Graham C Posted April 20, 2019 Report Share Posted April 20, 2019 Hello Can anyone tell me what material GT 6 gearbox bell housing are made from and can they be welded? Graham Link to comment Share on other sites More sharing options...
Ian Faulds Posted April 20, 2019 Report Share Posted April 20, 2019 Aluminium and yes Link to comment Share on other sites More sharing options...
RogerH Posted April 20, 2019 Report Share Posted April 20, 2019 Aluminium alloy and welded carefully. Roger Link to comment Share on other sites More sharing options...
JohnD Posted April 20, 2019 Report Share Posted April 20, 2019 What's the problem? In my experience, the cast iron gearbox was weaker than the bell! Link to comment Share on other sites More sharing options...
RogerH Posted April 20, 2019 Report Share Posted April 20, 2019 This is the spec for the 2000 2500 etc and probably the same for all the TRiumph boxes Al BS.1490 LM4M Roger Link to comment Share on other sites More sharing options...
Graham C Posted April 20, 2019 Author Report Share Posted April 20, 2019 Hello Excellent I thought it was, I am currently converting a Gt6 to a 1850 Dolly gearbox and J type overdrive. So I thought of having the bell housing welded to sort the selector rod issue, possibly having a seal tube welded in position for the selector rod to fit into. I am taking picture and will add to another post to collect information for others. Graham Link to comment Share on other sites More sharing options...
johny Posted April 20, 2019 Report Share Posted April 20, 2019 Have you considered epoxy metal to bond in the seal tube? If the aluminium is well prepared Ive found it a very effective way of joining it and much easier to carry out than welding. Course its not as strong but in this application I would have thought it more than sufficient.... Link to comment Share on other sites More sharing options...
Clive Posted April 20, 2019 Report Share Posted April 20, 2019 Seen this done. In fact I almost had to do it recently... Make a "top hat" with a short length of tube welded/brazed or even bonded with a strong epoxy to a bit of sheet steel. Seal the other end with steel sheet, same method. This can be attached using small setscrews/machine screws and use some hylomar or silicon sealant. It doesn't need anything complex. Link to comment Share on other sites More sharing options...
johny Posted April 20, 2019 Report Share Posted April 20, 2019 Clive, I take it the hole in the bell housing has to be drilled/filed out and the area where it goes is a bit irregular isnt it? Link to comment Share on other sites More sharing options...
Clive Posted April 20, 2019 Report Share Posted April 20, 2019 The dolly 1850 (3 rail) box has a bit already cast to accept it, but then a 1mm or so gap between the bellhousing and actual box. most odd. But a shim in the gap coated with sealant either side has been successful. That used a 1/2" drill. Been ages since I have seen a vitesse bellhousing, but if memory serves me the area can easily be made suitable. Link to comment Share on other sites More sharing options...
68vitesse Posted April 21, 2019 Report Share Posted April 21, 2019 Fitted a three rail Dolomite box with J type to my Vitesse, same bellhousing as GT6 l think, all l had to do was swop the bellhousing dumping the Dolomite one. From the questions assume you have a single rail box, have used JB Weld original on a project, non critical area, to avoid welding because of heat distortion. Regards Paul Link to comment Share on other sites More sharing options...
Graham C Posted April 21, 2019 Author Report Share Posted April 21, 2019 Yes you are correct it is a single rail onto a GT6 bell housing. The position of the selector shaft seems to just catch the corner of the rectangle hole for the clutch bearing lever. I thought welding may be a better fix. Graham Link to comment Share on other sites More sharing options...
johny Posted April 21, 2019 Report Share Posted April 21, 2019 I can see the welding being quite difficult to get correct and of course much harder to dismantle if its not correct. I think the selector shaft tube will need to seal against the face of the single rail casing (using its normal gasket) and ideally you want to achieve this without having to machine/file the tube flat on the sealing face of the bell housing. You could do this by cutting the necessary clearance hole in the bell housing, preparing the tube with a perfect true end and then bonding it in place while the bell housing is sitting on a completely flat surface.... Link to comment Share on other sites More sharing options...
Adrian Saunders Posted May 3, 2019 Report Share Posted May 3, 2019 On 20/04/2019 at 17:47, RogerH said: This is the spec for the 2000 2500 etc and probably the same for all the TRiumph boxes Al BS.1490 LM4M Roger How do you know that? I’m intrigued. Link to comment Share on other sites More sharing options...
Graham C Posted May 3, 2019 Author Report Share Posted May 3, 2019 (edited) I have progressed with the bell housing and actually had an aluminium tube fitted/welded. I have taken various pictures of the whole task and will write up what I did. Fortunately I found a small engineering workshop who were prepared to work with me to carry out the welding. I prepared the hole first then it took them nearly 1 hour of trial and error to get it done, this included an additional plate to cover and stop another shaft protruding from the gearbox. I took the gearbox and bell housing to the engineering shop so we tacked the tube in place at first when the bell housing was attached to the gearbox. Hoping to get the gearbox fitted this weekend and get final pictures of the installation. By the way you can get a copy of the BS 1490 on line which confirms that ON04 can be welded. Graham Edited May 3, 2019 by Graham C Updated with extra information Link to comment Share on other sites More sharing options...
Nick Jones Posted May 3, 2019 Report Share Posted May 3, 2019 The Vit/GT6 bell housing certainly can be welded very effectively This is the engine side 30mm worth of a Vitesse bell housing welded to a cut-down Toyota Supra bell housing. Guy who welded it reckoned the Triumph part was less troublesome that the Toyota part! End result Nick Link to comment Share on other sites More sharing options...
RogerH Posted May 4, 2019 Report Share Posted May 4, 2019 14 hours ago, Adrian Saunders said: How do you know that? I’m intrigued. Hi Adrian, I simply popped - triumph gearbox material - into Google and was lucky to get a hit on the TRiuph 2000 site. The material will be pretty close for all boxes with in a manufacturing group. It costs a lot of money to fine tune spec's for production. Roger Link to comment Share on other sites More sharing options...
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