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Small engine mounting stud - bottom rear

Submitted by john_young1 on Tue, 30/05/2017
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Heavy Twins

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

Submitted by robert_tuck on Tue, 30/05/2017

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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.

Submitted by john_young1 on Tue, 30/05/2017

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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.

Submitted by Xanna_jeannett… on Tue, 30/05/2017

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Hello the proper way is to remove the four nuts and bolts on the rear of the gearbox plates to the frame and the bottomfront engine stud that goesall theway 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 Annaj

Submitted by neil_wyatt on Tue, 30/05/2017

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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.

Submitted by gordon_johnston on Tue, 30/05/2017

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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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