Thread: c.h.i.e.f 's 110 Isuzu county

I suspect the 6BG flywheel and housing is the same as the 4BG/4BD industrial SAE flywheels.
The thickness of the housing seems about right. One of the lads on 4BTswaps.com has a 4BG industrial engine.

Originally Posted by Dougal

I suspect the 6BG flywheel and housing is the same as the 4BG/4BD industrial SAE flywheels.
The thickness of the housing seems about right. One of the lads on 4BTswaps.com has a 4BG industrial engine.

This may be the answer then

Some pics from the MXA manual.

MXA-5


MXA-6


Part of exploded assy showing differences in rear extension between -5 & -6


Ratios


It seems the MXA-5 gearbox was used with a 4BD1T in NPR59 from 4th Month 1990 on. So these would have a suitable bellhousing for a MXA-6 mine came from behind a different Isuzu engine and I had to modify a bellhousing from a MSA-5.

The input shaft is 21 spline, 29mm dia. I used an Exedy clutch disc ISD134
The complete Exedy clutch kit is ISK6533, and throwout bearing is 2226. That is the Isuzu 300mm clutch and the landie flywhell would need to be modified.

I used the stock pilot bearing (deep groove ball bearing).

From memory, when I measured my stuff, there was no practical room to extend the clutch face of the flywheel out (the throwout bearing could not retract much further), unless the bellhousing was spaced further back from the flywheel housing.

Wow answered almost everything possible in one nice post !!! Thanks John

Ok so with the mxa-6r standard diffs and standard transfer 35" tyres in 5th and then 6th gear could someone help me figure out rpm at 100km/h please?? as I have never figured it out before

Originally Posted by c.h.i.e.f

Originally Posted by Bush65

Better shaft to modify is the spud shaft from a disco ZF auto (use the one with longer spline.

Then only need to fit a flange. Shrink fit the flange onto the end of the spud shaft and circumferential weld at the front end only (for weld prep make a chamfer at the end of the shaft and end of the bore in the flange. Weld at that position will not cause any problems as long as the parts have suitable pre-heat before welding and low hydrogen electrodes are used (or good wire).

Thanks I will take that into consideration.. As this may be an option for this project if not Grubbs shaft or the one dougal just posted will be high on the list...

This pic shows the spud shaft for a ZF

Shrink the flange onto the RH end. It fits into the LT230 and the seal runs on the LH end of the large diameter.

If you check how much protrudes from the front of the LT230, you might even be able to shorten the length a little. It is nice but not essential to make the length of the boss in the flange so overall thickness is approx same as diameter of the shaft.

Nothing wrong with the shaft that grubb supplies, just that I seem to remember he chose a length that suited the stock position of the LT230 and the MSA-5 gearbox. As your gearbox is longer, the above might be made shorter, but if the LT230 has to go back anyway, perhaps a little more with with grubbs shaft is more convenient. I don't have enough info to know what the relative lengths would be.

I can't remember how far back an LT230 has to go so that it can couple to an MXA-6 gearbox.

I tried to make the gearbox and transfer case as short as practical, couldn't do that with an LT230, so modified an LT95 transfer case and adapted it, but wasn't completely happy. If I had a 110 chassis at the time, something like grubbs kit would have been cheaper and easier than what I have done now.

I doubt grubbs adapter housing will bolt to the rear of the MXA-6 - it may bolt to a MXA-5, but the 6 has a intermediate plate between the back of the gearcase and the extension housing (see item 21 in the 3rd pic of my previous post) and the bolt pattern is much different).

Originally Posted by c.h.i.e.f

Ok so with the mxa-6r standard diffs and standard transfer 35" tyres in 5th and then 6th gear could someone help me figure out rpm at 100km/h please?? as I have never figured it out before

This online calculator from Ashcrofts will do what you want

Gear ratios for the MXA are in my post above. This list doesn't have the -6R, so use the ratios for the 5R and 6th as given (only need to change ratio for 3rd from what is given for the MXA6S.

Once again John thanks heaps !!! This info is priceless....well I have got to call grubb to discuss further and if his shaft fits to the mxa6 I will run with that as for adaptor you are correct it does not fit but I'll have to make do ... Advantage of the shaft dougal posted is transfer can be mounted in a different position I don't know what your thoughts are on that shaft ? Rakeway have not got back to me yet so cannot disclose any more info other than Dougal's previous posts