RogerH Posted February 28, 2017 Report Share Posted February 28, 2017 Hi Folks, it is that time of year (again, again........) On Sunday we went out to meet the Thames Valley group. Had a nice chat to a couple and then shot off to the coast for cockles. Half way to the coast I noticed that Overdrive wasn't doing its thing. Today I removed the tunnel etc to get a good look at things. The electrics and external mechanics are all working fine. Yesterday I put in a small amount of oil - not enough to cause the problem. In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little. I have a feeling something inside has gone awry. The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak. Roger Quote Link to post Share on other sites
Hamish Posted February 28, 2017 Report Share Posted February 28, 2017 What a pain. Gets to that time of year for serious use and they play up ???? Hope it's something cheap and simple. H Quote Link to post Share on other sites
Kevo_6 Posted February 28, 2017 Report Share Posted February 28, 2017 Hi Folks, it is that time of year (again, again........) On Sunday we went out to meet the Thames Valley group. Had a nice chat to a couple and then shot off to the coast for cockles. Half way to the coast I noticed that Overdrive wasn't doing its thing. Today I removed the tunnel etc to get a good look at things. The electrics and external mechanics are all working fine. Yesterday I put in a small amount of oil - not enough to cause the problem. In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little. I have a feeling something inside has gone awry. The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak. Roger Hi Roger What is it with gearboxes. Hope to take mine for a test drive this week after replacing hubs, drive shafts and a re-balanced prop. So i'm hoping my gearbox will be OK after the last episode. I don't hold out much hope. Good luck with yours and hopefully it's nothing major. Quote Link to post Share on other sites
Lebro Posted February 28, 2017 Report Share Posted February 28, 2017 Most of the TVG were at the Onslow arms having their AGM, sorry to have missed you. Bob. Quote Link to post Share on other sites
stuart Posted February 28, 2017 Report Share Posted February 28, 2017 Hi Folks, it is that time of year (again, again........) On Sunday we went out to meet the Thames Valley group. Had a nice chat to a couple and then shot off to the coast for cockles. Half way to the coast I noticed that Overdrive wasn't doing its thing. Today I removed the tunnel etc to get a good look at things. The electrics and external mechanics are all working fine. Yesterday I put in a small amount of oil - not enough to cause the problem. In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little. I have a feeling something inside has gone awry. The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak. Roger Roger do you have a link for the Q seals please? Stuart. Quote Link to post Share on other sites
RogerH Posted February 28, 2017 Author Report Share Posted February 28, 2017 Hi Stuart, I got them from these people http://maydayseals.co.uk/35-quad-rings I can't find the number at the mo but give then a ring - it is 1/2" ID. I'll look in the garage shortly. Roger Quote Link to post Share on other sites
Guest ntc Posted February 28, 2017 Report Share Posted February 28, 2017 Roger Remember 9/10 it is electrical even if you are showing juice. Quote Link to post Share on other sites
RogerH Posted February 28, 2017 Author Report Share Posted February 28, 2017 Hi Neil, the electrics were working fine. This morning I pushed on the little lever but still no OD. I'm sure something has gone adrift inside. We'll see. The box is now at the workshop for investigation/repair. Roger Quote Link to post Share on other sites
LGFromage Posted February 28, 2017 Report Share Posted February 28, 2017 I suggest that the switches on top of the gearbox need cleaning. A check of the electrical resistance will confirm or otherwise. Tim Quote Link to post Share on other sites
stuart Posted February 28, 2017 Report Share Posted February 28, 2017 Hi Stuart, I got them from these people http://maydayseals.co.uk/35-quad-rings I can't find the number at the mo but give then a ring - it is 1/2" ID. I'll look in the garage shortly. Roger If you have the measurements would be helpful, thanks Roger. Stuart. Quote Link to post Share on other sites
Guest ntc Posted February 28, 2017 Report Share Posted February 28, 2017 Hi Neil, the electrics were working fine. This morning I pushed on the little lever but still no OD. I'm sure something has gone adrift inside. We'll see. The box is now at the workshop for investigation/repair. Roger Roger It will be interesting to see what you find as they rarely fail like that. Quote Link to post Share on other sites
RogerH Posted February 28, 2017 Author Report Share Posted February 28, 2017 Hi Tim, the electrics are working correctly. The solenoid pulls in and the jigging arm moves to the correct place. Hi Stuart, the seal is described as Q112 Nitrile Quad Ring. JF410 Quad Ring. The Q = quad Ring 112 = standard designation for 1/2 O ring. 1/2" ID 11/16 OD Roger Quote Link to post Share on other sites
