I, too, had a similar experience and asked about it at the Rotax course
I recently took. They said it is likely the check valve, as Eric says. I
remember they said you can take it apart and clean it, also inspect for
slight imperfections where the ball seats in it's "socket", which you
can do some lapping on to improve the seal.
Kevin
Europa XS Mono-Wheel
Inter-cooled Rotax 914
Airmaster Prop
On Mon, May 18, 2009 at 6:33 PM , Erich Trombley wrote:
> <erichdtrombley@juno.com>
>
> Paul,
>
> I had a similar experience when I first commissioned the engine.
> Sounds like the check valve on the turbo is/was stuck. The stuck
> check valve allows oil to fill up the turbo on both the intake and
> exhaust sides. Upon start up the oil on the intake side is blown into
> the air box where it then collects and drains as you have observed.
> While you can remove the check valve and clean it, more than likely it
> will re seat itself.
> Good luck,
>
> Erich Trombley
> N28ET Classic Mono 914
>
>
> we have just run the engine up (914) for the third time. After about 5
> min there
> was oil dripping from the right hand airbox drain and the air filter
> is soaked
> in oil. There is no apparent leak from anywhere else. The oil tank has
> never
> been over filled. The engine does not appear to be burning oil. It
> appears that
> it has been drawn up into the airbox from the turbo - but why the air
> filter
> soaked in oil? The first couple of engine runs (couple of months ago)
> there was
> no evidence of oil leaking anywhere. Any thoughts?
>
> Regards
>
> Paul
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