Today's Message Index:
----------------------
1. 07:27 AM - compression (Bobby Paulk)
2. 03:58 PM - Re: compression (Tex Mantell)
3. 07:31 PM - Re: compression (Tim Yoder)
Message 1
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While doing my "Condition" inspection I found that #3 cylinder had dropped to 56
/ 80 on the differential compression gauge ( engine warm ). The other five were
72, 74, and 76 average. The leak is through the rings because I can hear it
in the Crankcase breather line to the catch can. The next day ( engine cold
) I put a pressure gauge on the cylinders and spun the engine with the starter.
All cylinders were up to 90 psi or above including the #3.
The engine is not using oil excessively ( about one to two ounces per hour ) and
the oil is clean - about the color of maple syrup after 25 hrs on it. I sprayed
all the cylinders with Sea Foam Deep Creep and am letting it sit until I
get back there to run it and check differential compression again.
Has anyone dealt with this problem or know how to fix. I plan on flying it for
a for an hour or two and try the differential compression test again.
Thanks for any input.
Bobby
Jabiru 3300 295 hrs.
Zodiac 601 B
Message 2
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Whats sea foam?
Sent from Mail for Windows 10
From: Bobby Paulk
Sent: Monday, April 23, 2018 10:26 AM
Subject: JabiruEngine-List: compression
While doing my "Condition" inspection I found that #3 cylinder had dropped
to 56 / 80 on the differential compression gauge ( engine warm ). The other
five were 72, 74, and 76 average. The leak is through the rings because I
can hear it in the Crankcase breather line to the catch can. The next day (
engine cold ) I put a pressure gauge on the cylinders and spun the engine
with the starter. All cylinders were up to 90 psi or above including the #3
.
=C2-The engine is not using oil excessively ( about one to two ounces per
hour ) and the oil is clean - about the color of maple syrup after 25 hrs
on it. I sprayed all the cylinders with Sea Foam Deep Creep and am letting
it sit until I get back there to run it and check differential compression
again.
Has anyone dealt with this problem or know how to fix. I plan on flying it
for a for an hour or two and try the differential compression test again.
Thanks for any input.
Bobby
Jabiru 3300 295 hrs.
Zodiac 601 B
Message 3
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Sounds like you are doing the correct things prior to the next check.
On your next flight I would recommend high power setting to help clean
potential dirty rings.
Tim
From: owner-jabiruengine-list-server@matronics.com
<owner-jabiruengine-list-server@matronics.com> On Behalf Of Bobby Paulk
Sent: Monday, April 23, 2018 7:26 AM
Subject: JabiruEngine-List: compression
While doing my "Condition" inspection I found that #3 cylinder had
dropped to 56 / 80 on the differential compression gauge ( engine warm
). The other five were 72, 74, and 76 average. The leak is through the
rings because I can hear it in the Crankcase breather line to the catch
can. The next day ( engine cold ) I put a pressure gauge on the
cylinders and spun the engine with the starter. All cylinders were up to
90 psi or above including the #3.
The engine is not using oil excessively ( about one to two ounces per
hour ) and the oil is clean - about the color of maple syrup after 25
hrs on it. I sprayed all the cylinders with Sea Foam Deep Creep and am
letting it sit until I get back there to run it and check differential
compression again.
Has anyone dealt with this problem or know how to fix. I plan on flying
it for a for an hour or two and try the differential compression test
again.
Thanks for any input.
Bobby
Jabiru 3300 295 hrs.
Zodiac 601 B
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