1977 T140 Primary Drive/chain Case Oil

As the t140 has the big crankcase breather pipe poking out of the rear of the primary case the chain is oiled by engine oil being thrown through the left hand main bearing into the chain case, not like the early bikes that had a seal on the crankshaft and timed breather. The level is controlled by 3 small holes in the case allowing oil to return to the sump. By all means remove primary case cover to clean out any dirt when you do the oil change as well as cleaning the oil gauze on the bottom of the down tube there is a drain plug and another gauze in the sump so that you can drain and clean it as well, after all this pour 1/4 liter of oil back into engine crank case to prime the oil pump. Fill frame up to bottom of dip stick and run engine to check the oil return pipe is working, then if ok top up to correct level on stick. I would recommend that you use Castrol Classic 20/50 engine oil and change it every year or 1000 miles.

 

You can also buy a filter that fits in the down tube and replaces the gauze if you want a bit better filtration.