DavidJGHayes Posted September 14, 2020 Report Share Posted September 14, 2020 Overdrive on TR3a I have recently experienced occasional delays with the o/drive kicking in. Usually it works fine, but sometimes there is a delay. Anything from 5 seconds to 10 minutes! Any advice or suggestions would be appreciated. Regards David Quote Link to post Share on other sites
stuart Posted September 14, 2020 Report Share Posted September 14, 2020 First check your oil level. Stuart. Quote Link to post Share on other sites
John Morrison Posted September 14, 2020 Report Share Posted September 14, 2020 Hello David, and welcome to our forum, easiest thing to check is oil level in the gearbox, first call and then get back to us. David, I have changed the title to something more relevent to your question, it will get you more answers and aid searches for other forum users in the future. John. Quote Link to post Share on other sites
ianc Posted September 14, 2020 Report Share Posted September 14, 2020 (edited) It could be that the contact on top of the solenoid which disconnects the pull-in coil, is failing to re-establish the connection when the solenoid is de-energised. If that happens, the poor, rather weak, hold-in coil will struggle to operate the solenoid, but may eventually succeed given time and a following wind! I wrote an article in the early days of the club, and you'll find it in the Technicalities CD, pages D49 & D50. Ian Cornish Edited September 15, 2020 by ianc CD page references Quote Link to post Share on other sites
DavidJGHayes Posted September 15, 2020 Author Report Share Posted September 15, 2020 Thanks for all the help and advice it is appreciated. Quote Link to post Share on other sites
Tony_C Posted September 15, 2020 Report Share Posted September 15, 2020 Welcome David, Nice looking car (& the best model) and colour scheme; is that ‘Geranium’ ? After years and years of flawless operation, my overdrive played-up end of last year... long story (played out on here) in the end I did it properly with the tunnel out, complete rewire and new solenoid Good luck Tony Quote Link to post Share on other sites
Mick Forey Posted September 15, 2020 Report Share Posted September 15, 2020 Something else to check is the overdrive switch. My overdrive had similar characteristics but I realised if I operated the switch firmly it engaged quicker. Stripped the switch to find corrosion on the contacts clearly causing high resistance, cleaned everything and reassembled it and all was well and still is 3 years later. Mick Quote Link to post Share on other sites
iain Posted September 15, 2020 Report Share Posted September 15, 2020 2 hours ago, Mick Forey said: Something else to check is the overdrive switch. My overdrive had similar characteristics but I realised if I operated the switch firmly it engaged quicker. Stripped the switch to find corrosion on the contacts clearly causing high resistance, cleaned everything and reassembled it and all was well and still is 3 years later. Mick That is a very useful observation. Thanks for sharing Mick Iain Quote Link to post Share on other sites
John McCormack Posted September 16, 2020 Report Share Posted September 16, 2020 Similar problem a few years ago. I removed the switch, tapped all the dust out of it, working fine for the last few years. Quote Link to post Share on other sites
TR4A1965 Posted November 2, 2020 Report Share Posted November 2, 2020 I am late to this topic but.......My overdrive would engage but then would not release. I tried the oil/solenoid/switch first but eventually traced the issue to the pressure valve. It is a gearbox tunnel off operation. This is my valve in the picture. There is a small hole the size of a pin and this was blocked with the smallest piece of crud/grit. If you have a gearbox rebuild I guess it is possible to have the smallest bits of metal floating around? This was potentially my issue. It is a DIY job but it is just a faff and be careful not to drop anything. One part is a ball bearing for instance and if that drops???????? Once unblocked everything worked fine and has done since. (4 years). Best wishes Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.