aerobubba(at)earthlink.ne
Guest
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 Posted: Fri Aug 04, 2006 6:08 am Post subject: Rear Prop Gov. Questions / plate |
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Hi All-
First off, I forget who originally brought the topic of the governor pad
plate up, but the majority of you are safe as it only applies to the dual
mag engines.
To address your specific questions:
| Quote: | I don't recall getting a 'plate' with my Jihostroj governor.
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It's a Lyc part.
| Quote: | Details please! How thick, what shape, what material, specific to governor
brand,
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| Quote: | where in what manual is it referred to, anyone got pictures.....?
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It's a piece of sheet metal, steel I believe, that is configured just like
the gov gaskets, except that it is missing the smaller of the two holes
that lie on it's long axis. It is required because of the dual mag
accessory case, not a specific governor. It is part # LW-12347 and appears
as item #31 in figure 8, pages 2-3 and 2-4 of the Lyc IO 360 wide cylinder
flange engine parts catalog.
| Quote: | You have me confused by the use of the word "case" above. I was
under the impression that these items were located between the
governor and the adapter. Am I wrong? Do they go between the adapter
and the accessory case?
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Sorry for the confusion- the dual mag engines don't use an adaptor, and as
such the plate goes between the accessory case pad and the governor itself.
| Quote: | I too need some clarification. I have a governor, an adaptor, and an
accessory case. At which joint does the metal plate go? Apparently the
metal
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| Quote: | plate must have a rough surface or serrations, etc., that hold the gaskets
better. Is this true?
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If you need an adaptor, you do not use the plate, and vice versa. The
plate is smooth, as I recall it.
| Quote: | Something that I had never thought about is that the prop pressure must
run
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| Quote: | well above engine oil pressure -- perhaps 150 PSI? That means that the
front
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| Quote: | main bearing is being lubricated by this pressure too, since there are no
seals between the prop feed and the 2 bearing surfaces on the front main
bearing.
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I can't comment on the oil pathways for the lubrication of the fwd bearings
(anyone from BPA listening in?), but if my interpretation of the docs that
came with my gov (in Czech and SI) is correct, it was tested to an output
of 330 psi. I also checked with a Hartzell techie, and all he could
contribute at the moment was that they bench test their props at between
110 and 120 psi (air) and advise prop shops to not exceed 175 psi. This
is, of course, in a static condition and higher pressures could be
encountered in flight. I'll let you guys know if / when they call back
with more info.
Sorry if this exchange put a scare into any of the single mag folks out
there!
glen matejcek
aerobubba(at)earthlink.net
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