Thread: Gearbox help please

Hard to diagnose from those symptoms but it could be any of the following
1............................3/4 synchro unit
2............................mainshaft front needle roller bearing failure possibly with journal surface erosion.
3............................input shaft bearing retaining tabs.
My guess would be the mainshaft front needle roller - afraid it's a box out job to find out/fix

Thanks Brian, not what I wanted to hear. Is there any more to be seen through the top cover before removing the box?

Can it be driven while I sort something out (avoiding 3rd) or am I risking more damage?

Probably not but you could take the top off and have a look - never know you might find something.

Originally Posted by rathgar

Can it be driven while I sort something out (avoiding 3rd) or am I risking more damage?

Depends what it is as to whether you do more damage.

Originally Posted by Bearman

Hard to diagnose from those symptoms but it could be any of the following
1............................3/4 synchro unit
2............................mainshaft front needle roller bearing failure possibly with journal surface erosion.
3............................input shaft bearing retaining tabs.
My guess would be the mainshaft front needle roller - afraid it's a box out job to find out/fix

Haven't had a chance to look much more at this but did a bit more testing today and the noise is not just in third but in all gears and I can know get it to do it stationary (with transfer case in neutral).

I'm thinking it might be clutch related. Release bearing? spigot bearing? when its making the noise and you depress the clutch it feels "different" to normal.

Either way looks like the box is coming out.

Thrust bearing?
If so let it squeak. No biggy.
Replace when you can.

Finally got a chance to have a look at the 110.

I am now sure that the noise is coming from clutch release mechanism but not the bearing. The Sleeve extension (Part # R571738) has been rubbing on the front cover (Part # R576340), there are visible rubbing marks, this has been caused by the release arm pivot point coming apart allowing excess movement, hence the loose feel in the clutch when the noise was evident. The sleeve extension has previously been tack welded to the front cover these welds have broken. Is this a known cure to prevent movement of the extension or some army mechanics bodge? Should the extension be free to move?

Are there any improvements to had to the retaining system for the release arm pivot point. Doesn't seem like the best system of retaining to me. Not to mention the plastic "staple"to retain the release bearing to the arm.

Thanks

Ian