Laygear Circlips

[Squidger]

Just rebuilding a 1098 ribbed gearbox and I'm in the process of renewing the layshaft needle bearings (layshaft and laygear in good nick). The new bearings from ESM seem a touch long and extend well over the gap left for a circlip at each end. Has anybody else experienced this? I'd rather make sure the circlips are fitted to retain the bearings as BMC intended.

[martin418]

have you measured the new bearings against the old ? it's not uncommon to find modern bearings are metric equivalents and are slightly different ,does the new bearing sit against a shoulder if so is it fully home , it's possible the new bearing has not got enough radius on it to allow it fully home , i recently had the same problem on an old garden tractor , simply bearings on line have a very good range of all types of bearings listed with imperial and metric sizes shown so it's possible to see the slight differences , it's also possible the old bearings have a part no on them which should relate to a modern equivalent

[Squidger]

The bearings are fully pushed home against the inner circlips so no problems there. The old bearings were replacements too, and of the same size as the new bearings. The last owner of the box must have fitted new ones without circlips, but I have no idea how many miles the box has done since then. The thrust washers obviously kept the bearings in place but it doesn't seem an ideal situation as the circlips are designed to be there for a reason.

Does anyone have any BMC/Leyland layshaft bearings which they could measure (length-wise) for me please?

[bmcecosse]

As long as the inner clips are in place - to hold the bearings at each end - I wouldn't worry too much. I have heard of the whole laygear being filled with bearings (in Mini applications) where a LOT of power is being transmitted.

[philthehill]

There are no outer circlips fitted to the lay-shaft of a Minor 1098cc gearbox.
All you have is the two inner circlips Pt No: 22G278, the distance piece Pt No: 22G277, the two roller bearings Pt No: 88G396.
The roller bearings are retained in their working position by front thrust washer Pt No: 2A3023 (early) or 22AS1836 (late) and rear thrust washer Pt No: 2A3024 - 2A3027 dependent upon clearance requirements.
So long as the roller bearings do not protrude past the end faces of the lay gear all will be well.
Whoever assembled it previously does not matter as they assembled it correctly.

[Squidger]

There are no outer circlips fitted to the lay-shaft of a Minor 1098cc gearbox.
All you have is the two inner circlips Pt No: 22G278, the distance piece Pt No: 22G277, the two roller bearings Pt No: 88G396.
The roller bearings are retained in their working position by front thrust washer Pt No: 2A3023 (early) or 22AS1836 (late) and rear thrust washer Pt No: 2A3024 - 2A3027 dependent upon clearance requirements.
So long as the roller bearings do not protrude past the end faces of the lay gear all will be well.
Whoever assembled it previously does not matter as they assembled it correctly.

That's good to know thanks, but strange how the laygear still contains grooves at either end (presumably for circlips) The 1098 parts diagrams also seem to show a circlip on the outside of the bearing unless this was meant as a replacement for the inner circlip, as part of the bearing kit?

I guess the bearings don't go anywhere because of the thrust washers so the clips wouldn't do a great deal. I just wanted to make 100% sure before pressing on so thanks again all

[philthehill]

Parts lists can be confusing as they tend to be generalised unless you know and they specify the car number, the chassis number and the gearbox number and the specific application.
Do not get confused by reading the BMC wksp manual section FF Series 2 gearbox parts illustration FF6 (Part No 101) because there is an inner and outer circlip holding the roller bearings in place. The outer circlip being displaced for later cars and attached is a illustration relating to the breakdown of parts fitted to the 1098cc gearbox lay-shaft.[frame][/frame]
There appear to have been two lay-shafts fitted to the 1098cc gearbox Pt No: 10G150A (early 1098cc) and Pt No: 22G1100 (late 1098cc and 1275cc). Yours may be an early lay shaft that had the circlip groves but which are now redundant.
To reiterate:- so long as the roller bearings do not protrude beyond the end faces of the lay-shaft all will be well.

[Squidger]

Brilliant, thanks very much Phil

[cab43]

There are no outer circlips fitted to the lay-shaft of a Minor 1098cc gearbox.
All you have is the two inner circlips Pt No: 22G278, the distance piece Pt No: 22G277, the two roller bearings Pt No: 88G396.
The roller bearings are retained in their working position by front thrust washer Pt No: 2A3023 (early) or 22AS1836 (late) and rear thrust washer Pt No: 2A3024 - 2A3027 dependent upon clearance requirements.
So long as the roller bearings do not protrude past the end faces of the lay gear all will be well.
Whoever assembled it previously does not matter as they assembled it correctly.

Just thought I'd have a look on here to see how you remove the outer circlips that are on my layshaft.
any ideas?

Thanks.

Paul.

[philthehill]

Hold the lay shaft vertically in a vice using soft vice grips and use a small bladed screw driver to get behind the circlip and flick out the circlip whilst making sure you know where it ends up. If you damage the circlip it does not matter as you will not be using the outer ones anyway.

[cab43]

Perfect,


Thanks.