ericmpmail-rv10(at)yahoo.
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 Posted: Thu Nov 09, 2006 9:02 pm Post subject: O540 crank issues? |
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All,
While slowly building my RV-10 I also fly a Cherokee
180 and follow the piperowner board. Three issues with
O540 failures not subject to the AD caught my
attention and I decided to pass it on.
"This is kind of disturbing, but two PA32 accidents in
the last about 30 days have claimed a total of 4
lives. The scary thing is they were both engine
failures with rods being thrown around the #6 journal,
holes in the cases.
That and seeing the pictures of Kent's crank busted up
from a failure is making me wonder if an crank AD may
be coming for the O540's." Larry KRHV
http://www.aviationfeeds.com/feeds/accident.py?ev_id 061108X01626&key=1
http://www.aviationfeeds.com/feeds/accident.py?ev_id 061108X01628&key=1
description from Kent about initial problem with his
Dakota:
"Took our '79 Dakota out today to shake some bugs off.
About 15 min into the flight engine acted as though it
had been leaned too much and began loosing power, and
shortly there after,began to vibrate. Oil pressure,
oil temp, manifold pressure, prop and RPM were all OK.
Applied carb heat and headed back to AP. Seemed like
she was trying to run on 3 of 6. Flew about 6 min to
home base, cleared traffic in the pattern and landed
w/o further problems. A quick check revieled no
apparent oil leaks to indicate cracked case and/or
jugs, prop OK oil level OK. Does seem to be something
binding when prop is hand pulled. Too Dark and late of
Friday to go further. Towed it back to the T-hanger
and will have mechanics run compressions, drain oil
and, cut oil filter open next week.
Anyone had something like this happen on their 0540
before? If so, what do you suggest we look for? I have
a bad feeling that the loss in power might have
something to do with valves, but the vibration is more
disturbing.
Engine is at about 1200hrs since major and has been
flown regularly at least 15-20hr/month."
Update:
"Pulled the plugs and found oil in bottom of #4.
Pulled #4 jug and it got worse. Turns out that the
root cause is a broken crank.
Disturbing in that this 0540 crank was not subject to
the last two AD's. The break was clean and occured
across the rear counterweight of the #4 journal. "
I have some close up pics if anyone is interested.
Hopefully this will not lead to yet another crank AD.
I would say a rare event, but unfortunately not rare
enough.
FYI: Cherokee Chat on the www.piperowner.com site is a
close knit group of very experienced piper owners and
very informative. It is worth the membership even if
you do not fly a piper and I plan on continuing my
membership even after I sell. A handful of board
members have started bulding RV's too.
Eric
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