Hamish Posted November 22, 2017 Report Share Posted November 22, 2017 Hi. I have just started the dismantling of TR3a interior to get the leaking TR6 A type OD gearbox out to fix a leak between gearbox and OD plate. (?) The operation of the gearbox/OD eg driving has been perfect. I have drained the box/OD and removed the large brass filter plug and filter. I have 3 flexible magnetic rings in the bottom of the large plug and this has collected what I think to be (quite a lot) of gunky debris. Closer inspection and cleaning ( like panning for gold!!) I believe it to be mainly particles of blue gasket material eg blue hylomar. With the odd fleck of metal. Once out I was going to remove the OD from the gearbox plate (hoping I can deal with the 8 springs and pump on reassembly) and the plate from the gearbox anyway to try and fix the leak. Several questions now arise in my mind. ( not having ever opened a gearbox !) Do you think the box needs fully splitting to get rid of debris ? And /or removing all the sealant from all all the joints eg the complicated ones at the back of the OD. Can an OD gearbox be flushed to get rid of debris ? Will this do ? Do I bite the bullet and take it to a specialist ? (It works well apart from leak and this previously unknown debris) Based on advice from some one in Canada who does engines and gearboxes Im going to use some brush on gasket sealant to reduce risk of excess in gearbox. Plain English help required. Thanks H Quote Link to post Share on other sites
stillp Posted November 22, 2017 Report Share Posted November 22, 2017 The leftmost object in photo 3 looks like a chunk of metal? Pete Quote Link to post Share on other sites
Hamish Posted November 22, 2017 Author Report Share Posted November 22, 2017 Hi Pete Thats some of the blue sealant that is like a very thin membrane. No chunks of metal. Just the odd very small filing that catches the light. I feel/hope the guts of the machanicals are ok. ???? Quote Link to post Share on other sites
ctc77965o Posted November 23, 2017 Report Share Posted November 23, 2017 I would just wash it out with paraffin or ATF...don't leave it sitting in paraffin as it swells rubber seals , but a few hours wash won't hurt... I wouldn't open it up unless you plan a proper overhaul. If it works don't fix it. Quote Link to post Share on other sites
Hamish Posted November 23, 2017 Author Report Share Posted November 23, 2017 Thanks for your thoughts. Is there any concensous of opinion on this one before I take the box out. Thanks H Quote Link to post Share on other sites
barkerwilliams Posted November 23, 2017 Report Share Posted November 23, 2017 Hamish, My A type overdrive had an impressive amount of sludge. From my questions at the time I understood that this was general wear on many components of the overdrive and not indicative of one item wearing. The advice I had was to refill with good quality oil and forget it until I had specific problems, which may be in many years time, there would be no benefit in overhauling prematurely. Alan Quote Link to post Share on other sites
Hamish Posted November 23, 2017 Author Report Share Posted November 23, 2017 Hi Alan Thank you. I am worried that much of the detritus is like blue hymoler gasket goo that may have come from surplus when jointing it all back together? Could this block fine oilways ? Quote Link to post Share on other sites
iain Posted November 23, 2017 Report Share Posted November 23, 2017 Hi Alan Thank you. I am worried that much of the detritus is like blue hymoler gasket goo that may have come from surplus when jointing it all back together? Could this block fine oilways ? HI Hamish I think the metallic elements, which are very small are nothing to worry about. The excess hylomar needs getting rid of. Its stuff like this that blocks the fine oil ways. The filter has been doing its job, I would suggest as above to give a really good clean when you have split the box to repair that leak. Iain Quote Link to post Share on other sites
BlueTR3A-5EKT Posted November 23, 2017 Report Share Posted November 23, 2017 HI Hamish I think the metallic elements, which are very small are nothing to worry about. The excess hylomar needs getting rid of. Its stuff like this that blocks the fine oil ways. The filter has been doing its job, I would suggest as above to give a really good clean when you have split the box to repair that leak. Iain +1 Peter W Quote Link to post Share on other sites
