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rvwp

Gearbox wow's

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Hi Guys,

Finally put my TR4a engine back together. Now to the gearbox. Feels a bit roughish when turning. No oil in it! Probably been sitting since 1984. So strip down needed.

No problem, been there before with my TR6, but!

First problem. The tapered pin on the clutch operating rod came out too easily and has fractured, By the look of the rusty fracture it had been so for many years. So, how to remove the broken part to get the shaft out.

As I recall this a common problem. It can't be drilled out? Easiest way would be to cut the shaft either side and replace it once the broken part of the pin is removed from the fork (hopefully).

But where to get  a new shaft. Moss don't seem to list it. Is there a Forum gearbox wizard that sells such thing second hand?

Help

Rich

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My new shaft (TR6) came from Moss. Good fit, and around 20 pound.

Waldi

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Hi Rich ~

When I had the same problem with the tapered pin on my 3A I cut the cross-shaft and replaced it with a new one.

I replaced the inferior tapered pin (a design disaster in my opinion) and cross drilled the bearing carrier and cross shaft

and fitted a nut and bolt to further secure the assembly.

Tom.

CLUTCH - Copy.jpg

Edited by Fireman049

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To remove the broken off part, drill a small hole up from the "fork" side in line with the pin, then drift it out.

Bob.

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If Moss don't list it any more, it is the same box as a Triumph 2000 or 2500 Saloon. Chris Witor is specialist supplier of parts for those cars, he lists the clutch cross shaft as being available for £20.  He also used to offer an uprated pin.

Chris Witor website

Rgds Ian

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Ah! I'm being dipsy again:D. I was looking under gearbox not clutch. I will try the drilling a hole to punch the broken part out, or maybe just buy a replacement  and cut the old shaft each side of the fork as it's rusty and pitted:mellow: Anyway, time forget about TR's,  we are off to sunny Greece tomorrow for a couple of weeks to stay with our daughter, forecast  sun, 15/16 degrees, no rain and gales :D. Happy Xmas to all and a happy new year.

Thanks

Rich

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I've done several of these Rich and have used the 'drill a hole in the clutch fork'  method however I still ended up replacing the shaft due to the wear under the bushes so the last couple I just cut out straight away and found the same typical wear which would warrant a new shaft anyway - so (assuming your chosen supplier can deliver a decent one) to my mind - for the cost it's just not worth messing with.

 

clutch fork.jpg

Edited by Chilliman

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You can save a worn shaft by fitting double bearings but obviously don’t enjoy the benefits of the extra support that the double width bearing would otherwise afford. 

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Yes I reckon cutting out and replacing is probably best as the shaft is rusty, the gearbox having been off the car for probably at least 35 years.  Chris Witter does them for £27 with new uprated pin. I believe he has a good reputation for quality?

When considering the cost of restoring this Tr4a, £20 is peanuts:) 

Regards

Rich

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Rich,

The parts I ordered from Wittor were ok (good).

I would cut the old shaft, replace with a new item and new double bearing bushes and fit a roll pin, as recommended on this forum. That’s what I have done.

Waldi

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2 hours ago, rvwp said:

Yes I reckon cutting out and replacing is probably best as the shaft is rusty, the gearbox having been off the car for probably at least 35 years.  Chris Witter does them for £27 with new uprated pin. I believe he has a good reputation for quality?

When considering the cost of restoring this Tr4a, £20 is peanuts:) 

Regards

Rich

Rich - I know you like doing your own thing, but if you decide you would like a lovely rebuilt unit to treat yourself to a deserved christmas present, you know where to come!  You would get a free cross shaft and an extra pinned bolt to go with it!!!

I take it yours is an A type OD unit?

Have sent you a PM with more details

Cheers   Rich

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Hi Guys, 

Nearing the completion of my gearbox rebuild. Fitted a new clutch cross shaft with an additional roll pin for extra security.

The gearbox is in a 4a and the cross shaft is a non greaseable type and does not use the locating bolt, but is floating with a anti rattle spring.

However as the original bushes were worn, I replaced these. Whether I ordered the wrong bushes or not I noticed that they were grooved  so that a locating bolt if used would pass through.

As some way of greasing would probably be good,  I came up with the idea of using  the locating bolt holes that are in the gearbox casting by blanking off the 5/16 UNC threaded side of the hole with a 5/16 UNC grub screw. The 5/16 plain hole side was tapped 3/8 UNC, (5/16 is the correct tapping size). A Grease nipple with a 3/8 UNC thread was screwed into this side. This was done on both sides. Grease can now be applied whenever. Both the grub screw and grease nipples were available on e-bay for around a £5, more than needed though.

A quick simple mod that hopefully will stop bush wear for later used non greaseable cross shafts. 

Regards

Rich

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