Starter motor adapter thickness MkIV

[Richard B]

Anyone know how thick the aluminium adapter is supposed to be on a 4 pot.

We have wrecked two starter motors in Jessica's Coupe where the pinnion has kept jamming.  :'(

The flywheel is from a MkIV 1300 Spitfire afaik. The engine is a 1500 Spitfire.

The starter is free when fitted, but will not dis-engage.  


I can see the gearbox coming out again.

[heraldcoupe]

I don't know the answer, but it should be easy enough to measure from first principles.
Measure the distance from the back of the ring gear to the face the motor mounts against.
Now measure the distance between the motor's mounting face and the engaging face of the pinion at full throw.
The difference between the two is the nominal thickness of the spacer, with a little subtracted to give clearance,

Cheers,
Bill.

[Velocita Rosso]

Just seen this Richard
Just put a new motor in.....will measure in the morning(I aint going outside again tonight ;))

[Velocita Rosso]

In foreign talk 10 mm or as best as I can see near to 3/8" in old money( the recessed portion is around 1/8" that sinks into the back plate/bell housing)
That`s with a 1300 flywheel and it works and has done for ages without a problem

[Richard B]

Thanks, It looks like a strip down and investigate job.

Looks like a change to a 1500 O/D box is on the cards at the same time. Then it can have a 1500 flywheel & clutch as a complete package.

[heraldcoupe]

Remember that shims were used as-required for optimum clearance, in addition to the alloy spacer. If the installation in question needed a couple of shims that weren't fitted, a jammed pinion would be a likely outcome.

Cheers,
Bill.