---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Mon 04/23/18: 3 ---------------------------------------------------------- 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 _____________________________________ Time: 07:27:36 AM PST US From: Bobby Paulk 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 ________________________________ Message 2 _____________________________________ Time: 03:58:09 PM PST US From: Tex Mantell Subject: RE: JabiruEngine-List: compression 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 _____________________________________ Time: 07:31:26 PM PST US From: "Tim Yoder" Subject: RE: JabiruEngine-List: 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@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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.