Gearbox oil leak from bolt in adaptor plate.

[Bandit1200]

When I bought my Stag 6 yrs ago it had an oil leak from the same point as yours. The PO had fitted copper washers in an attempt to fix it but it still leaked.
I had the clutch replaced with the updated kit and took the opportunity to clear the vent at the top of the gearbox and fit new gasket to o/d. Leak cured.
The gearbox o/d unit creates heat in operation which pressurises the gearbox/o/d casing bowing oil from the weakest point.
Hope this helps.
Steve

[Markvh]

Thanks. I like the idea of ptfe tape as well. Just need to be careful that no bits get into the o/d. I think I might still try and do it with the oil in situ. If it fails then I’ll drain the box.
if I do drain the oil from the gearbox, what do people use to get the new oil into the gearbox. I have seen 1.5 litre syringes advertised. Thanks again. Please see my next question

[Markvh]

Will annealed flat washers be OK as sealing washers or do they have to be the rolled type crush washers to make a good seal?

[Markvh]

How do you torque up the nuts that bolt the overdrive unit to the adaptor plate? I can't get a socket on let alone the torque wrench!
Do you have to use spanners and guess? I'll have to have practice dry runs with a nut and bolt on the vice until I can get close to the correct torque unless there is another way. I'm scared of over and under tightening though 20lb.ft is quite high.
Thanks
Mark.

[flying farmer]

I just guess but then I have had plenty of experience

The simplest way is to use a spring balance on the end of the spanner.

If you extend the spanner to 12 inches using a bit of tube over the spanner or something like a long socket extension fixed to the spanner with hose clips, you just need a 20lb pull or 10lb if you have a 2 foot bar.
At a push you could even use the wifes kitchen scales to push the bar, just don't let her catch you at it!

Neil