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I have an issue with 2nd gear, changing from 1st to 2nd produces a lovely grating sound every time, it is no better when the car is hot, gearbox oil was changed about 3 months ago when I fitted a new Laycock clutch. It was also grating before the new clutch and the old clutch still had lots of life in it, it was just really heavy to use. However changing down from 3rd to 2nd never seems to produce the grating noises. I assume it maybe a synchro issue unless someone has any better ideas. I have heard that replacement rings are hard to come by, 

It is a CR model with Overdrive.

Any suggestions for the best route forward (other than changing directing from 1st - 3rd every time would be welcomed and is the work easy enough to do at home??

TIA

kc

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23 minutes ago, kcsun said:

I have an issue with 2nd gear, changing from 1st to 2nd produces a lovely grating sound every time, it is no better when the car is hot, gearbox oil was changed about 3 months ago when I fitted a new Laycock clutch. It was also grating before the new clutch and the old clutch still had lots of life in it, it was just really heavy to use. However changing down from 3rd to 2nd never seems to produce the grating noises. I assume it maybe a synchro issue unless someone has any better ideas. I have heard that replacement rings are hard to come by, 

It is a CR model with Overdrive.

Any suggestions for the best route forward (other than changing directing from 1st - 3rd every time would be welcomed and is the work easy enough to do at home??

TIA

kc

I had second gear issues groinching up and down

Tom and pete cox sorted it for me 

https://petecoxsportscars.co.uk

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23 minutes ago, kcsun said:

I have an issue with 2nd gear, changing from 1st to 2nd produces a lovely grating sound every time, it is no better when the car is hot, gearbox oil was changed about 3 months ago when I fitted a new Laycock clutch. It was also grating before the new clutch and the old clutch still had lots of life in it, it was just really heavy to use. However changing down from 3rd to 2nd never seems to produce the grating noises. I assume it maybe a synchro issue unless someone has any better ideas. I have heard that replacement rings are hard to come by, 

It is a CR model with Overdrive.

Any suggestions for the best route forward (other than changing directing from 1st - 3rd every time would be welcomed and is the work easy enough to do at home??

TIA

kc

I would first suspect that the clutch plate is not freeing off enough and the problem lies in the operation of the clutch lever on the side of the gearbox where there is not enough movement. Is your car is fitted with the smaller bore master cylinder that can be a problem and wear in the linkage i.e.  clevis pin holes wearing oval like in the clutch pedal and other areas. I had to bush my clutch pedal clevis pin hole with marine bronze to bring it back to size.

Bruce.

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I had a similar issue when a clutch was changed and the garage refilled the gearbox with GL5 oil, its high level of EP  additives make it  too slippery for the TR6 synchros.

Two changes of the G/B oil with GL4 fixed the problem.

 

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5 hours ago, boxofbits said:

Most likely a worn 1st > 2nd synchro ring, but does the clutch disengage properly when selecting 1st or reverse? You’d need to change the rings as a set.

Kevin

No problem with selecting 1st or reverse

kc

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1 hour ago, kcsun said:

No problem with selecting 1st or reverse

kc

Synchro and/or the top hat bush on 2 nd speed main shaft gear probably need looking at then.

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This was mine after I had to continue to race after hearing/feeling the groinching noise in 2nd

Best to address the issue early !!

099EC842-6A5A-464F-B174-7886B7CEDE8D.jpeg

4F7651DD-BF68-4AC3-A86E-E80E75389158.jpeg

B86BAEB1-78AE-4B3B-91BC-6E22908B6E45.png

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Robin, Hamish, are these parts readily available, is it possible to DIY or better to leave it to experts?

I suppose using a gearbox specialist would find any other issues at the same time

I know its "how long is a piece of string" question but what would the going rate be for a specialist overhaul?

kc

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1 hour ago, kcsun said:

Robin, Hamish, are these parts readily available, is it possible to DIY or better to leave it to experts?

I suppose using a gearbox specialist would find any other issues at the same time

I know its "how long is a piece of string" question but what would the going rate be for a specialist overhaul?

kc

I have been driving and fixing TRs for 45 years, but had never done a gearbox.

About 4 years ago I bought a 2500 with J type OD box on ebay with the intention of learning about gearboxes. I pulled it apart 3 years ago, big mistake as I wasn't ready to do any work on it. I did use the synchros which were in very good condition on one of my TR2s. My reason for not getting to it was I was afraid I wouldn't be able to do it.

A few months ago I decided to get into it. It had had a layshaft failure so I rounded up all the gears and bushes I would need. I bought a repair kit of bearings, seals, new upgraded layshaft etc.

I put it all together myself with a great deal of help from the Buckeye Triumph guides (download and print them from Google) but needed help to get the mainshaft onto the centre bearing. The Register member who helped with this task has done many many gearboxes and was able to guide me through the final setup and test.

The point of my story is that it wasn't that hard and with a little help from the numerous online guides and other more knowledgeable members it shouldn't take too long to do. I was fortunate that it is a spare gearbox so I wasn't in a hurry to get a car back on the road.

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i have done lots of spannering  on all sorts of classic and vintage cars but i an no engineer and i measure tolerances by eye and feel eg suspension etc  but i haven't done a box  and was introduced to pete cox when i had issues and he has done all my gearbox/overdrive/rear axle work since.

obviously you pay a little more but the gearbox can be a pain to get in and out and i would hate to fit one only to find it wasn't right and have to start all over again.

pete and his  son tom have all the bits and are honest and would tell you straight if extras were  needed or not.

see my post near the top for the web link.

there are other companies that have a good reputation but i haven't had need to use them

only you know your competency levels and tool store        

H

 

Edited by Hamish
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