Lebro Posted February 28, 2017 Report Share Posted February 28, 2017 You must be a real expert at removing gearboxes by now (mental note) Bob. Quote Link to post Share on other sites
RogerH Posted February 28, 2017 Author Report Share Posted February 28, 2017 Hi Bob, nothing has time to seize up. Even the exhaust box/pipe came off easily. Roger Quote Link to post Share on other sites
LGFromage Posted February 28, 2017 Report Share Posted February 28, 2017 I still suggest that the continuity across each gearbox switch is checked. In normal operation there should be no resistance when a gear is selected, but switches with dirty contacts sometimes work and sometimes don't depending on the level of resistance present, which varies. If nothing else it is a simple low cost check so worth a try. Tim. Quote Link to post Share on other sites
RogerH Posted February 28, 2017 Author Report Share Posted February 28, 2017 Hi Tim, the electrics really are OK - honest. The switch works every time. The solenoid comes in and stays there every time. The little lever on the right hand side for jigging the 'thing' moves with the solenoid. It can't be the top cover switches as every thing moves when it should. The only problem is that the OD does not engage its gear. Anyway - it's too late now. The box is at the engineering workshop awaiting diagnosis. Roger Quote Link to post Share on other sites
iain Posted February 28, 2017 Report Share Posted February 28, 2017 If the electrics are all working i would guess its the little ball valve not seating properly and therefore then pump not generating pressure. Time to clean it and reseat. Item 30 http://www.revingtontr.com/tr3/triumph-catalogue/aw Don't ask how I know! Iain Quote Link to post Share on other sites
John L Posted February 28, 2017 Report Share Posted February 28, 2017 I have just done the selector shaft seals and they are still not quite big enough for the depth of the recess in my cover, (3.34mm depth) I have added a nylon backup ring to the outside of the seal, they come from the same company as the quadrings, they are part number AE112. Now the retaining plate really holds the seals tight. John Quote Link to post Share on other sites
littlejim Posted February 28, 2017 Report Share Posted February 28, 2017 (edited) Dunno if relevant, but to get my O/D to engage I had to put the car up on jack stands and adjust/tune the lever on the driver's side until I got proper engagement. The lever ended up at least a 1/4 of an inch past the "alignment" dimple cast into the side of the gear box. No problems since. The Moss cattledog has an O/D trouble shooting section on the page showing the overdrive bits. Edited February 28, 2017 by littlejim Quote Link to post Share on other sites
Graham Harris Posted March 1, 2017 Report Share Posted March 1, 2017 Those quad rings are 3/32 section , its the never-ending story Roger get one problem fixed and along comes a new one. Graham Quote Link to post Share on other sites
mjdearing Posted March 2, 2017 Report Share Posted March 2, 2017 Rodger when your doing your jiggling thing i presume its the lever on the drivers side if so did you undo the pinch bolt on the other side,if not your still in the range the solonoid works in.just a thought Martin. Quote Link to post Share on other sites
RogerH Posted March 2, 2017 Author Report Share Posted March 2, 2017 Hi Martin, well spotted. I didn't undo the pinch bolt and only realised that when coming home form the gearbox workshop. I also didn't check the two spring loaded balls Never mind! I'm getting pretty good at removing the GB. I only hope the workshop does not take too long in sorting it. Roger Quote Link to post Share on other sites
AlanG Posted March 21, 2017 Report Share Posted March 21, 2017 (edited) I have just done the selector shaft seals and they are still not quite big enough for the depth of the recess in my cover, (3.34mm depth) I have added a nylon backup ring to the outside of the seal, they come from the same company as the quadrings, they are part number AE112. Now the retaining plate really holds the seals tight. John Do I fit 1. Q seal 2. Q seal + back up ring 3. Standard O ring 4. Standard O ring + back up ring ??? Alan. Edited March 21, 2017 by AlanG Quote Link to post Share on other sites
RogerH Posted March 21, 2017 Author Report Share Posted March 21, 2017 Hi Alan, if you have never been plagued with oil leaks from the rods then stick with O-rings I have used Q-rings without backing plate. In theory a sliding movement of a ring seal should make no difference. But if your supplier can do a backing ring then use it. Roger Quote Link to post Share on other sites
John L Posted March 21, 2017 Report Share Posted March 21, 2017 Roger An O ring that moves in its location, will pump oil, It must be retained to effect a seal. I'm sure the current O rings are not the same as those originally used. That's why there is always a leak there. Alan measure the depth of your O ring recess, I found that the quad ring still had some play so I added the backup nylon washer on the outside just under the keep plate. I haven't done a lot miles since but will keep an eye on it, must be better than the current O rings offered. John Quote Link to post Share on other sites
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