Rebuilding an AVS and wondering about mods.
#578057
01/09/10 11:37 PM
01/09/10 11:37 PM
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Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
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Special needs person
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Seattle, WA
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I have a '69 AVS, 4618S, and am wondering about a few things. This plug is supposed to cover an off idle adjustment screw, according to the FSM. Should I gain access to it for cleaning and adjustment? There is a spring inside that presses against a ball bearing, and on the top, it opens to the atmosphere. It allows extra air to enter after the idle mixture screw, which itself just adjusts how much the idle fuel is diluted. This is where the air comes from that goes through the idle mixture screw, and into the idle circuit. This is where the idle limiter screws, as the FSM calls them, are located. They are covered by a plug and staked in. Should I gain access to them for the rebuild also? Finally, there is this thermostatic air bleed, which I thought was only on A/C equipped cars, like the 4640S carb. It looks like it opens to a blind hole. I don't see any holes inside. Wonder why they wouldn't eliminate it on carbs that aren't drilled for it. Why are the Edelbrock mixture screws up on the diagonal part, and the Carter has the same plugs next to the PCV port, and their mixture screws are below those?
Last edited by 375inStroke; 01/10/10 09:46 PM.
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Re: Rebuilding an AVS and wondering about mods.
[Re: JohnRR]
#578060
01/10/10 02:05 PM
01/10/10 02:05 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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maybe, but not necessarily. Can't quite see. Those were emissions carbs, and on a virgin carb, there was a lead plug over the mixture screws. The screw head was recessed deep into the carb below the plug. An early attempt to prevent owner tampering.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Rebuilding an AVS and wondering about mods.
[Re: JohnRR]
#578062
01/10/10 05:51 PM
01/10/10 05:51 PM
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Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
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Quote:
On your bottom photo where the tip pf your pencil is pointing , those WERE the idle mixture screws , they are broken off because the steel screw is frozen in the cast alum body .
They are not broken off. Those are lead plugs. I can scratch it with my finger nail, and it matches the pics in the FSM. I couldn't find it because I was looking in the AVS section only, but at the very front of the chapter, it says to remove the plugs to adjust the screws, so that's what I will do. Not sure yet about the off idle adjuster, though.
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Re: Rebuilding an AVS and wondering about mods.
[Re: 375inStroke]
#578065
01/10/10 07:05 PM
01/10/10 07:05 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
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Not2farfromNashville, TN
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This is an interesting thread. Thank you. I love my Carters!
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578070
01/11/10 12:25 AM
01/11/10 12:25 AM
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Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
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I think the 4618S had the single air bleed screw up top, and the 4618SA eliminated it, and added conventional adjusting screws where the idle limiter screws were in the earlier series. Perhaps it didn't accomplish it's goal, like the carbs were too lean, and getting lean misfires at idle, thus defeating the purpose of the leaner, reduced adjustability design.
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