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Oil leaks in a mosler engine....anyone else had this problem????

Posted By:
George Gagne
Homebuilder or Craftsman
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0
#1 Posted: 12/31/2009 13:55:06

I'm flying a N-3 Pup with a 1083 cc Mosler engine 1992 edition. About 100 hours on the engine and has leaked oil either blowing out the vent to a collection bottle or around the push tube gaskets all the time. I've changed gaskets with out any success. Any ideas???



Jim Heffelfinger
Homebuilder or Craftsman
256
Posts
43
#2 Posted: 12/31/2009 14:55:56 Modified: 12/31/2009 14:58:23

George,

You might post this question to the Homebuilt section as well.

 



John Jelinski
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#3 Posted: 1/5/2010 17:37:28

I have seen VW engines leak oil profusely when the crankcase vent became plugged after a bug made a nest in the vent line.  Cleaning out the tube fixed all the leaks.

I would certainly check the crankcase vent first.  If the crank case vent is free flowing, then the engine  might have severe blow-by.  Do a leak-down compression test to see if blow by is the problem. 

 

Good luck &  smooth flying!

John Jelinski



Quenton Weaver
Homebuilder or Craftsman
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#4 Posted: 1/6/2010 09:25:44

George,

Is the Mosler enough power?  What do you weigh?

Thanks,

Woody

woodyweaver@comcast.net

    



John Orr
Homebuilder or Craftsman
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0
#5 Posted: 1/7/2010 13:05:31

I've built a half vw engine for a legal eagle and it also blew oil out the breather and dipstick tube... and everywhere else.

I discovered that some of the guys had a one way valve in the breather that only allows air out.   After building one

(simple flapper valve) and installing it on the breather (generator stand) port,  problem solved.   The four cylinder

vw doesn't leak because it has two pistons moving out of the crankcase at the same time that the other two are moving

in.   Half vw's have only two that move both in or out at the same time.   This forces the air out the breather on the in

stroke and then sucking it back in on the out stroke.  I bet the valve will fix your problem.  Now my crankcase runs with

a slight vacuum when the engine runs.... if it leaks oil now, it has to be after the engine is stopped.   If you want pictures of my valve I have them....Good luck!

John.orr@halliburton.com   (John Orr)