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stuart(at)harnerfarm.net
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 Posted: Thu Oct 09, 2014 3:26 pm Post subject: idle mixture air adjust screw, O-ring |
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OK guys, since my idle mixture screw does not look like the ones in the book
(#6 in the drawing), I have a question.
Which is the proper position for the O-ring?
Next to the threads, or in the groove closest to the head?
When I took the carb (Bing 54) apart for an overhaul last winter, I forgot
to take pictures as I went. No problem, I have a parts drawing, and there
were no two parts alike, so things can only go in one place. When I went to
put it back together, I had a little debate with myself about the placement
of this O-ring and the parts drawing was no help. I used my "best logic" as
to where to put it. I think I was wrong and will continue the story after I
hear some replies. 
BTW, I did a full break in routine on the 447 today. I did not need to as
Herb had done it originally, but wanted to get some experience with this
engine. This gave me a chance to watch all the temps through all the
ranges. It was quite an education. All appears well except for a mid-range
lean problem, which I worked around by using the enricher circuit to cool it
off while in that RPM range.
All is well, except for a leaking bowl gasket, time for taxi testing!
Stuart
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byoungplumbing(at)gmail.c
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| Posted: Thu Oct 09, 2014 3:35 pm Post subject: idle mixture air adjust screw, O-ring |
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I would put it in the groove closest to the screw driver slot ( head)
Boyd [quote][b]
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stuart(at)harnerfarm.net
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| Posted: Fri Oct 10, 2014 5:31 am Post subject: idle mixture air adjust screw, O-ring |
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That is what I thought too. Why else would there be an O-ring sized groove in the screw?
As it turns out, I could not get it to idle properly, even with the screw turned all the way in, it was still too lean.
After moving the O-ring to be next to the threads and setting the screw to ½ turn, I was able to dial in the idle mixture by turning the screw only a tiny amount.
It would have been a lot easier if the screw were not on the propeller side of the carb, but what the heck it worked!
Thanks,
Stuart
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of B Young
Sent: Thursday, October 09, 2014 6:35 PM
To: kolb-list(at)matronics.com
Subject: Re: idle mixture air adjust screw, O-ring
I would put it in the groove closest to the screw driver slot ( head)
Boyd | Quote: | | http://www.matronics.com/Navigator?Kolb-List |
01234567
[quote][b]
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