oil mess from engine is usual cause of their deterioration, though. No need to remove it; just shove the gearbox around to judge free movement, of which there should be less than 1/8 inch. 
    Axle U bolts--the usual cause. If you have not already installed those wear plates on top of the axle, remove one bolt and feel for groove worn where the U bolt passes over axle tube. Buy a pair of the wear plates if there is any groove, and not a bad thing to have them installed anyway. MGA and later had them on the axles from new.
    Best of luck finding it--this can be a challenge. I have been chasing it for a decade.
  Bob


  ---------- Original Message ----------
  From: Mike Duvall via Mgs <mgs at autox.team.net>
  To: mgs at autox.team.net
  Subject: [Mgs] backing up shudder
  Date: Sat, 20 Jun 2015 12:28:20 -0500


  Both my A and TD started jumping or shuddering when backing up.    I had this happen before-  seems odd it started again on 2 cars but coincidence I'm sure.

  I searched and can't find much so I want to know if I'm missing anything.

  Possible:
  front engine mount
  transmission mount  (do I have to take it out to see on the TD?) 
  axle U bolts 

  TD engine stabilizer

  TD clutch (seems like might have been the problem last time but what do I adjust here)


  Other ideas or what am I missing?   I read pilot bearings but were replaced so I doubt much wear. 

  Thanks, Mike
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