mainshaft bushings

I found pieces of the mainshaft bushing in the bottom of the gearbox. It seems that about a 1/4" moved inward and got chipped off. The inboard bushing is tight inside the gear, the outboard bushing slides back and forth. The book calls for two bushings and it appears to have 3 bushings. This gearbox has never been opened and has been working great. I went to change the oil and discovered the bits in the bottom. Since this is a 1974 MK2A and still had the Portuguese layshaft bearing, I ordered a new one and received a ball bearing instead of the usual roller replacement...is this what is being used now?

If the ball bearing has a resin cage it's ok, if steel or brass then get a roller or the resin caged ball.

The bushes moving is a common issue, the fix was to fit 3, so stick with 3 new ones. Some Loctite on the od sounds like a good idea in your case.

I answered my own question......I was sent a wheel bearing instead of the correct roller ....price difference of about $35. Thanks for the info on the mainshaft bushings. I would like to see a way for oil to reach the entire bearing such as scrolling but it is too thin and sintered bronze. Has anyone else had the problem of the bushings moving inward and chipping off?

Does it not have internal circlips at both ends?

seattle##gs said:

I was sent a wheel bearing instead of the correct roller

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The original layshaft ball bearing was the same part (040100) which is the layshaft part number listed in parts books.
067710 should be quoted when ordering the layshaft roller bearing.

EstuaryBoy said:

Does it not have internal circlips at both ends?

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The Mk2/2A 064991 sleeve gear would normally have had a single circlip at the outer end.

The Mk3 sleeve gear 065954 has a circlip at each end (replaces previous sleeve gears).
https://andover-norton.co.uk/en/sho...hes-and-circlips-23t-04-0422-06-1057-06-4991-