Randol Webb
Joined: 10 Jan 2006
Posts: 2
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 Posted: Mon Jan 16, 2006 1:00 pm Post subject: Prop Hub |
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Mike and others that might be interested,
I just installed blades in a prop hub that I had refurbished. The hub I
removed from the airplane (CJ6, 285 hp engine and prop), sold to me as
new and installed in 1997, now with 250+/- hours, had begun to be
sluggish in operation and was becoming discolored and I suspect corroded.
I found: 1. Grease that was black, hard as a brick, probably not
luberating anything and stuck fast to all interior surfaces.
2. NO SEALS installed for the blades. The hard grease in the
seal groves might have been acting as a seal.
3. Even with the prop removed and no oil pressure, I was unable
to cycle the blades by hand.
This prop was supposedly shipped from China this way. I recommend that
if you have a prop from China that has not had service here, you think
about cleaning it out and greasing properly.
Randy Webb
Lades and Gents
A couple of weeks ago I put a note on the yak list regarding frozen prop
blades (unable to adjust pitch)
I can now advise you of the findings the prop has been striped and inspected
we found the sleeves that the blade
Screw into had frozen on the nylon bush just after the oil/grease seal.
It took a considerable amount of work to remove the castellated nuts and one
could not be removed with out totally stripping
Of the centre of the hub.
My question to the list has any one ever had this type of failure, do you
all leave your props parked on the horizontal so water can not enter the
bushing area. This CJ sits in a hanger it had been flown in rain once and
only gets washed using car wash
It has not had any other types on solvents near it.
Any thoughts or comments would be appreciated
Mike Beach
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