I may be overlapping with an earlier thread or even with an old post of my own.
AFAIK not ALL 912`s have a clutch.
Curious if that's so in general?
And specifically if _my_ 912 has a clutch.
It could be as old as 1994 (at least the manual with it is dated 1994) , but to the best of our knowledge it was purchased new in 1999
912ul 80hp serial number 4402427 .
Several points in the manual the text implies that not all these engines gearboxes came with overload clutches. For example, in describing certain recommended checks such as
FRICTION TORQUE CHECK it says ``only if overload clutch is fitted.``
.......................................
There are several reasons I'd like to know if there's a clutch in our particular gearbox (short of tearing it open to look), not the least of which is not trying to check the friction torque on a clutch that isn`t there ;-) .
A minor reason is that parts of the standard oil recommendations, such as avoiding additives that reduce friction, further might become moot.
A major reason to know if a clutch is in there in ours is to understand how much further beyond the 600 hours usually recommended to open and check the gearbox might prudently be extended if no clutch is in there. Reason I ask that is we're not too enthused about having what AFAIK a perfectly good gearbox torn down any sooner than really necessary; and since ours is an ELSA we're not mandated to by any regs. FWIW: During its 600+ hours it has never been run on avgas (well maybe less than 1% of the time) and in filter dissections no detectable traces of metal, let alone any ferrous metal) and no squeaks or rattles. I notice that in the gearbox exam list of about 30 items at least seven items seem to pertain specifically to the clutch.... and I'm wondering if the clutch and clutch related items might be the more time vulnerable items.
Al
AFAIK not ALL 912`s have a clutch.
Curious if that's so in general?
And specifically if _my_ 912 has a clutch.
It could be as old as 1994 (at least the manual with it is dated 1994) , but to the best of our knowledge it was purchased new in 1999
912ul 80hp serial number 4402427 .
Several points in the manual the text implies that not all these engines gearboxes came with overload clutches. For example, in describing certain recommended checks such as
FRICTION TORQUE CHECK it says ``only if overload clutch is fitted.``
.......................................
There are several reasons I'd like to know if there's a clutch in our particular gearbox (short of tearing it open to look), not the least of which is not trying to check the friction torque on a clutch that isn`t there ;-) .
A minor reason is that parts of the standard oil recommendations, such as avoiding additives that reduce friction, further might become moot.
A major reason to know if a clutch is in there in ours is to understand how much further beyond the 600 hours usually recommended to open and check the gearbox might prudently be extended if no clutch is in there. Reason I ask that is we're not too enthused about having what AFAIK a perfectly good gearbox torn down any sooner than really necessary; and since ours is an ELSA we're not mandated to by any regs. FWIW: During its 600+ hours it has never been run on avgas (well maybe less than 1% of the time) and in filter dissections no detectable traces of metal, let alone any ferrous metal) and no squeaks or rattles. I notice that in the gearbox exam list of about 30 items at least seven items seem to pertain specifically to the clutch.... and I'm wondering if the clutch and clutch related items might be the more time vulnerable items.
Al
