RogerH Posted February 3, 2020 Report Share Posted February 3, 2020 Hi Gavin, your work on the NRV may have left residual pressure in the OD causing it to stay in OD even though the inhibit switch was open. When you remove the GB check the OD casing as quite often this would cause it to burst/crack. Roger Quote Link to post Share on other sites
KiwiTR6 Posted February 3, 2020 Author Report Share Posted February 3, 2020 9 hours ago, RogerH said: Hi Gavin, your work on the NRV may have left residual pressure in the OD causing it to stay in OD even though the inhibit switch was open. When you remove the GB check the OD casing as quite often this would cause it to burst/crack. Roger Hi Roger. I had been running through the gears on the hoist to see if there was any indication that the OD was now working, which it was, and I'm sure it disengaged (with a thud) prior to shutting the motor down and lowering the car to the floor. It certainly does sound like its the one way bearing that has gone so will do as you suggest when dismantling. This may be a while off yet as I'd hoped to have the OD sorted so that I could use the car over the remainder of the summer. Unfortunately that's not going to happen now as I have some construction work to finish on my house prior to the winter and I can't put it off any longer. The best plans eh? Quote Link to post Share on other sites
Mike C Posted February 3, 2020 Report Share Posted February 3, 2020 4 hours ago, KiwiTR6 said: Hi Roger. I had been running through the gears on the hoist to see if there was any indication that the OD was now working, which it was, and I'm sure it disengaged (with a thud) prior to shutting the motor down and lowering the car to the floor. It certainly does sound like its the one way bearing that has gone so will do as you suggest when dismantling. This may be a while off yet as I'd hoped to have the OD sorted so that I could use the car over the remainder of the summer. Unfortunately that's not going to happen now as I have some construction work to finish on my house prior to the winter and I can't put it off any longer. The best plans eh? Sorry to hear this with summer coming to an end. I often wonder why Triumph used overdrives rather than a 5 or 6 speed gearbox. Surely 2 extra gears would have been cheaper to add than the complex electrical/hydraulic/mechanical overdrives. Anyway the use of overdrives on vehicles has now been decided by history- not that that's of any use to TR6 owners. Quote Link to post Share on other sites
KiwiTR6 Posted February 3, 2020 Author Report Share Posted February 3, 2020 3 minutes ago, Mike C said: Sorry to hear this with summer coming to an end. I often wonder why Triumph used overdrives rather than a 5 or 6 speed gearbox. Surely 2 extra gears would have been cheaper to add than the complex electrical/hydraulic/mechanical overdrives. Anyway the use of overdrives on vehicles has now been decided by history- not that that's of any use to TR6 owners. Mike, I must say a 5-speed conversion is looking pretty attractive right now.... Quote Link to post Share on other sites
Mike C Posted February 4, 2020 Report Share Posted February 4, 2020 26 minutes ago, KiwiTR6 said: Mike, I must say a 5-speed conversion is looking pretty attractive right now.... The thought's occurred to me too. I'd keep the the old Triumph gearbox with OD to sell with the car - in a decade or two. . Quote Link to post Share on other sites
KiwiTR6 Posted February 5, 2020 Author Report Share Posted February 5, 2020 I spoke with the repairer today and explained what had happened. He said that he hadn't come across a complete failure of drive before and that it wouldn't happen with loss of the sprag clutch as this would only affect reverse. He suggested there may be an issue with the new o-rings on the solenoid causing it to stick so I'll take a look at that before I pull the box out. Fingers crossed ! Quote Link to post Share on other sites
KiwiTR6 Posted February 5, 2020 Author Report Share Posted February 5, 2020 Broken main shaft perhaps? Quote Link to post Share on other sites
KiwiTR6 Posted February 6, 2020 Author Report Share Posted February 6, 2020 Mystery solved Any comments as to how old this failure may be? I'm wondering if this could have been the cause of the harsh shifting or the outcome? Quote Link to post Share on other sites
John McCormack Posted February 6, 2020 Report Share Posted February 6, 2020 On 2/5/2020 at 12:20 PM, KiwiTR6 said: I spoke with the repairer today and explained what had happened. He said that he hadn't come across a complete failure of drive before and that it wouldn't happen with loss of the sprag clutch as this would only affect reverse. He suggested there may be an issue with the new o-rings on the solenoid causing it to stick so I'll take a look at that before I pull the box out. Fingers crossed ! Simple checks first. Borrow a good solenoid and test it. My J type OD failed with all sorts of symptoms. It was the solenoid. Quote Link to post Share on other sites
KiwiTR6 Posted February 6, 2020 Author Report Share Posted February 6, 2020 (edited) 11 minutes ago, John McCormack said: Simple checks first. Borrow a good solenoid and test it. My J type OD failed with all sorts of symptoms. It was the solenoid. Not the solenoid unfortunately John (see above). Edited February 6, 2020 by KiwiTR6 fixed emoticons Quote Link to post Share on other sites
John L Posted February 6, 2020 Report Share Posted February 6, 2020 While you have good access to the bottom plate I would check the 'control orifice', picture attached. Courtesy of Buckeye Technical pages. John J type overdrive.docx Quote Link to post Share on other sites
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