david johnson Posted September 7, 2008 Report Share Posted September 7, 2008 Ive been out today, the best day for ages. Noted again a tendancy to refuse to enter 2nd gear on the downchange first time, second time it slips in. On upchanges there is never a problem, and gear box generally very nice. Im going to put in a more powerful engine this winter, so if there is a problem it can be solved.Can anybody advise, Thanks David Johnson. Quote Link to post Share on other sites
marko Posted September 7, 2008 Report Share Posted September 7, 2008 It sounds like your second gear synchromesh is worn - gearbox out I would guess..... Quote Link to post Share on other sites
marvmul Posted September 7, 2008 Report Share Posted September 7, 2008 When the gearbox cover is lifted off, the clearance between the 2nd synchromesh ring and 2nd gear can be mesured with feeler gauges. I believe it should be more than 1 mm. In a new box, the clearances of the 4 rings are about the same. Also general wear of the synchro hub can be at fault, or the box can contain parts of gearboxes with slightly different specifications. Or the brass bush of the second gear can be on it's way home : later TR6's have steel bushes that can be retrofitted. But maybe the 2nd bush would cause other symptoms? If the difficulty with the second gear was there since the box was rebuild, most likely a bad quality aftermarket 2nd synchroring was used. Quote Link to post Share on other sites
rpurchon Posted September 7, 2008 Report Share Posted September 7, 2008 (edited) Ive been out today, the best day for ages. Noted again a tendancy to refuse to enter 2nd gear on the downchange first time, second time it slips in. On upchanges there is never a problem, and gear box generally very nice. Im going to put in a more powerful engine this winter, so if there is a problem it can be solved.Can anybody advise, Thanks David Johnson. i had same problem with my rebuilt gbox. hard to get into 2nd gear for the first few times when cold. i put it down to oil too thick,as it was ok when warm. i have refilled it with comma SX75W-90 High Performance Semi-Synthetic Gear Oil you can tell its a lot thinner just by shaking the can ? solved my problem and yes my overdriveworks spot on. [4000 miles] might be worth a try for £10 richard Edited September 7, 2008 by rpurchon Quote Link to post Share on other sites
D1070 Posted September 8, 2008 Report Share Posted September 8, 2008 David, I had a similar problem when i first bought the 5. As has been mentioned the internals of brass are just not strong enough and therefore the steel solution is the only long term solution. Certainly the gearbox over the past 18 months, since this modification, has been fine, hope you are well, Laurence Quote Link to post Share on other sites
TR6 Poor Posted September 8, 2008 Report Share Posted September 8, 2008 When I rerebuilt my gearbox 2 yrs. ago, there were only 2 good syncro rings on the market, one was NOS, if you could find them. The other was made in Germany, and I THINK that is available thru Revington. Also, due to the difficulty in removing the gear box, I would put a new second gear in, as NOS ones are somewhat inexpensive overhere. You need to go thru the whole gearbox and clutch assembly, unless you enjoy the removal process. Quote Link to post Share on other sites
david johnson Posted September 8, 2008 Author Report Share Posted September 8, 2008 Thanks for the advice. Ill try the oil, but it could be the brass things, that should be steel. David Johnson Quote Link to post Share on other sites
rpurchon Posted September 8, 2008 Report Share Posted September 8, 2008 Thanks for the advice. Ill try the oil, but it could be the brass things, that should be steel. David Johnson if you have a j type box they will be steel. Quote Link to post Share on other sites
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