A cracked crankcase, or damage on the crankshaft where the seal is?
Also a lot of mechanics damage the seal during installation.
Peter wrote:
A cracked crankcase, or damage on the crankshaft where the seal is?
Yes, probably… worst case, but fortunately still on warranty (as all the recent repair efforts).
Seal – not so probable, after three different efforts… one must have been successful, one would think.
Surface finish on the crankshaft is important, this service bulletin local copy may be worth looking over, if you haven’t already. One trick on some engines (I have no experience with large Continentals) is to install the seal at a slightly different axial location than the previous seal, to move the seal lip to a slightly different location on the shaft. If there are alternate STC approved seals, they may also be worth looking at, for the same or similar reasons.
Multiple leaks alas are typical with old hoses, engines, components. It took me about 2 years to sort all of mine.
well the engine is as new, given that we have had all hoses etc renewed when it was disassembled last year…
The angle with the angle – I’ll follow up on that ! Thanks
@EuroFlyer We had the same problem and found that the propeller was not running smoothly because it was improperly greased. This led to the described oil loss under load.
For all, this is not the issue, as I have a McCauley prop.
Currently we’re checking if the crankcase may be overpressurized due to either a clogged breather tube or other sources.
This is becoming pretty mysterious.
Established facts are so far:
According to the Danish firm, the crankshaft has been measured and was within limits. Well, obviously, it must have been, there is not radial play, only axial play.
It’s not so much oil that I cannot fly. The engine runs smoothly and all data are normal. Its just – annoying and, to an extent, nagging in the back of the head….
Maintenance guys, engine guys, myself, and all, have pretty much done everything imaginable and quite frankly, we’re at our wit’s end a bit…
So – ideas are appreciated ;)
How can you have a leak there on a stationary engine, when the oil should be way down in the sump?