Rear Engine Mount

Quick question for the memebership, I have taken apart my 71 LR Fastback for sandblasting however there is one part I'm having trouble with. The rear engine mount is still affixed to the motor. I do believe that the primary inner and outer have to come off to take the top bolt out. The engine is presently on the garage floor on a old blanket with the outer cover off.

In the event that the stator, clutch et al has to come off, is there a trick in locking the motor to take off the nut for the rotor thus taking apart the guts to get that last part to the sandblaster.

Cheers,

I would just take the rotor nut off with an impact wrench in seconds, will vibrate it right off and don't need to lock the motor up.

^^ What he said. Or stuff a rope down a spark plug hole to keep the piston from moving.

maylar said:

Or stuff a rope down a spark plug hole to keep the piston from moving.

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Tricky business, be sure you take the combustion stroke otherwise you might bend a valve! Better take the easy way: shift to fourth gear and press the rear brake pedal (as your bike has been taken apart this is not an option I guess).

canadiancopper71 said:

In the event that the stator, clutch et al has to come off, is there a trick in locking the motor to take off the nut for the rotor thus taking apart the guts to get that last part to the sandblaster.Cheers,

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You can use a sprag between the engine sprocket and clutch sprocket. This is a bar of either hard wood or soft metal, ideally aluminium wedged in the root of the sprocket teeth so as the engine is trying to turn anti-clockwise with the wrench, the sprag is pushing the clutch clockwise effectively locked by the chain between the two. The sprag fits onto the engine sprocket about the 4 o'clock position and on the clutch about the 10 o'clock position. Depending on the chain tension spacing between the two, a bar lenght of 125mm to 130mm will be close enough. A short sprag can also just go from the engine sprocket to the cast boss on the inner primary case of the central fixing stud, but I don't like that method as the force could possibly fracture the boss.

Mick