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doncherie(at)slingshot.co
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 Posted: Mon Jun 12, 2006 9:44 pm Post subject: engine whine in 3300 engine |
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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
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N1BZRich(at)AOL.COM
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| Posted: Tue Jun 13, 2006 6:53 am Post subject: engine whine in 3300 engine |
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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.
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info(at)usjabiru.com
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| Posted: Tue Jun 13, 2006 7:44 am Post subject: engine whine in 3300 engine |
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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(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of doncherie
Sent: Tuesday, June 13, 2006 12:39 AM
To: jabiruengine-list(at)matronics.com
Subject: 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
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p.mulwitz(at)worldnet.att
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| Posted: Tue Jun 13, 2006 8:13 am Post subject: engine whine in 3300 engine |
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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:
| Quote: | 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
---------------------------------------------
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doncherie(at)slingshot.co
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| Posted: Tue Jun 13, 2006 12:32 pm Post subject: engine whine in 3300 engine |
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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
[quote] ---
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doncherie(at)slingshot.co
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| Posted: Tue Jun 13, 2006 12:35 pm Post subject: engine whine in 3300 engine |
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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
[quote] ---
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jim(at)jabirupacific.com
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| Posted: Wed Jun 14, 2006 6:38 pm Post subject: engine whine in 3300 engine |
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Hi Don
My engine will whine at about 1150 RPM, If it is the same whine as my engine it is from the straight cut gears on the camshaft and distributor gears.
It's kind of the same whine you get from a cam gear drive set up in a small block Chevy instead of a timing chain drive.
Jim McCormick
Jabiru Pacific LLC
255 W Fallbrook 202B
Fresno, CA 93711
Office 559-431-1701
Fax 559-233-3676
www.jabirupacific.com [quote] --
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