Tr7 Transmission

I would recommend you fit a 7 plate clutch conversion, it consists of 7 new plates with a smaller friction area plus one new plain plate. Compared with standard it reduces the problems of sticking, slipping, swelling, dragging and heavy operation (provided the other components are in good condition). To be used in conjunction with your existing 6 plain plates. You need to make sure the plain plates are completely flat with no sign of warping. Also use Bonneville T120 springs. This will totally improve the way the clutch feels, it will be lighter, the gear changes will be a lot smoother and you will be able to select neutral when you are stationery. Triumph started fitting the 7 plate clutches later on due to cure the issues you describe. You mention you have balanced the spring pressure, by that I take it you mean "run out", the best method is (with primary case removed) and turning the engine over with the kickstart, look at the plate and see if it really is running true, if not adjust the springs individually until it runs true, I use a DTI as it gives almost 100% accuracy.

 

Hi Watourec and welcome to the forum I hope trying the outer plate fixes your issue, looking forward to seeing your ride pix

 

My thoughts if the above has been checked are the cam plate or detent as its a well known problem.

 

Hi, the cam plate moves the selector forks through the gears and holds them in each gear inc neutral and the plunger detent holds the cam in the selected position, there are plenty of online pictures and video's showing it all, just fitting a new detent plunger might cure the problem but i would strip the box and inspect the gearbox to be on the safe side as there are also other parts that could be worn.

 

Watourec
Welcome to the family. Yes i think i would have to agree with Darkman. And the seven plate clutch s are great. Drop some molly slip into the box to see if it eases up a bit. But i do feel you will end up stripping.
Joe.

 

shortcut. listen to darkman, but think about this too:

unscrew the hex plug on the bottom of the crankcases and remove th ecamplate detent spring assembly

pull out the plunger and the spring and drop two 10-32 nuts into the plunger housing to preload the spring a bit.

see whether that improves your ability to find neutral.

else you may have a worn-out or incorrect plunger, as darkman suggested

 

Hi watourec, The dial Test Indicator (DTI) is a sensitive instrument having a graduated dial and an indicating hand which is connected through a system of multiplying levers, or gears, to a contact point that is fastened to the end of a spindle. The contact point is placed in contact with the workpiece. Any movement of the contact point is transmitted through the spindle and measure run out, it is extremely accurate, for example if you experience "pulsing" at the brake lever you can use the DTI to check if the brake disk is warped. In your case it would give an accurate reading so you could readily see which spring or springs need adjusting to bring the clutch into alignment, much more accurate then "rack of the eye". Whilst you can improvise with all manner of techniques and they will work to an extent, they cannot give the same accuracy as a DTI. I have attached a link for a site in the USA so you can get a look at them, the prices are ok as well. Ride safe all.

 

theres another aftermarket plunger with a ball bearing tip. people say they work well. i have one but the motor its going into is still in little pieces all over the shop

 

I've just installed a 7 plate on a '77 T140V as the one installed in the '72 was so much better. The sticking clutch and dragging are improved a lot. The dragging almost gone at high temperatures. The clutch still sticks after standing for a week or so but is easily released with one or two kick overs.
It's still a bit touchy at finding neutral but easier done while rolling, there's even an extra one between second and third now . I've ordered a new ball bearing plunger (not had one before) and will let ya'll know if that makes anything easier.

 

New ball bearing plunger came today. Supplied with installation instructions and a new ally washer, cor. Even though the bike has been standing for over a week the clutch wasn't stuck at all. That'll be the new 7 plate - much better.



Installed immediately, obviously. Couldn't be arsed to drain the gearbox as I had a cunning plan. The large long headed bolt is the plunger assembly and the smaller twin bolts are the drain and level bolts.



My plan was to take out the plunger and stop the hole up with some rubber bungs I have. (I used to use them when painting up hip flasks as personal remembrance pieces that looked like war commission gravestones). I forgot they have a hole through the middle. FFS.



Here's the removed plunger and spring alongside the new ball bearing plunger.



Give all a clean, assemble and whack the new plunger in. Only lost about half of the oil so the cunning plan worked a bit. Refilled to level through the fill hole.



Typically, it's pouring down so I bombed around the garage. To be honest, I don't think it's any different but will report back once it stops raining and I have a poodle about. Over...

 

maybe it will improve shifting harder?

i have a 1970 4 speed that bounces out of gear if i shift at a a high rpm, 7000 and above. i solved the problem by shimming and and counting a full second beteeen shifts.

maybe the ball bearing will hold position better

 

Yep. I'll have a poodle and maybe shim the spring just to see how it feels. Don't want to bind the spring though. There can't be much room though once it's screwed in tight.

 

mine fully retracts into the plunger housing even with shimming

 

Well, that works. Snickety McSnickface. Very positive feel to the gear lever now. Neutral is exactly where it should be, gearchange is very positive, no dragging, no slipping. Luvly.
I shot off to the Nailsea Bike Show this morning and it was mobbed. There was even a queue to get into the overspill car/bike park. I was enjoying the ride so much I turned around and went for a jaunt around the Somerset Levels to see where King Arthur was buried. Over...

 

Watourec - when you adjusted the clutch cable did you adjust the clutch pushrod clearance?

If not, see www.hermit.cc/tmc/om/manual.htm#adjrod