Hey mate. Just for info a few things I have found with mine......... I have a Dolomite Sprint and a Stag, so have both manual gearboxes, and ended up with a spare Sprint one for parts as well. When my Stag was an automatic, I wanted to change it to a manual, and had an old spare Sprint box so looked at what it took to put that in mine. The gearboxes share a lot of the same components, apparently case etc, but the major differences are ratios, and the layshaft thrust bearing arrangement. The Stag has roller races, wheras the Sprint only has thrust washers, not races. Also the Stag input shaft is a lot larger/heavier, obviously for the larger clutch and higher input torque. So I ended up buying everything from a "donor wreck" manual, and converted mine to manual about 2005. But the top covers are the same/interchangeable. Well, they should be as they share the same part number. Mine is leaking at the moment from the o rings at the rear of the selector rails, and I have a refurbished top cover ready to go on, but I have been meaning to do it for ages, but keep putting it off, as too lazy to drop the box. Good that you brought up the "some have the cover some don't". When I say "they are interchangeable" there are those two types, with that small difference. Some have no opening on the top of the top cover, wheras some have a square hole into the cavity where the selector rails are on the rear extension, and there is a small square sheet steel cover like yours has. NONE of the parts books I have show that. show that, but I have one of each top covers here, same as you have. I modified my selectors, because I was so used to having the overdrive only on 4th in my Jag and loved it, so mine on the Stag is modified so that O/D ONLY comes on in 4th, not in 3rd like they come standard. Most will say "why not just not use it inb 3rd then?", but I have my reasons. The Sprint is still "O/D on both 3rd and 4th", but I hardly ever drive that now anyway (been off the road for ten years, stored at my Dad's.) Triumph got lazy with some of the things on these boxes. Those plugs for the selector springs are a terrible idea, the sedan manuals (so possibly some early Stags) had screw in plugs there, far better than "press in/hard to get out" etc etc. Same with the shift lever. The earlier gearboxes on the sedans (same design) had the side bolts with pins on their ends, and there was an adjustment routine. Then they just abolished that and just have "bolts that do up" and the non adjust routine supercedes that. Also in early manuals they talk about shimming those switches so they operate properly. While some poeople sell the shims, the later parts lists and manuals just say "fit the switch with gasket washer", no mention of any adjustment, and later parts lists don't mention them, wheras early ones say "as required", ie multiple to shim them. When I overhauled mine on my Stag, those square headed bolts that hold the selector forks were VERY tight, so I got a 5/16 (I think) unf nut and filed the inner dia square, slid that over the square head bolt, and then used a 1/2 inch socket to undo them. Again, earlier versions I have seen had holes drilled in those square headed bolts for lock wires, later ones deleted them. I love seeing half your bits and pieces, as saves me going and dragging my bits out to remind me of some things. :-) Although today I revisited my spare starters that I will rebuild based on being reminded by your starter vid. Good to see.
I was under the impression, from other folks, that the Stag gearbox is machined slightly different to that of other Triumphs. The difference being in the area of the layshaft as you pointed out. can you confirm they are the same?
Thanks for the information, It pays to get a spare used box sometimes just a small fix can save loads of money in reconditioned units , how did you get on with the crank bearing change did you get the sump back on and running ,
Unfortunately, the crank needs a regrind so the car is back together and running so I can get in in and out of the garage. I'm driving around in my auto for now.
Hey mate. Just for info a few things I have found with mine.........
I have a Dolomite Sprint and a Stag, so have both manual gearboxes, and ended up with a spare Sprint one for parts as well.
When my Stag was an automatic, I wanted to change it to a manual, and had an old spare Sprint box so looked at what it took to put that in mine.
The gearboxes share a lot of the same components, apparently case etc, but the major differences are ratios, and the layshaft thrust bearing arrangement. The Stag has roller races, wheras the Sprint only has thrust washers, not races. Also the Stag input shaft is a lot larger/heavier, obviously for the larger clutch and higher input torque.
So I ended up buying everything from a "donor wreck" manual, and converted mine to manual about 2005.
But the top covers are the same/interchangeable. Well, they should be as they share the same part number. Mine is leaking at the moment from the o rings at the rear of the selector rails, and I have a refurbished top cover ready to go on, but I have been meaning to do it for ages, but keep putting it off, as too lazy to drop the box.
Good that you brought up the "some have the cover some don't". When I say "they are interchangeable" there are those two types, with that small difference. Some have no opening on the top of the top cover, wheras some have a square hole into the cavity where the selector rails are on the rear extension, and there is a small square sheet steel cover like yours has. NONE of the parts books I have show that. show that, but I have one of each top covers here, same as you have.
I modified my selectors, because I was so used to having the overdrive only on 4th in my Jag and loved it, so mine on the Stag is modified so that O/D ONLY comes on in 4th, not in 3rd like they come standard. Most will say "why not just not use it inb 3rd then?", but I have my reasons.
The Sprint is still "O/D on both 3rd and 4th", but I hardly ever drive that now anyway (been off the road for ten years, stored at my Dad's.)
Triumph got lazy with some of the things on these boxes. Those plugs for the selector springs are a terrible idea, the sedan manuals (so possibly some early Stags) had screw in plugs there, far better than "press in/hard to get out" etc etc. Same with the shift lever. The earlier gearboxes on the sedans (same design) had the side bolts with pins on their ends, and there was an adjustment routine. Then they just abolished that and just have "bolts that do up" and the non adjust routine supercedes that.
Also in early manuals they talk about shimming those switches so they operate properly. While some poeople sell the shims, the later parts lists and manuals just say "fit the switch with gasket washer", no mention of any adjustment, and later parts lists don't mention them, wheras early ones say "as required", ie multiple to shim them.
When I overhauled mine on my Stag, those square headed bolts that hold the selector forks were VERY tight, so I got a 5/16 (I think) unf nut and filed the inner dia square, slid that over the square head bolt, and then used a 1/2 inch socket to undo them. Again, earlier versions I have seen had holes drilled in those square headed bolts for lock wires, later ones deleted them.
I love seeing half your bits and pieces, as saves me going and dragging my bits out to remind me of some things. :-) Although today I revisited my spare starters that I will rebuild based on being reminded by your starter vid.
Good to see.
I was under the impression, from other folks, that the Stag gearbox is machined slightly different to that of other Triumphs. The difference being in the area of the layshaft as you pointed out. can you confirm they are the same?
Thanks for the information, It pays to get a spare used box sometimes just a small fix can save loads of money in reconditioned units , how did you get on with the crank bearing change did you get the sump back on and running ,
Unfortunately, the crank needs a regrind so the car is back together and running so I can get in in and out of the garage. I'm driving around in my auto for now.