Colin Fairhurst Posted November 23, 2017 Report Share Posted November 23, 2017 Hi hamish, I wouldn't worry about those tiny metallic particles. I have had much worse in 'A' type ODs and they have continued to work perfectly. The same can apply to the gearbox and it is worth bearing in mind that it is the same oil that circulates around both. It is just as likely that the debris, particularly the bronze bits,are from the gearbox. Regards, Colin Quote Link to post Share on other sites
Hamish Posted November 23, 2017 Author Report Share Posted November 23, 2017 (edited) Cheers everyone Ill move forward with gearbox removal and sussing out that leak. ???????? Edited November 23, 2017 by Hamish Quote Link to post Share on other sites
james christie Posted November 23, 2017 Report Share Posted November 23, 2017 Now that the debris question seems to settled, please let us know how you solve the OD plate leak problem, some of us (all of us?) would like to know ! James Quote Link to post Share on other sites
TR 2100 Posted November 23, 2017 Report Share Posted November 23, 2017 Splitting the box from the overdrive (and the adaptor plate from the overdrive) is easy enough, but there are a few tricks of the trade that you need to know to re-assemble without damage. Check it out. I only know 'cos Pete Cox told me (decades ago!) AlanR Quote Link to post Share on other sites
Lebro Posted November 23, 2017 Report Share Posted November 23, 2017 Yep, both sets of splines need to be lined up, & the pump plunger needs to be lifted onto the cam before pushing home. Bob. Quote Link to post Share on other sites
Hamish Posted November 23, 2017 Author Report Share Posted November 23, 2017 Splitting the box from the overdrive (and the adaptor plate from the overdrive) is easy enough, but there are a few tricks of the trade that you need to know to re-assemble without damage. Check it out. I only know 'cos Pete Cox told me (decades ago!) AlanR Is that a workshop / Haynes manual - type check it out or somewhere else ? H Quote Link to post Share on other sites
Guest ntc Posted November 23, 2017 Report Share Posted November 23, 2017 (edited) There are videos on youtube H and check the plate is flat Edited November 23, 2017 by ntc Quote Link to post Share on other sites
Hamish Posted November 23, 2017 Author Report Share Posted November 23, 2017 Cheers Neil. I have studied some of the videos Lately those Elin Yakov has done Ill double check them. Ta H Quote Link to post Share on other sites
Ian Vincent Posted November 23, 2017 Report Share Posted November 23, 2017 +1 about joining the O/D and gearbox back together. It took me a couple of hours with the box vertical on the bench before the O/D finally slid into place. Rgds Ian Quote Link to post Share on other sites
stillp Posted November 23, 2017 Report Share Posted November 23, 2017 I managed to replace the adaptor plate with the GB in the car, but broke a plate in the process. Managed eventually with a new plate. I wouldn't flush the GB with paraffin; oil or perhaps white spirit would be safer for the seals.I'm with the "if it ain't broke don't fix it" school of thought. Pete Quote Link to post Share on other sites
BrianC Posted November 24, 2017 Report Share Posted November 24, 2017 Pete Cox rebuilt my gearbox and overdrive and recommended using cheap multigrade for a few miles to flush when/if I change the oil (Penrite GB40). Quote Link to post Share on other sites
Hamish Posted November 24, 2017 Author Report Share Posted November 24, 2017 I have maintained what the PO did in his 40+ years ownership Gearbox and back axle oil EP80/90 oil (GL4) So Ill contun with that. Ill try and get the gearbox out this weekend. Ill have to work out How as a one man job. H Quote Link to post Share on other sites
brenda Posted November 24, 2017 Report Share Posted November 24, 2017 Give us a call if you need a hand to lift it out home all weekend. Mike Redrose group Quote Link to post Share on other sites
Hamish Posted November 24, 2017 Author Report Share Posted November 24, 2017 Cheers ???????? Quote Link to post Share on other sites
barkerwilliams Posted November 24, 2017 Report Share Posted November 24, 2017 Hamish, TR Register shop sell a DVD on gearbox / OD overhaul by Pete Cox only £12. Well worth it. Alan Quote Link to post Share on other sites
Guest ntc Posted November 24, 2017 Report Share Posted November 24, 2017 H As you will know you need a dummy shaft to do it right Quote Link to post Share on other sites
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