Hi, we also had the same problem with a stuck waste gate. We tried Mouse
Milk but would have the same problem after only a few flights.
Out solution was to remove the turbo and clean the shaft dry. I think that
was Lockwood Aviation's suggestion.
Keep the shaft dry and run motor gas. Any AVGAS will cause it to stick at
random times as the lead builds up. We run motor gas as often as we can,
but use TCP (I think that's what it's called) when we run AVGAS.
Before each flight I turn the master on and let the servo move the waste
gate. Problem is I cannot see the servo or waste gate. What we figured out
is that we can pull the engine computer breaker and push it back in and at
the same time we quickly move in front of the place and look at the waste
gate. You can see the arm move for just a brief second. This method works
great and we have not had a stuck waste gate since.
Matt Carpenter
N138WJ
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Jim Brown
Sent: Saturday, June 25, 2011 5:42 AM
Subject: Re: Europa-List: 914 turbo
garry, this was the only time...I have used a product called Mouse Milk. Its
a lubricant for turbines I think. However it is used in applications where
heat is a problem. Its avaiable at Aircraft Spruce...I used it about every
other month, just a squirt on the shaft that the clevis was attached to.
From: Garry Stout <garrys@tampabay.rr.com>
Sent: Friday, June 24, 2011 8:08 PM
Subject: Re: Europa-List: 914 turbo
Jim, how often did you experience a stuck waste gate? Mine used to stick
about once per year, and was a bugger to free up. Never did find a
solution.
Garry
Sent from my iPad
On Jun 24, 2011, at 2:59 PM, Jim Brown <acrojim7534@yahoo.com> wrote:
For you 914 drivers;
My 914 started showing surges in the manifold pressure recently. On
takeoff's, the MP would vary from 33" MP to 39"MP. In cruse mode where I
normall cruise at 33" MP and 5300 RPM I was having to advance the throttle,
or retard, in order to keep the MP stable.
The engine has 860 hours, TT since new...to make a long story short, I have
added 3 pictures of the servo cable..Over a period of time, some of the
wires in the cable, were broken, or just worn out. The clevis on the end of
the cable connects directly to the turbo wastgate, and the worn out cable
was just bending, instead of moving the wastegate...
I ordered new cable from Rotax, and installed...Make sure when installing
new cable, that the wastgate is completely closed..If its not completely
closed, you will not get full bost on takeoff.
Jim Brown
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