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compression

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wb2ssj(at)rochester.rr.co
Guest

Posted: Mon Apr 23, 2018 2:58 pm Post subject: compression

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
Guest

Posted: Mon Apr 23, 2018 6:31 pm Post subject: compression

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
Guest

Posted: Tue Apr 24, 2018 4:47 am Post subject: compression

Google "Sea Foam", Tex

   

  Doug Koenigsberg

   

   

  --

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zeprep251(at)aol.com
Guest

Posted: Tue Apr 24, 2018 8:43 am Post subject: compression

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
Guest

Posted: Tue Apr 24, 2018 2:45 pm Post subject: Compression

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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