Today's Message Index:
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1. 04:13 AM - Re: Bonanza with IO-520BB idles rough (Ian Dewhirst)
2. 08:08 AM - Re: Bonanza with IO-520BB idles rough (martymitchell)
3. 08:44 AM - Re: Bonanza with IO-520BB idles rough (Chuck)
4. 09:04 AM - Re: Bonanza with IO-520BB idles rough (martymitchell)
5. 10:52 PM - Re: Bonanza with IO-520BB idles rough (martymitchell)
Message 1
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| Subject: | Bonanza with IO-520BB idles rough |
I would look for an intake leak.
-----Original Message-----
From: owner-beech-list-server@matronics.com
[mailto:owner-beech-list-server@matronics.com] On Behalf Of martymitchell
Sent: September 14, 2008 1:16 PM
Subject: Beech-List: Bonanza with IO-520BB idles rough
--> <orders@martymitchell.com>
I have an IO-520BB in my Beech Bonanza that runs rough at idle and low RPM.
I have changed the spark plugs, cleaned the injectors, checked the mag
timing (just installed after 500 hour inspection and new distributor block),
and had a mechanic check the idle fuel pump pressure and idle mixture
setting.
I also did a compression check and all cylinders are above 60/80. There
doesn't seem to be any difference in drop with each mag at various RPM's. I
have not changed the ignition wires.
Any ideas on other things to look for?
Thanks!
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4248#204248
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| Subject: | Re: Bonanza with IO-520BB idles rough |
I have verified that all the hose clamps are tight and that all the intake bolts
are secure, but not sure where else to look and how to determine if it's leaking.
Thanks.
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4377#204377
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| Subject: | Re: Bonanza with IO-520BB idles rough |
What is the largest difference between cylinder compression? You say all
are at least 60/80 but how far apart are they and are they very
different from the last time they were taken? When is the last time the
prop governor was checked?
Did it start being rough just after coming out of the shop for repairs?
Could it be cam related? Bad lobe on cam?
Best of luck.
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| Subject: | Re: Bonanza with IO-520BB idles rough |
Both mags were inspected, a new distributor block was installed on one due to a
corroded terminal, and returned to the plane. I only did a brief compression
check to see if anything really bad happened to a cylinder, but will have to
go back and do it more carefully to get the exact numbers and will compare with
existing numbers.
Seems like the trouble began after the mags were pulled out and returned.
I suppose it could be a bad cam lobe. The engine is 1500 hours TSO.
The prop governor has not been checked for 1500 hours as far as I know.
I'm planning to check the ignition wires today.
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4385#204385
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| Subject: | Re: Bonanza with IO-520BB idles rough |
Problem Found! I did a second compression check and took my time. Although all
of the compressions are in the low to mid 60's, it appears that each cylinder
has a valve leak, one exhaust and 5 intakes. I suppse that is why it idles so
rough.
Thank you all for your help and suggestions. I should have started off with a careful
compression check.
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4520#204520
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