REFLECTOR: MT Prop failure mode?
David Staten
david.staten at gmail.com
Tue Nov 18 16:08:35 CST 2008
I would lean towards the governor and its plumbing being the culprit.
Barring that.. a leaky seal in the hub on the pitch change mechanism
(essentially a piston ring).
This is conjecture. I am not an A&P and only know what I've read about
or flown behind. I've not torn one down.
All fluid levels are ok?
Bernard Despins wrote:
> I have a TIO-540 on a test stand with a 4 blade MT constant speed
> (hydraulic) prop.
>
> It has been running fine, producing 300 hp. Today, it started up normal,
> warmed up, but when it came time to make some horsepower, it just revved
> to 2700 rpm, and wouldn't develop any power, and the manifold pressure
> wouldn't go up. Thought maybe the turbos were damaged. They seem
> fine. The engine is just essentially free-wheeling and over-revving
> with the slightest application of throttle. It is as if there is no
> load on the engine.
>
> The prop still responds to the pitch control, but it doesn't seem to
> provide much more load even when set to course pitch.
>
> Can anyone point me in the right direction to diagnose this a bit more?
>
> Bernard Despins
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