Gears and bushings replacement

I bought a trans, less the main box, on here.
The bushing need to be replaced. Is that something that require a Norton shop to do or can any machinist do it or maybe me?

Guido said:

I bought a trans, less the main box, on here.
The bushing need to be replaced. Is that something that require a Norton shop to do or can any machinist do it or maybe me?

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You should be able to replace them all yourself. I suggest you buy a copy of the NOC gearbox servicing DVD by Mick Hemmings.

The genuine AN bushes/bushings are supposed to be supplied pre-sized and shouldn't require any reaming.

I've ordered like 3.5 tranny bush kits over time from UK and USA vendors and have yet to find any bushes but the sleeve shaft ones that didn't need hand or machinist reaming. Save one of the old sleeve bushes to space the two new ones to stay separated and supporting sleeve shaft from its wiggle worming on Cdo Torque loads. Here's prior thread to entertain or depress as case may be for me. I highly recommend the sleeve bushes be spiral oil grooved as zero oil can get into them in lower gears turning and all the oil in them get flung out when lower gear turning. You should feel guilty knowing you are using up tranny bushes before their time by spending any time in lower gears. Get one or 2 extra first gear bushes as finger nail thin and carry hi loads often, kick to stop lights turning green. Don't need any gaskets at all as no spacing function and w/o em the lay shaft shiming is not needed and gives a bit more rigid nip up. I use Hylomar for sealing Everything now of course.


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It's quite simple to do yourself. Old Britts has an excellent tech how-to on their site. I re did all the bushings in my tranny in '10 using those instructions with no drama involved at all. Be careful with the shifter positioning. If you get it wrong you get to partially disassmble again but it is clearly covered in the OB tech article.

Once you have gotten into the gearbox and see first hand how it all functions, you will see how simple they are and all fears will disperse. You will be able to go in and out of that thing in term of minutes and not hours.

I think the gearbox is the simplest of the major components. It is nice to have it on the bench but not needed. I have yet to see a more universal unit than the AMC gearbox. Oh, I better not forget to say, IMHO.

I got all my gearbox stuff from Hemmings, and I found the mainshaft bushings tight and had to deal with that. I did it by hand. The rest of the bushings were fine. I probably should have sent the press on bushings to someone that knew what they are doing, but it seems fine now it's together. I should have put 3 bushings on the mainshaft and grooved them too, but I only put on 2.

Dave
69S

The genuine AN bushes/bushings are supposed to be supplied pre-sized and shouldn't require any reaming.

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All except the 1st laygear bush. This is the really thinwall item that needs very careful installation and sizing. Both ones I have done came in AN packaging and are well undersize for the shaft.

Keith1069 said:

The genuine AN bushes/bushings are supposed to be supplied pre-sized and shouldn't require any reaming.

Click to expand...

All except the 1st laygear bush. This is the really thinwall item that needs very careful installation and sizing. Both ones I have done came in AN packaging and are well undersize for the shaft.

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The AN 1st gear bush I fitted did not require reaming.

I must have been done then. The first bought from and was reamed by Emery at a cost of £5 and he made such a piss poor job of it the clearance was worse than the old one I was trying to improve on. The replacement from AN directly also needed reaming. I had that done locally.

I found 1st gear layshaft bush the most critical wear component. I turned a bush up myself, very thin wall, but it worked fine.

Cheers Richard