74 DT 360A  want to replace oil seal for the clutch arm that goes up from bottom of engine. what is the procedure, how do I access the seal, I see the adjustment nut under the sprocket cover, just don't really know what i am getting into?  Anyone know the procedure for this.

Try:
* drain oil or tilt bike over to R.
* remove clutch cable, taking note of spring placement
* loosen adjustment screw, gently turning arm L and R while loosening. Do not force.
if all works out, slide clutch arm slides out the bottom. The seal easily pops in/out.

Disclaimer: last time I did this the pressure plate was off my bike. ie, R cover removal. Worse case, you ~may need to do this to remove the pressure of the shaft on the lever arm. I want to say if the arm is at an angle it will slip on past shaft.

Turn the locating screw with Big Nut completely out. You'll see how it operated in the arm slot to locate then lift or lower to reduce or increase cable play within a half turn to lift or lower. Needs engaging plenty but if you bottom it out the back it out a fraction so you are just able to lift or lower to the max while still well engaged in the arm slot. When the adjuster is fully removed then turn the arm away from the cable until you can pull it down & out unhindered. Seal should lick out carefully. Assembly is the reverse of above [thinking back 50 odd years lol but happy to be corrected. If you lay the bike 'fully over' to the right then have a cuppa tea you'd probably get very little oil out there as it should all be over in the clutch cover.
Also be careful locking up the big adjuster nut as can pull the case threads out.