Thread: MSA Clutch Throwout

Give me a couple of days as i'm away and I'll measure the one I have af home, its new from isuzu and to suit the 300mm clutch

Thanks Vern. I might have found one. The box I have is a MSA 5G which has a bigger input shaft than the earlier boxes. Hard to get info from the Isuzu dealers. They want Truck numbers not descriptions. When it arrives I will post the info .

The MSA 5G i have is 35mm, the throw out assembly i bought to suit the 300mm clutch is pn. 8944608250. The one that came with my box must of been for the smaller 275mm clutch, it is a lot smaller.

Isn't the 4 speed (lt95) 40mm?

This one came by courier yesterday. Its 8-97089652-0
The bearing surface that contacts the fingers is a bit bigger than the old one but I have yet to fit it and see how it goes. If necessary I can turn up a sleeve that fits inside and make it a light press fit.

mines completely different to that, its more like your old one but bigger. The old one looks like the one to suit the smaller clutch.I gave isuzu the vin number off a factory 4bd1t NPR59, so it has the larger clutch. Will see if i can get photo's later

Originally Posted by 123rover50

This one came by courier yesterday. Its 8-97089652-0
The bearing surface that contacts the fingers is a bit bigger than the old one but I have yet to fit it and see how it goes. If necessary I can turn up a sleeve that fits inside and make it a light press fit.

Here, early 4BD1's used a 275 mm clutch plate. Then the diameter was increased to 300 mm.

I needed a later clutch plate with 21 spline hub to use a 6 speed MXA Isuzu box behind my 89 4BD1T.

From 4/1990 the spline in the hub was increased to 21 teeth, 29 mm O.D. - presumably simply because they changed gearboxes from MSA to MXA.

Exerdy clutch listed 2 possible release bearings in the later models (single unit, or replaceable bearing) - I assume this is what you show in those pics.

My MXA had the replaceable bearing. I'm sure it has the large bore you need - being the larger MXA gearbox.

Yes this box has 21 splines. I suppose its an MSA. The Grubbs adapter fits it OK. The Throwout bearing is too big for the pressure plate fingers so as I was thinking of making a sleeve to reduce it I looked at the old one. The size of the inner looked close so I got the angle grinder and cut it up. Low and behold the inner ballrace was a tap fit inside the new one. This reduces the diameter and gives a nice rounded surface for the fingers to bear on.
Put this in the notebook for future reference