As Eric said a sticking check valve is more likely the problem,
Mine did the same on first startup then run fine for 120 hours,
After the winter lay off its first startup this year was very similar but with
less oil leaking, i have done another 20 hours with no more problems,
regards
Ivor
---- Erich Trombley <erichdtrombley@juno.com> wrote:
>
> 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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