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Small engine mounting stud - bottom rear

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Small engine mounting stud - bottom rear

Posted by john_young1 at May 30. 2017

Hi all, just joined the club as I have acquired a 1960 99.

Probably the first of many questions...

The small stud that goes through the crankcase and the very bottom of the rear engine mounting plate on my 99 has lost a nut from one end and someone has damaged the thread trying to put it back on, leaving a loose stud.

Since the lower frame rails prevent the removal of this stud, is it possible to somehow loosen and 'jack up' the engine to replace it, or is it an engine out job?

Thanks for any help or suggestions

Re: Small engine mounting stud - bottom rear

Posted by robert_tuck at May 30. 2017

Take a nut, saw it in half  from face to bottom ,tidy the threads ,clamp in on the damaged thread with a mole . wind it off and leave the thread ready for use.

Re: Small engine mounting stud - bottom rear

Posted by john_young1 at May 30. 2017

Unfortunately it's a stud with another loose nut on the other end so there's no way of winding the thread cleaning nut off.

Good idea though, I'll store that for later...

i did think about welding a nut on the damaged end to effectively make it into a bolt. It only needs nipping up so it should only need a tack.

Re: Small engine mounting stud - bottom rear

Posted by anna jeannette Dixon at May 30. 2017

Hello  the proper way  is to remove the four nuts and bolts  on the rear of the gearbox  plates  to the frame  and the bottom front  engine stud that goes all the way though  has two nuts at each end  then jack up the gearbox end  so you can remove  said stud  and replace  it with  a 5/16 cycle thread  stud  you can make one like I did  it's easy if you have the right tooling    have fun     yours   Anna j

Re: Small engine mounting stud - bottom rear

Posted by Neil Wyatt at May 30. 2017

Anna is quite correct, I had this problem with my 650 some years ago, I left it to my son to ensure the engine fastenings and studs were in place and of course the one that is trapped by the frame he'd forgotten about.  I recommend a block of wood between the engine and jack. I was able to do the job with the jack at the back of the engine.

Putting the engine back in place was another matter, took a thick plank of wood and a big hammer to move it back down.

Oh, now I think, I had to remove the oil tank and battery box too.  Remember the engine a g/box are pivoted on two loose front engine mountings supported by the jack at the rear.

Re: Small engine mounting stud - bottom rear

Posted by john_young1 at May 30. 2017

Thanks for the advice & info. I think it might be worth doing properly, at least it's not an engine out job.

Re: Small engine mounting stud - bottom rear

Posted by Gordon Johnston at May 30. 2017

When you do have to remove the engine, it might not be a bad idea to cut these holes into slots. That way any future engine removal can be done without removing the gearbox.

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