Today's Message Index:
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1. 01:21 PM - Scavenge Issues (Eric Biggs)
2. 05:44 PM - Re: Scavenge Issues (A. Dennis Savarese)
Message 1
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All
I would like to discuss a past posting with a gentlemen names Egon that
posted a scavenge issue to the Yak List in 2005. The original message
is below. I am having similar issues almost identical and wish to know
how he solved this problem.
Egon, please contact me off list at ebiggs@inservusa.com if you are
still on the list or if you are someone who may know how I can contact
Egon.
Sincerely,
Eric Biggs
Yak-52 4434U
Original Posting is as follows:
----- Original Message -----
From: egon
To: yak-list(at)matronics.com
Sent: Thursday, December 29, 2005 6:19 PM
Subject: Yak-List: Scavenge Problem??
G'day all!
Hope you all are enjoying the Holidays. I have an interesting
conundrum with that superior product of Mother Russia, my Yak 52. I
changed the oil about a week ago and flew her for 0.5 with no problems.
Next flight was 2 days later and after another half hour flight
(including aeros) I arrived and found the entire right side of the
fuselage covered in oil with oil dripping from the breather.
Oil quantity was down to 5 litres. ( quantity before flight was 10
litres)
I wiped her down and topped her up to 9 litres and took her out for an
engine run. Same thing happened again this time with oil around the
front of the engine as well. I thought initially the crankcase maybe
pressurising but after a compression test the leak rates are all mid to
high 70's. There is no smoke coming from the exhaust and oil pressure is
normal at all times.
During trouble shooting we noticed that the oil level in the sump was
extremely high.
About 2.5 litres came out when drained instead of the usual 1litre.
Scavenge screen was clear. We have disconnected the scavenge line and
blown air through it and can hear bubbling in the tank which I suspect
rules out a blockage downsteam of the pump. We have blown air through
the pump and oil appears to flow freely forward out to the front of the
sump where the scavenge screen resides.
The gears of the scavenge pump turn as the prop is turned.I guess the
next step is to swap the oil pump and see what happens. I was wondering
if anyone might have come across this problem before because we are
running out of ideas.
Thanks in anticipation.
Cheers for now
Egon.
End Msg:
Message 2
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| Subject: | Re: Scavenge Issues |
When you blow though the hose from the sump to the air-oil separator,
you should also hear air coming out of the breather tube and not just
the sound in the oil tank. A plugged up air-oil separator may be the
cause of your problem.
Dennis
----- Original Message -----
From: Eric Biggs
To: Yak-List@matronics.com
Sent: Friday, October 22, 2010 3:17 PM
Subject: Yak-List: Scavenge Issues
All
I would like to discuss a past posting with a gentlemen names Egon
that posted a scavenge issue to the Yak List in 2005. The original
message is below. I am having similar issues almost identical and wish
to know how he solved this problem.
Egon, please contact me off list at ebiggs@inservusa.com if you are
still on the list or if you are someone who may know how I can contact
Egon.
Sincerely,
Eric Biggs
Yak-52 4434U
Original Posting is as follows:
----- Original Message -----
From: egon
To: yak-list(at)matronics.com
Sent: Thursday, December 29, 2005 6:19 PM
Subject: Yak-List: Scavenge Problem??
G'day all!
Hope you all are enjoying the Holidays. I have an interesting
conundrum with that superior product of Mother Russia, my Yak 52. I
changed the oil about a week ago and flew her for 0.5 with no problems.
Next flight was 2 days later and after another half hour flight
(including aeros) I arrived and found the entire right side of the
fuselage covered in oil with oil dripping from the breather.
Oil quantity was down to 5 litres. ( quantity before flight was 10
litres)
I wiped her down and topped her up to 9 litres and took her out for
an engine run. Same thing happened again this time with oil around the
front of the engine as well. I thought initially the crankcase maybe
pressurising but after a compression test the leak rates are all mid to
high 70's. There is no smoke coming from the exhaust and oil pressure is
normal at all times.
During trouble shooting we noticed that the oil level in the sump
was extremely high.
About 2.5 litres came out when drained instead of the usual 1litre.
Scavenge screen was clear. We have disconnected the scavenge line and
blown air through it and can hear bubbling in the tank which I suspect
rules out a blockage downsteam of the pump. We have blown air through
the pump and oil appears to flow freely forward out to the front of the
sump where the scavenge screen resides.
The gears of the scavenge pump turn as the prop is turned.I guess the
next step is to swap the oil pump and see what happens. I was wondering
if anyone might have come across this problem before because we are
running out of ideas.
Thanks in anticipation.
Cheers for now
Egon.
End Msg:
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