jogger321 Posted October 31, 2022 Report Share Posted October 31, 2022 Please wait while image is uploading... Just got the tunnel off my TR6. Minor leaks from gearbox/overdrive which I believe to be an A type?? This bolt seems to have a pool of oil around it and wondering if source of leak.. Was wondering if it can be removed and if felt washer underneath Before I touch anything can anybody tell me what this bolt does?? Thankyou Quote Link to post Share on other sites
jogger321 Posted October 31, 2022 Author Report Share Posted October 31, 2022 Please wait while image is uploading... Quote Link to post Share on other sites
John Morrison Posted November 1, 2022 Report Share Posted November 1, 2022 Waited awhile, no picture! John. Quote Link to post Share on other sites
jogger321 Posted November 1, 2022 Author Report Share Posted November 1, 2022 (edited) Please wait while image is uploading... Edited November 1, 2022 by jogger321 Quote Link to post Share on other sites
jogger321 Posted November 1, 2022 Author Report Share Posted November 1, 2022 Quote Link to post Share on other sites
harlequin Posted November 1, 2022 Report Share Posted November 1, 2022 I would guess the most likely suspect for the oil leak is the selector rod seals George Quote Link to post Share on other sites
Drewmotty Posted November 1, 2022 Report Share Posted November 1, 2022 It covers the overdrive selector valve. It d so could have a copper washer under it. Quote Link to post Share on other sites
Mike C Posted November 1, 2022 Report Share Posted November 1, 2022 Yep there's a spring and ball under it. If the O/D is functioning correctly just make sure the washer is OK and the plug is tight. Is the small gearbox vent hole at the front of the selector cover clear? Quote Link to post Share on other sites
Hamish Posted November 1, 2022 Report Share Posted November 1, 2022 There is a breather on the od just above the circled nut too. Quote Link to post Share on other sites
jogger321 Posted November 1, 2022 Author Report Share Posted November 1, 2022 Bit of a novice to this ..what steps do I need to to try and fix it..what if anything needs to be dismantled to get to the source of the problem?...The overdrive works fine Many thanks Quote Link to post Share on other sites
Chilliman Posted November 1, 2022 Report Share Posted November 1, 2022 That nut with the oil around is just a plug to hold the operating valve & spring. It can safely be removed & as Drewmotty says there should be a copper washer under the head of the plug, just clean the whole area & replace the copper washer (or re anneal) & put back together - at least you will be able to rule that out as a leak source & is an easy job to do. Quote Link to post Share on other sites
RogerH Posted November 1, 2022 Report Share Posted November 1, 2022 I think the hex head screw is simply catching the run-off from above. How long has it taken to get that oily? I would suggest the selector rod 'O' rings are leaking. if it was my GB I would wash off all the oil and then do a decent test run and see where the oil is coming from. An extra breather hole can be inserted st the forward left corner of the top cover - 1/8" diameter hole with a split pin inserted. To replace the 'O' rings you need to completely strip the cover down. Roger Quote Link to post Share on other sites
Mike C Posted November 1, 2022 Report Share Posted November 1, 2022 56 minutes ago, RogerH said: I think the hex head screw is simply catching the run-off from above. How long has it taken to get that oily? I would suggest the selector rod 'O' rings are leaking. if it was my GB I would wash off all the oil and then do a decent test run and see where the oil is coming from. An extra breather hole can be inserted st the forward left corner of the top cover - 1/8" diameter hole with a split pin inserted. To replace the 'O' rings you need to completely strip the cover down. Roger +1. I've seen worse leaks. After cleaning you may need to spray talcum powder from a puffer to trace the leak's source. Quote Link to post Share on other sites
stuart Posted November 1, 2022 Report Share Posted November 1, 2022 2 hours ago, RogerH said: I think the hex head screw is simply catching the run-off from above. How long has it taken to get that oily? I would suggest the selector rod 'O' rings are leaking. if it was my GB I would wash off all the oil and then do a decent test run and see where the oil is coming from. An extra breather hole can be inserted st the forward left corner of the top cover - 1/8" diameter hole with a split pin inserted. To replace the 'O' rings you need to completely strip the cover down. Roger They do look to be leaking judging by the rear housing but the leak the OP is on about is forward of that and more likely just needs the copper washer replacing. Stuart. Quote Link to post Share on other sites
CharlieBubbles Posted November 1, 2022 Report Share Posted November 1, 2022 Had something similar and (eventually) tracked it down to the bolt being a thread or two too long, so it bottomed out before being tight at the top - although it looked and felt like it was. A real s*d to find! Quote Link to post Share on other sites
stuart Posted November 1, 2022 Report Share Posted November 1, 2022 35 minutes ago, CharlieBubbles said: Had something similar and (eventually) tracked it down to the bolt being a thread or two too long, so it bottomed out before being tight at the top - although it looked and felt like it was. A real s*d to find! This is the plug, it just needs a new washer https://www.overdrive-repairs.co.uk/product/a-type-main-case-operating-valve-plug-on-top-of-case/ Stuart. Quote Link to post Share on other sites
dingle Posted November 6, 2022 Report Share Posted November 6, 2022 Isn't it just a 1/2" ID copper crush washer? Berry Quote Link to post Share on other sites
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