dpb Posted March 14, 2016 Report Share Posted March 14, 2016 Bit of a cock-up. I drained the gearbox, and then refilled it until it was running out of the filler hole. But only took about 1.1 litres instead of an expected 2 litres. MMm, a bit of digging around shows I should have drained the overdrive as well. (A-type). So, can I drain the overdrive separately now, or will the new oil have spilled into the overdrive already? Engine hasn't been started since the refill. Or I can just leave it ?- the old oil wasn't particularly dirty. Any words of wisdom? Cheers Dave ==== Quote Link to post Share on other sites
Chilliman Posted March 14, 2016 Report Share Posted March 14, 2016 Drain both & refill again, clean the filter and magnets in the overdrive sump at the same time Quote Link to post Share on other sites
RogerH Posted March 14, 2016 Report Share Posted March 14, 2016 Hi Dave, the OD shares the GB oil but takes a little time to get through. Simply fill to overflow (allow to level off). After a run check the level. GB oil never gets too dirty as there is nothing there to contaminate like the engine (carbon blow by makes it black). When it does get dirty you are in TRouble. Roger Quote Link to post Share on other sites
dpb Posted March 14, 2016 Author Report Share Posted March 14, 2016 Thanks chaps. I will have a mull over it. Might need to buy the overdrive plug spanner I suppose. Might just run it then check the level. Quote Link to post Share on other sites
Stanpartmanpartwolf Posted March 23, 2016 Report Share Posted March 23, 2016 This has been the prime cause of failure in overdrive gearboxes for decades. Always drain both the 'box & OD, then jack the car up from the left side and refill with 2L/3.5pts. This way, oil doesn't creep out of the filler orifice & convince one it's full when it's not. Very important. Quote Link to post Share on other sites
Alec Pringle Posted March 23, 2016 Report Share Posted March 23, 2016 Hi Dave, please see PM . . . . . Cheers Alec Quote Link to post Share on other sites
AlanT Posted March 24, 2016 Report Share Posted March 24, 2016 When I stripped my O/D every nook and cranny was packed with a kind of black sludge, I'd guess this is residue from the cone linings which of course, do gradually wear. I don't think anyone had ever changed the oil in it. Quote Link to post Share on other sites
Westy Posted March 30, 2016 Report Share Posted March 30, 2016 The gearbox on my TR4A has started to whine, particularly noticeable in 3rd gear. I know Enginuity replaced the gearbox oil a couple of years ago, but thought I'd try topping up first to see if that might be the cause. Will any old oil do? Keeping my fingers and everything else crossed it's not a gearbox issue. Quote Link to post Share on other sites
peejay4A Posted March 30, 2016 Report Share Posted March 30, 2016 You'll get loads of opinions. I use EP90 GL4. If you don't know what's in there you'd be best draining and refilling. Quote Link to post Share on other sites
Westy Posted March 30, 2016 Report Share Posted March 30, 2016 Thanks. Just pulled Enginuity's invoice - they replaced with EP80W90 in Sept 2011 so will try topping up with same. What does GL4 mean? Quote Link to post Share on other sites
peejay4A Posted March 31, 2016 Report Share Posted March 31, 2016 It's to do with additives. The container should be marked as such. Do not use GL5. Quote Link to post Share on other sites
dpb Posted March 31, 2016 Author Report Share Posted March 31, 2016 Is there anything particularly wrong with GL5? Dave ==== Quote Link to post Share on other sites
peejay4A Posted March 31, 2016 Report Share Posted March 31, 2016 I believe it is accused of attacking yellow metal components. Quote Link to post Share on other sites
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