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Joe K · 04-01-2020, 07:51 PM

I think what has happened is someone set the GAV overly tight, the needle has now "galled" to its seat, and preventing relative motion.

The GAV needle passes through the housing part you see. With the driver off and removed you'll see the half circle of the GAV Needle inside the housing.

Using the box wrench (preferably 6 pt. You may want a choice of No. 10 metric and 3/8 - one or the other will fit) if you remove the housing, you get both housing AND the needle.

With the two removed you might be able to use a wrench or vise to hold the housing and turn the needle with the driver. You may see the "gall" on the pointy end - this can be cleaned up with emery cloth.

Some Zenith have a brass "seat" for the needle to work against. Others have a cast iron seat. Both are prone to this sort of galling. Removing the entire GAV assembly gets you past this post haste.

Joe in NH
Who only yesterday had the same issue on the identical part - and ended up "crushing" the thin portion of the GAV housing with a pair of vise grips simply to remove it. In my case a torch helped to a successful removal. (Brass and cast iron ALWAYS are easier to remove after heating.) The parts are readily available but you may need to do some "fitment" of the needle to the housing to get the proper degree of resistance to turning.

04-01-2020, 07:51 PM	#4
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Carburator Update I think what has happened is someone set the GAV overly tight, the needle has now "galled" to its seat, and preventing relative motion. The GAV needle passes through the housing part you see. With the driver off and removed you'll see the half circle of the GAV Needle inside the housing. Using the box wrench (preferably 6 pt. You may want a choice of No. 10 metric and 3/8 - one or the other will fit) if you remove the housing, you get both housing AND the needle. With the two removed you might be able to use a wrench or vise to hold the housing and turn the needle with the driver. You may see the "gall" on the pointy end - this can be cleaned up with emery cloth. Some Zenith have a brass "seat" for the needle to work against. Others have a cast iron seat. Both are prone to this sort of galling. Removing the entire GAV assembly gets you past this post haste. Joe in NH Who only yesterday had the same issue on the identical part - and ended up "crushing" the thin portion of the GAV housing with a pair of vise grips simply to remove it. In my case a torch helped to a successful removal. (Brass and cast iron ALWAYS are easier to remove after heating.) The parts are readily available but you may need to do some "fitment" of the needle to the housing to get the proper degree of resistance to turning. __________________ Shudda kept the horse.