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compression

 
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wb2ssj(at)rochester.rr.co
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PostPosted: Mon Apr 23, 2018 2:58 pm    Post subject: compression Reply with quote

Whats sea foam?

Sent from Mail for Windows 10

From: Bobby Paulk
Sent: Monday, April 23, 2018 10:26 AM
Subject: 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


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ftyoder(at)yoderbuilt.com
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PostPosted: Mon Apr 23, 2018 6:31 pm    Post subject: compression Reply with quote

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(at)matronics.com <owner-jabiruengine-list-server(at)matronics.com> On Behalf Of Bobby Paulk
Sent: Monday, April 23, 2018 7:26 AM
Subject: 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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kayberg(at)aol.com
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PostPosted: Tue Apr 24, 2018 4:47 am    Post subject: compression Reply with quote

Google "Sea Foam", Tex

Doug Koenigsberg


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zeprep251(at)aol.com
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PostPosted: Tue Apr 24, 2018 8:43 am    Post subject: compression Reply with quote

when doing the compression test,with the differential gauges,hang onto the prop firmly move it back off of tdc and then pull it forward again toward tdc.The rings act a little like wiper blades do but need to seal in the groves and rocking a little promotes that action
Quote:
On Apr 23, 2018, at 10:26 AM, Bobby Paulk <bobbypaulk(at)comcast.net (bobbypaulk(at)comcast.net)> wrote:

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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kayberg(at)aol.com
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PostPosted: Tue Apr 24, 2018 2:45 pm    Post subject: Compression Reply with quote

Running a Jabiru engine without the cowl on is a very risky proposition. More than one person has trashed their engine doing just that. CHT's must be watched carefully;airflow over the fins is a must.

If SeaFoam loosened the rings, then that might be a sign of an overheated cylinder.

Just my opinion.

Doug Koenigsberg


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