Rattly noise that started today

[Mad Mart]

The layshaft (128105) is fixed in position in the casing, it does not rotate. Part no. UKC0662 rotates around the shaft on needle roller bearings.

[xvivalve]

The one in my TR6 had started to move/rotate; they were surprised it still drove when they took it apart!

[Carledo]

As Mart and I both said, the layshaft is SUPPOSED to be fixed in the casing and not rotate, therefore does not NEED a bearing in the case. A plate holds it still in the TR/Sprint/T2000 box, on the OHV/1850/GT6/etc box, in both single and 3 rail variants, it's kept still by a long roll pin that extends through and beyond the shaft and wedges between lugs in the case. It can move, being only a light push fit on assembly, but can rotate no more than about 10 degrees max.

Alun's TR6 box failure is an anomoly, I too am surprised it survived in use like that. But the metal to metal wear from the shaft spinning in the case when it wasn't meant to would have opened up the holes in the case, rendering it scrap. Never seen it happen myself to either sort of box, so probably not a high incidence failure.

Steve

[davidmorr]

There is a Dolomite gearbox on gumtree for $40.

https://www.gumtree.com.au/s-ad/miners- ... 1293480824

Unfortunately, it is the earlier kind. Not sure if it would work.

I would have to find a gear lever too.

But thanks for the pointer.

[davidmorr]

I can't watch your dropbox videos cos I don't have an account. But from the written description of the sound effects and their variations i'm willing to make a guess, which is that you have chipped a tooth on the laygear cluster probably the gear that is driven by the input shaft, at the very front.

You do not need a Dropbox account. Just close the account box and click on Play button.

[/quote]There is another common fault on this (Herald derived) gearbox which is failure of the mainshaft circlip This innocuous clip, all 10p worth of it, holds the 3rd/4th synchro hub and 3rd gear onto the mainshaft and can cause all manner of noises, rattles and difficult gear selection when it fails. But that's the clue to why I don't think it's this fault this time, you haven't recorded any difficulty getting the gears. In the worst case this circlip failure can result in the car getting irretrievably stuck in 1 gear (usually 1st or 2nd) but ALWAYS makes selection harder at least.[/quote]
Generally no troubles getting it into gear, although it crunches a bit into second going up or down.

[RJF_70]

https://www.facebook.com/marketplace/it ... 060317549/ these listed on market place, Wolverhampton way.

[davidmorr]

The engine mounts are near the front of the engine. If the gearbox and bell housing are removed, does the back of the engine need to be supported while the gearbox is being repaired? Or does it rest on the subframe ok?

Repairers who will take the gearbox out for me do not want the car sitting there for weeks occupying a work space, and have suggested I take it home again on a truck and get it taken back when the repaired gearbox arrives to be refitted. I am just wondering if it would be safe to transport with the back of the engine not attached to anything?