Thread: Isuzu MSA Gearbox to LT230

Bad pic, but does this show torque twist?
Would this have broken later even if there wasn't a weaker point at the step to oil seal?

Would this indicate that the outcast adaptor, being more ridged from taper, would fail close to the spline? (like axels are made to be able to twist over length and then return.) I know this all a big what if, especially with material quality being questionable.

Verns earlier picture with double splined shaft would address twist more betterer?
Short, but better than nothing.

http://i1298.photobucket.com/albums/...ps84354686.jpg

Boof after reading your post I think you may have started at the wrong end. The first step should be to determine if the face that bolts to the GB is flat and the bearing recess is a snug fit on the bearing till this is checked and corrected if need be any other alignment checks are pointless I have on here some where a post on further steps

AM

AM,
Yes i agree. From memory the the adaptor case was a snug fit on the the output bearing of the g.box. Snug as in I couldn't feel any slop at all but thats going purely by feel. Sounds dodgy, but if it was loose you'd think you'd feel it.

At the time i had my first first kid about 6 weeks old, work very busy and my only car busted so i basically just gave it the an engineer i trust and said fix it.
Everything was centred on that hole.Both faces machined flat etc etc.
Most of the odd 50K km where done with this configuration, so must have been half good.

Been offered a healthy Lt95 at a real good price, so may not be my problem any more. I do like the 5 speed though....decisions....

Originally Posted by Ancient Mariner

In an earlier post my thoughts on fabricating a housing now to machining .The recess for the bearings and circlips machined .010" deeper to allow facing the mounting surface.With this done the mill head is checked for square with a dual digital indicator gauge .A steel plug the size of the bearing is now bolted to the mill table and with a dial gauge in the boring bar the table is positioned and locked.The housing is then bolted over the centralising plug and the TC end bored Then faced .A plug is now made to fit the whatever size you bored on one end and the TC seal size on the other.I now machine two short dowels with a .125" hole thru the middle to fit the TC . With the dowels fitted I then drill thru the TC.The TC is then fitted over the adaptor housing plug and clamped in position The mounting holes then drilled and the dowel holes drilled with a .125" drill, the smaller one from inside the TC with a RA drill.The TC then removed and the dowel holes bored to the correct size.The adapter should now be in perfect alignment

AM

Think I might have to get this done, being .16mm out of alignment, not sure if that's enough to do any damage or not, or if that's just a little play in where it bolts on.

Originally Posted by Boof Ed

My adaptor case was welded after it fell apart.
Engineer added two dowels for alinment on the LT230 end:
1 factory LT230 hollow dowel,
2nd one t remember if factory, but about 10mm solid.

This was done using a gutted LT230 with both input gear bearings as centre point.

He also checked the shaft and Isuzu output flange for true (bolted together) which they were.

So, for mine, any misalignment would be from the adaptor case as bolts to g.box.
This is aligned to the g.box rear bearing by the the milled(i think?) recess in the front face of the adaptor case.

Boof, who did this and are you happy with the work? Pulled my adapter off today and it has done the same as yours, i could just weld it back togethor but not sure if it will be 100%

Originally Posted by Vern

Boof, who did this and are you happy with the work? Pulled my adapter off today and it has done the same as yours, i could just weld it back togethor but not sure if it will be 100%

So are you saying the adaptor housing failed which caused the shaft failure?

Not 100% ben, it may have contributed. I did just measure my msa output shaft as well, got .06mm on that, so alignment is all over the place.

Hopefully all sorted soon

Originally Posted by isuzurover

So are you saying the adaptor housing failed which caused the shaft failure?

i would say YES !!!! its a no brainer really. its not even a question