dsavarese0812(at)bellsout
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 Posted: Wed Sep 28, 2016 11:54 am Post subject: [Non-DoD Source] Re: M14P running very rich at idle, stumb |
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I've attached a right side drawing of the carburetor. #3 is the knurled cover I mentioned.
Dennis
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From: A. Dennis Savarese <dsavarese0812(at)bellsouth.net>
To: "yak-list(at)matronics.com" <yak-list(at)matronics.com>
Sent: Wednesday, September 28, 2016 3:39 PM
Subject: Re: [Non-DoD Source] Re: M14P running very rich at idle, stumbl
As Mark pointed out, check the intake tubes on both ends and the intake drain kit. One of the bug-a-boos was the intake drain mechanism. They are very brittle and they have cracked before. I have seen them crack around the round collection cannister where the tubes empty into the Curtis drain valve.
Do you know how old the primer hose is under the cowling? They can easily deteriorate and crack over the years which would cause an air leak regardless of what position the primer pump is in. The hose connects to a firewall fitting just inside of the top cowling brace and runs over to the left side to a stand-off clamp mounted on the #2 intake tube. One way to check it for leaks is to raise the top cowl. With the engine off, pump the primer (Primer turned to the right) and have someone observe the hose for leaks while you're pumping the primer.
If you suspect an intake leak, remove both cowls. Start the engine. Then using a spray can of ether, spray around the intake tubes at both ends; spray around the intake drain kit and anywhere. Spray around the primer hose and fittings. If there is a leak, the engine RPM will increase when the ether is sprayed on the intake leak.
The idle speed adjustment is on the right (cockpit right) side of the carburetor under a knurled cover which is usually safety wired. If you have the carburetor heat ducts in place, you won't be able to easily see it because the heat duct on the right side will be covering the knurled cover. The knurled cover is on an angle pointing to the rear of the carburetor. You'll have to remove the heat duct to gain access to it. Under the knurled cover is the adjustment screw. It's a click adjusting screw. About 8 clicks from one stop to the other if I remember correctly. You'll need a long, thin, straight blade screwdriver to adjust the screw one click at a time without burning yourself on the exhaust stack. Adjust for peak RPM, then adjust the idle stop screw on the other side to bring the idle RPM to approximately 26% or around 750 RPM.
Dennis
From: ggtyler <ggtyler(at)gmail.com>
To: yak-list(at)matronics.com
Sent: Wednesday, September 28, 2016 3:04 PM
Subject: [Non-DoD Source] Re: M14P running very rich at idle, stumbl
--> Yak-List message posted by: "ggtyler" <ggtyler(at)gmail.com (ggtyler(at)gmail.com)>
Mark,
Yes, primer handle is in the upright position. The carb was reasonably recently fully rebuilt by M14P.com
The stumble is not excessive, but it's there and on the ground seems to run rich. The airplane was previously located in Indiana with a much colder environment than out here in California, so it may actually be jetted rich for the colder climate.
All your points are valid and I'll take a look at all of that, thank you for the suggestions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460801#460801 http://www.matronics.com/Navigator?Yak-List http://forums.mat - NEW MATRONICS LIST WIKI -
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