Today's Message Index:
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1. 06:36 AM - Re: Re: Bonanza with IO-520BB idles rough (BobsV35B@aol.com)
2. 08:03 AM - Re: Bonanza with IO-520BB idles rough (martymitchell)
3. 09:07 PM - Re: Re: Bonanza with IO-520BB idles rough (Tom Henderson)
4. 09:15 PM - Re: Bonanza with IO-520BB idles rough (martymitchell)
Message 1
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| Subject: | Re: Bonanza with IO-520BB idles rough |
Good Morning Marty,
I am getting in on this thread very late, but didn't I see that your
roughness came on suddenly following a repair to an ignition component?
I would not feel that your cylinder compressions would have caused a sudden
change in operation.
Have you looked at the cylinders with a borescope?
Continental now tells us that the older compression check done alone is not
valid. You really need to take a good look at the valve face. That will tell
you if the valve is leaking under operating conditions. Many valves that
show leakage via a static compression check will seal just fine under normal
operations. I would look further for your problem.
I think there may be a newer version of the Continental Motors Service
Bulletin concerning cylinder testing, but the one I have before me right now is
dated 2003. It is SB03-3. Be sure you have that one or a newer version before
you start tearing things apart!
Happy Skies,
Old Bob
In a message dated 9/16/2008 12:52:44 A.M. Central Daylight Time,
orders@martymitchell.com writes:
--> Beech-List message posted by: "martymitchell" <orders@martymitchell.com>
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
**************Psssst...Have you heard the news? There's a new fashion blog,
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Message 2
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| Subject: | Re: Bonanza with IO-520BB idles rough |
Thanks Old Bob. Good advice. I am aware of Service Bulletin SB03-3 and have read
it. Turns out that I mistakenly reported my problem as being 5 intake leaks,
when in fact, air was leaking thru the crankcase breather, so they are actually
ring leaks.
So I have 1 exhaust valve leak and 5 that are leaking past the rings.
I'm not sure that explains idle roughness. I'm just about ready to pull the mags
and have them re-checked for proper internal timing but the mag shop says it
not my problem.
Still very confused....
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4577#204577
Message 3
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| Subject: | Re: Bonanza with IO-520BB idles rough |
This sounds dumb.. but have you verified that all the plug wires are going
to the right places, and that they aren't damaged, etc?
-TH
----- Original Message -----
From: "martymitchell" <orders@martymitchell.com>
Sent: Monday, September 15, 2008 9:02 AM
Subject: Beech-List: Re: Bonanza with IO-520BB idles rough
> <orders@martymitchell.com>
>
> 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
>
>
>
Message 4
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| Subject: | Re: Bonanza with IO-520BB idles rough |
I did test all the ignition wire with one of those ignition wire testers. I believe
it only checks for shorts to ground but does not check for opens. I'm sure
all the wires are in the right place or it would run REAL bad.
There are a couple damaged spots but just to the outer vinyl, no further.
Any other ideas?
Marty
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4723#204723
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