irish44j Posted November 19, 2008 Share Posted November 19, 2008 Anyone have a basic method to drain the diff on my GT6? It hasn't been opened in probably 20 years. Other cars I own have drain plugs on the diff, but not the GT6.... Note that I do not want to take it off the car at this time...Talk about a "duh" question, but help me out :) Link to comment Share on other sites More sharing options...
sparky_spit Posted November 19, 2008 Share Posted November 19, 2008 If you can get it warm enough to thin the oil, and if you can wriggle a length of smallish diameter clear tubing in through the filler/level hole down to the bottom of the diff (not easy) you can syphon it out. Suck on the pipe till you see the oil come up the tube and then let it syphon into a pan. You need to suck hard and it takes a long time to syphon out.Or, you can use one of the hand operated pumps to do it. Marine stores sell these for emptying oil from marine gearboxes. Link to comment Share on other sites More sharing options...
paulhumphries Posted November 19, 2008 Share Posted November 19, 2008 I've got one of these http://www.machinemart.co.uk/shop/product/details/cgg500-500cc-oil-suction-gun/path/lubrication-fuel-transfer-equipmentMy use is for filling up gearboxes and diffs from 5 ltr containers but the suction is fantastic even for the heaviest oil so no prolem sucking out used oil as wellPaul Humphries Link to comment Share on other sites More sharing options...
willcolumbine Posted November 19, 2008 Share Posted November 19, 2008 Not a daft question at all! I asked it a short while ago![Sorry, link no longer available]I've got all the stuff ready but I still haven't got around to it! :) Link to comment Share on other sites More sharing options...
rotoflex Posted November 19, 2008 Share Posted November 19, 2008 Pep Boys & O'Reilly's call the the thing you want a Suction Gun, Mr. 44j! Link to comment Share on other sites More sharing options...
irish44j Posted November 19, 2008 Author Share Posted November 19, 2008 brilliant. I don't even know why I wasn't thinking about suction guns...duh. Link to comment Share on other sites More sharing options...
AndreGT6 Posted November 20, 2008 Share Posted November 20, 2008 Hey I bet that you could use one of those to fill it back up too.A. Link to comment Share on other sites More sharing options...
booley Posted November 20, 2008 Share Posted November 20, 2008 AndreGT6 wrote:Hey I bet that you could use one of those to fill it back up too.A.i used to use one of those to fill a leaky trans (without tearing interior apart)you could also drill and tap the diff for a drainplug.... Link to comment Share on other sites More sharing options...
AndreGT6 Posted November 20, 2008 Share Posted November 20, 2008 Yes, when I did a rear case swap I drilled the bottom for a drain, next time I do this, I'll consider a better filler location. Link to comment Share on other sites More sharing options...
JohnD Posted November 20, 2008 Share Posted November 20, 2008 Remembering that the filler is also the level indicator.How about taking out one of the spring studs, and filling down the hole?John Link to comment Share on other sites More sharing options...
Tim Bancroft Posted November 21, 2008 Share Posted November 21, 2008 Canleys are now selling diff casings with a drain plug in the boss that was originally put there for the very purpose. Link to comment Share on other sites More sharing options...
CharlieB Posted November 21, 2008 Share Posted November 21, 2008 358 wrote:I suggest that you drill through this protusion into the differential, all the way though being careful not to snag the crownwheel. Tap a thread into the hole, any size will do, M6-8-10 or 5/16,3/8, 7/16th. Then simply install a suitable hex head bolt into it. Use an alloy or brass washer to seal it.Doing it that way you'll have to provide a flat surface for the washer to seal against. Easier to use a taper plug as original (5/8"UNF I think?) Link to comment Share on other sites More sharing options...
Tim Bancroft Posted November 22, 2008 Share Posted November 22, 2008 Swarf? Link to comment Share on other sites More sharing options...
Nick Jones Posted November 22, 2008 Share Posted November 22, 2008 That would be my worry too. With care you can be pretty sure nothing big went in and you can flush it through to some extent but I would always worry....Nick Link to comment Share on other sites More sharing options...
JohnD Posted November 23, 2008 Share Posted November 23, 2008 The sump and the gear box use taper plugs, but I don't think they have taper cut threads on the drain hole.The taper plug will seal very nicely in a straight hole, or you could add some teflon tape if you were worried.And please check the correct thread before buying a tap.Gas connections are often a taper thread, and I suspect that car taper plugs may use that.Please correct me if I'm wrong.John Link to comment Share on other sites More sharing options...
CharlieB Posted November 24, 2008 Share Posted November 24, 2008 358 wrote:While the proposal of cutting a taper thread is reasoned I can tell that you have certainly not done so?I didn't propose cutting a taper thread I proposed cutting a straight thread & using a taper plug which as John said is what Triumph did in the engine, gearbox & diff.Your bolt & washer idea won't seal unless you machine a flat (shallow counterbore or "spotface") into the rough cast surface of the diff. Link to comment Share on other sites More sharing options...
Nick Moore Posted November 24, 2008 Share Posted November 24, 2008 I cheated here, and had an early diff housing machined to take the larger output bearings of a later diff. But that was years ago when I had a pile of old Herald diffs (we went through a few). Still, an easy conversion if you're taking the diff out anyway. Link to comment Share on other sites More sharing options...
Deleted User Posted November 25, 2008 Share Posted November 25, 2008 I intend to have mine done with a modern type sump plug one that fits flush in the hole ...a hex head sticking out from the bottom of a diff is asking to be sheared off....wouldn't do it on the car either.Take it off split the casing ,check all the bearings and seals while you're at it and do the job proper Link to comment Share on other sites More sharing options...
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