B 40 1961 oil

[Ady]

Hi all , i have a 1961 b40 with the distributor , i am doing a complete oil change  and have drained the gear box and engine via the two sump plugs but i dont have a sump plug for the clutch side and i assume that it must be connected to the engine side of things and the oil that lives in there has drained away with the engine oil . Any advice will be greatly received  thanks in advance , Ady .

[Phil C]

My B40F is1965. I don't know if the same applies to yours, but my primary chaincase oil is drained through one of the allen screw holes at the bottom of the casing.  Phil

[Ady]

Thanks Phil , i will pull a couple out and check .

[Mike40M]

The lower drain screw is below the brake pedal. The one towards the rear is a 'sleeve nut' which is a level plug. Originally they where cheese head and painted red.
From the user handbook 1967.
At present I'm testing using a modern motorcycle oil ( JASO MA2 ) for primary as it's made for wet clutches. Only done a 100 miles yet, so a bit early to tell.

[Ady]

Thanks Mike , i will be using silkolean 20 50 mineral oil in all three and see how it goes .