Thread: Isuzu Gearboxes

Originally Posted by garryseries3

Rang around the wreakers was informed that the MSA-5G gearboxes are a 21 splined and larger (c.f. 23 splines on earlier versions) This as you say is not an issue if using a new clutch plate which I will. But he said that the imput shaft was longer and th starter motor is bolted to the bell housing of the box not the engine this I am not sure about so hoping you can clarify these aspects of using the MSA-5G model box.
Kindest regards
Garry

A rearward facing starter means the box was fitted to a 4H series engine. It would need a bellhousing swap to fit a 4B series.
I can give you some measurements for the input shaft to compare to what I have. Hopefully they didn't change that for the 4H also.

Originally Posted by garryseries3

That would be good Dougal am intending to go up later this week and see what he has available. Thanks
Garry

It's not as easy to get those measurements as I'd thought. My spare gearbox is still buried in a shipping container from my last relocation.
But I get 167mm on my solidworks model from the front face of the gearbox (i.e. excluding bellhousing) to the front of the spigot bearing in the flywheel.
The flywheel is 12mm thick at this point and the pocket in the crank is another 30mm deep.