Olielekkage - Leaking oil

Some weeks ago I experienced a huge leaking got oil after a one hour trip on the highway (60+ M/h). I must have lost more than half a liter, while I had no severe oil leakage after rebuilding the engine 10 years ago. 

Today I cleaned all the oil on the underside of the engine and did a short test ride to let it get warm and show the leakage.

I found two spots: One seems to come from the seal of the carter pan at the rear side:

The other is a mystery for now. It looks like it is leaking from the cover of the clutch handle. But the clutch is working properly, there is no visible oil leakage from the hole in the clutch bell housing.

The test ride I made was not long enough to let the oil drop from the wiggle pin. When I looked some days later, it was dropping oil.

Took the engine out. Oil all over in the clutch housing (clutch was clean, great design!).

Flywheel and motor plate removed.


So: oil leakage thru the rear labyrint AND oil leakage thru the sealing of the carter. Bot indicating malfunction of breathers.







Confirmed by this:

I found a breather completely blocked. The canister was full of dirt.

Because the shown leakage could be caused by a very high pressure  in the crack case, I was advised to measured the compression pressure. With throttle full open and all spark plugs removed (before that I had very bad results): 125/125/125/125 psi without oil and 145/150/135/150 psi with a little oil added in the cilinder.

Some pictures of the engine removed from the car:

Planning to renew the oil pump also: