---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Tue 06/13/06: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:53 AM - Re: engine whine in 3300 engine (N1BZRich@AOL.COM) 2. 08:44 AM - Re: engine whine in 3300 engine (Jabiru USA) 3. 09:13 AM - Re: engine whine in 3300 engine (Paul Mulwitz) 4. 01:32 PM - Re: engine whine in 3300 engine (doncherie) 5. 01:35 PM - Re: engine whine in 3300 engine (doncherie) ________________________________ Message 1 _____________________________________ Time: 07:53:36 AM PST US From: N1BZRich@AOL.COM Subject: Re: JabiruEngine-List: engine whine in 3300 engine Don, Are you hearing this whine through the headset? Is it there with headset off? Do you hear it with the intercom off? I guess the answer to that is yes, since you mentioned it is still there with the master off. If the noise has just recently started, then something has changed. Wiring short or chaffing, etc. Blue Skies, Buz Rich PS: I have about 117 hours total time on my 3300 since the first flight last December. It is a great engine. ________________________________ Message 2 _____________________________________ Time: 08:44:42 AM PST US From: "Jabiru USA" Subject: RE: JabiruEngine-List: engine whine in 3300 engine Don, It sounds like you will have some investigating to do. Some possible causes would be alternator or regulator, distributor shaft or rotor, vacuum pump (if you have one). Somehow you need to get these items out of the picture one at a time until the noise goes away. This is the first time someone has described a noise as a whine so I'm a bit lost as to where to look. Pete _____ From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of doncherie Sent: Tuesday, June 13, 2006 12:39 AM Subject: JabiruEngine-List: engine whine in 3300 engine I have recently experienced a "whine" in the engine from 1200 RPM and below. The whine disappears at exactly 1200 rpm and reappears once throttling back to that rpm. We have taken the alternator out of the housing and checked for wear = none visible. Cowlings have been removed to check for vibration of the engine on the cowls etc.Whine still persists! Engine has been run without master switch on to check if electrical noise exists. The engine is 117 hrs old and has been regularly and meticulously maintained. Any suggestions? Regards, Don Boyd ________________________________ Message 3 _____________________________________ Time: 09:13:59 AM PST US From: Paul Mulwitz Subject: RE: JabiruEngine-List: engine whine in 3300 engine Hi Don, I recently bought a low cost "Mechanic's Stethoscope" from Harbor freight. I hoped it would help in locating an air leak in my car from old weather stripping. It is a cheap stethoscope with a long metal tube attached so you can point it in a particular direction and see how strong the noise is. I never did get to test this tool - I bought a new car instead. It doesn't cost very much, so it might be worth a try. Paul XL wings no engine yet. At 08:43 AM 6/13/2006, you wrote: >I have recently experienced a "whine" in the engine from 1200 RPM and below. > >The whine disappears at exactly 1200 rpm and reappears once >throttling back to that rpm. > >We have taken the alternator out of the housing and checked for wear >= none visible. > >Cowlings have been removed to check for vibration of the engine on >the cowls etc.Whine still persists! > >Engine has been run without master switch on to check if electrical >noise exists. > >The engine is 117 hrs old and has been regularly and meticulously maintained. > >Any suggestions? --------------------------------------------- Paul Mulwitz 32013 NE Dial Road Camas, WA 98607 --------------------------------------------- ________________________________ Message 4 _____________________________________ Time: 01:32:37 PM PST US From: "doncherie" Subject: Re: JabiruEngine-List: engine whine in 3300 engine Hi Buz, The whine is definitely not through the headsets and is still there with intercom and master off. You can actually hear it from outside the aircraft Regards, Don ----- Original Message ----- From: N1BZRich@aol.com To: jabiruengine-list@matronics.com Sent: Wednesday, June 14, 2006 1:04 AM Subject: Re: JabiruEngine-List: engine whine in 3300 engine Don, Are you hearing this whine through the headset? Is it there with headset off? Do you hear it with the intercom off? I guess the answer to that is yes, since you mentioned it is still there with the master off. If the noise has just recently started, then something has changed. Wiring short or chaffing, etc. Blue Skies, Buz Rich PS: I have about 117 hours total time on my 3300 since the first flight last December. It is a great engine. ------------------------------------------------------------------------- ----- 6/7/2006 ________________________________ Message 5 _____________________________________ Time: 01:35:24 PM PST US From: "doncherie" Subject: Re: JabiruEngine-List: engine whine in 3300 engine Hi Pete, Jabiru Australia have emailed me back and suggested that at 1100 rpm a whine often develops in the 3300 engine and is a result of the alternator and stator. they suggest replacing it, but I am still in discussion as to why it all of a sudden appeared. Regards, Don Boyd ----- Original Message ----- From: Jabiru USA To: jabiruengine-list@matronics.com Sent: Wednesday, June 14, 2006 3:43 AM Subject: RE: JabiruEngine-List: engine whine in 3300 engine Don, It sounds like you will have some investigating to do. Some possible causes would be alternator or regulator, distributor shaft or rotor, vacuum pump (if you have one). Somehow you need to get these items out of the picture one at a time until the noise goes away. This is the first time someone has described a noise as a whine so I'm a bit lost as to where to look. Pete ------------------------------------------------------------------------- ----- From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of doncherie Sent: Tuesday, June 13, 2006 12:39 AM To: jabiruengine-list@matronics.com Subject: JabiruEngine-List: engine whine in 3300 engine I have recently experienced a "whine" in the engine from 1200 RPM and below. The whine disappears at exactly 1200 rpm and reappears once throttling back to that rpm. We have taken the alternator out of the housing and checked for wear = none visible. Cowlings have been removed to check for vibration of the engine on the cowls etc.Whine still persists! Engine has been run without master switch on to check if electrical noise exists. The engine is 117 hrs old and has been regularly and meticulously maintained. Any suggestions? Regards, Don Boyd ------------------------------------------------------------------------- ----- 6/7/2006