The Ford Barn

Jakksun · 09-23-2022, 07:40 AM

Newbie question. How much adjustment should there be for GAV? I can only get about 1/2 to 3/4 turn.

aermotor · 09-23-2022, 08:16 AM

Whatever sounds best and has most power going uphill, nothing unusual about 1/2 to 3/4

JoeCB · 09-23-2022, 08:54 AM

Quote:

Originally Posted by Jakksun

Newbie question. How much adjustment should there be for GAV? I can only get about 1/2 to 3/4 turn.

Are you saying that you can only turn the knob 1/2 to 3/4 turn and then it jams? Or that engine only responds to that small amount of turns?
If the former, something is wrong.
Joe B

katy · 09-23-2022, 10:12 AM

Is the rod going down to the GAV straight inline with the GAV at the carburetor? If the frame is sagged, which is quite common, there can be a misalignment where the rod connects to the carburetor, causing it to bind.

Jakksun · 09-23-2022, 11:01 AM

Quote:

Originally Posted by JoeCB

Are you saying that you can only turn the knob 1/2 to 3/4 turn and then it jams? Or that engine only responds to that small amount of turns?
If the former, something is wrong.
Joe B

It does not jam but that is all of the adjustment I have.

Brentwood Bob · 09-23-2022, 12:40 PM

Sponsored Links (Register now to hide all advertisements)

Zenith, or tillotson?

JoeCB · 09-23-2022, 01:12 PM

Something is not right. You should be able to turn and turn the knob freely, actually until you completely unscrew the GAV needle from the carb. Perhaps the shaft is not engaged with the flat on the needle. Pull back the steel sleeve and check to see if the shaft is engaged with the needle.
Joe B

nkaminar · 09-23-2022, 04:27 PM

Take the rod off to eliminate that from the equation. Lift up on the sleeve that holds the rod, then move the rod to the side and let the sleeve and spring, and any washers, fall off the rod. You can just push the rod up to get it out of the way. Then try to rotate the GVA with your fingers. If you still have the same problem, remove the GAV from the carburetor. Do not force the treads or you may damage them. If there is a loop of wire around the bottom of the GAV housing, remove it. Try turning the GAV with it out of the carburetor. Do not re install the wire loop.

JoeCB · 09-23-2022, 04:57 PM

Be forewarned, the GAV hex is an odd size, 13/32" and will normally require a six point deep socket to remove without destroying the brass fitting. A 10 mm metric socket will fit.
The spring wire loop is designed to keep some tension on the needle so that it can't lose it's setting with vibration. Sometime the tension needs to be adjusted if too tight.
Joe B

Jakksun · 09-26-2022, 10:35 AM

Quote:

Originally Posted by JoeCB

Something is not right. You should be able to turn and turn the knob freely, actually until you completely unscrew the GAV needle from the carb. Perhaps the shaft is not engaged with the flat on the needle. Pull back the steel sleeve and check to see if the shaft is engaged with the needle.
Joe B

Thank You! That is exactly what happened, now I'm wondering how?
TJ

JoeCB · 09-26-2022, 05:56 PM

Is the steel sleeve the original correct one? or has someone replaced it with an oversized tube? the original tube should just fit over the GAV needle shaft... no way the shaft and the needle can come disengaged.
Joe B

09-23-2022, 07:40 AM	#1
Jakksun Junior Member Join Date: Sep 2022 Posts: 3	Gav Newbie question. How much adjustment should there be for GAV? I can only get about 1/2 to 3/4 turn.

09-23-2022, 08:16 AM	#2
aermotor Senior Member Join Date: Mar 2015 Location: Greenville, SC Posts: 1,099	Re: Gav Whatever sounds best and has most power going uphill, nothing unusual about 1/2 to 3/4

09-23-2022, 10:12 AM	#4
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Re: Gav Is the rod going down to the GAV straight inline with the GAV at the carburetor? If the frame is sagged, which is quite common, there can be a misalignment where the rod connects to the carburetor, causing it to bind. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

09-23-2022, 12:40 PM	#6
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,245	Re: Gav Sponsored Links (Register now to hide all advertisements) Zenith, or tillotson?

09-23-2022, 01:12 PM	#7
JoeCB Senior Member Join Date: Nov 2018 Location: Farmington MI Posts: 284	Re: Gav Something is not right. You should be able to turn and turn the knob freely, actually until you completely unscrew the GAV needle from the carb. Perhaps the shaft is not engaged with the flat on the needle. Pull back the steel sleeve and check to see if the shaft is engaged with the needle. Joe B

09-23-2022, 04:27 PM	#8
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,897	Re: Gav Take the rod off to eliminate that from the equation. Lift up on the sleeve that holds the rod, then move the rod to the side and let the sleeve and spring, and any washers, fall off the rod. You can just push the rod up to get it out of the way. Then try to rotate the GVA with your fingers. If you still have the same problem, remove the GAV from the carburetor. Do not force the treads or you may damage them. If there is a loop of wire around the bottom of the GAV housing, remove it. Try turning the GAV with it out of the carburetor. Do not re install the wire loop. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 09-23-2022 at 10:03 PM.

09-23-2022, 04:57 PM	#9
JoeCB Senior Member Join Date: Nov 2018 Location: Farmington MI Posts: 284	Re: Gav Be forewarned, the GAV hex is an odd size, 13/32" and will normally require a six point deep socket to remove without destroying the brass fitting. A 10 mm metric socket will fit. The spring wire loop is designed to keep some tension on the needle so that it can't lose it's setting with vibration. Sometime the tension needs to be adjusted if too tight. Joe B

09-26-2022, 05:56 PM	#11
JoeCB Senior Member Join Date: Nov 2018 Location: Farmington MI Posts: 284	Re: Gav Is the steel sleeve the original correct one? or has someone replaced it with an oversized tube? the original tube should just fit over the GAV needle shaft... no way the shaft and the needle can come disengaged. Joe B