Hello everyone, I have a pecuilar problem that I cannot seem to solve. I
rebuilt a B23F from the pickandpull, to replace a tapping B27F. Now oil
leaks onto the front exhaust pipe and starts smoking out the cabin.

After 10.000 miles and two valve adjustments I cannot solve a leak from
the half moon shaped oil plug. I replaced the plug and cover gasket three
times already, I don't use any gasket maker, should I? I witnessed the
drip myself with an inspection mirror.

The engine seems to pull a very slight vacuum (I only used my palm on the
filler port) in the crankcase at startup so I belive that the ventilator is
operating correctly, but I did not change the breather box during the
rebuild.

Any help would be truly apprecated.