kcsun Posted January 15, 2022 Report Share Posted January 15, 2022 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 Quote Link to post Share on other sites
Hamish Posted January 15, 2022 Report Share Posted January 15, 2022 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 Quote Link to post Share on other sites
astontr6 Posted January 15, 2022 Report Share Posted January 15, 2022 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. Quote Link to post Share on other sites
Mike C Posted January 15, 2022 Report Share Posted January 15, 2022 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. Quote Link to post Share on other sites
boxofbits Posted January 15, 2022 Report Share Posted January 15, 2022 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 Quote Link to post Share on other sites
trchris Posted January 15, 2022 Report Share Posted January 15, 2022 Hi I agree with Kevin. If it were the clutch it would affect all gears not just second its looks like gearbox rebuild time Chris Quote Link to post Share on other sites
kcsun Posted January 15, 2022 Author Report Share Posted January 15, 2022 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 Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 15, 2022 Report Share Posted January 15, 2022 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. Quote Link to post Share on other sites
dingle Posted January 15, 2022 Report Share Posted January 15, 2022 My guess is that the "top hat"bushing on 2nd gear has broken and results in difficult shifting as well as a grating noise. But only an autopsy will identify the culprit. Berry Quote Link to post Share on other sites
Robin Powell Posted January 15, 2022 Report Share Posted January 15, 2022 This what happenned to my 2nd gear top hat bush when I had a similar problem. Quote Link to post Share on other sites
Hamish Posted January 16, 2022 Report Share Posted January 16, 2022 This was mine after I had to continue to race after hearing/feeling the groinching noise in 2nd Best to address the issue early !! Quote Link to post Share on other sites
kcsun Posted January 16, 2022 Author Report Share Posted January 16, 2022 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 Quote Link to post Share on other sites
John McCormack Posted January 17, 2022 Report Share Posted January 17, 2022 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. Quote Link to post Share on other sites
Hamish Posted January 17, 2022 Report Share Posted January 17, 2022 (edited) 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 January 17, 2022 by Hamish Quote Link to post Share on other sites
Chris Hubball Posted January 17, 2022 Report Share Posted January 17, 2022 + 1 For Pete Cox Cheers Chris Quote Link to post Share on other sites
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