Re: Rebuilding an AVS and wondering about mods.
[Re: ademon]
#578077
01/11/10 05:22 AM
01/11/10 05:22 AM
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Joined: Nov 2009
Posts: 520 New Zealand
nz383man
mopar
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mopar
Joined: Nov 2009
Posts: 520
New Zealand
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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?" What is the build date of your carb/car? I suspect it is quite an early '69 440 Auto, non air car. I wouldn't remove the plug. "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? Not unless you have to, test run the carb first & if it can be adjusted OK with the one screw, leave the plugs well alone. "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." I have no idea as all my carbs are drilled but be thankfull it is not drilled as it is a common place for a vacuum leak that is very hard to find, the bimetal strip can fail or the valve not seating properly can have you chasing your tail or adjusting something else to compensate. "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." Right on the money Later carbs with "SA" part number suffix have revised idle system (2 idle mixtute screws with limiter caps) "The FSM says the thermostatic valve is for A/C equipped cars. Are any of those carbs for non-A/C equipped engines?" Yes 3 are non A/C but all 3 are '70 or newer (see below) The information I have states that the hot idle compensator valve is only fitted to '68 & '69 cars with A/C but the '70 & '71 cars all have it fitted(A/C or not) This valve is a thermostatically operated air bleed, used to relieve an overrich condition at idle due to abnormal temperature.
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Re: Rebuilding an AVS and wondering about mods.
[Re: nz383man]
#578078
01/11/10 12:58 PM
01/11/10 12:58 PM
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Joined: Mar 2005
Posts: 1,547 Seattle, WA
375inStroke
OP
Special needs person
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OP
Special needs person
Joined: Mar 2005
Posts: 1,547
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?"
What is the build date of your carb/car? I suspect it is quite an early '69 440 Auto, non air car.
The car was built on September 4, 1968. I found a J8 carb, so September '68 build on the carb was the best I could do.
I wouldn't remove the plug.
I'm sure I'll leave that one alone.
"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?
Not unless you have to, test run the carb first & if it can be adjusted OK with the one screw, leave the plugs well alone.
The motor is stock except for the Edelbrock carb that I'm replacing with this, so I guess I'll leave the plugs and idle limiters alone since I'll still have some adjustment with the one on top.
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578082
01/11/10 07:42 PM
01/11/10 07:42 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
The "SA" carbs were replacement carbs and would have had the later style adjusters.
Ever see one with all 3?
Yep,69 440 4spd .
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578084
01/11/10 07:53 PM
01/11/10 07:53 PM
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Joined: Nov 2006
Posts: 3,407 S.E. Florida, USA
rrunner
master
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master
Joined: Nov 2006
Posts: 3,407
S.E. Florida, USA
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Quote:
John your 69's are typical, the early 68 AVS carbs had the single adjuster, most later 68's had two adjusters as your 69's do. I have also seen some 69's with the single adjuster, not really sure why they came both ways.
I always thought is was a auto/4spd thing Both my late 4426's have the single adjuster While my mid 68 4401 had two adjusters.
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Re: Rebuilding an AVS and wondering about mods.
[Re: 62maxwgn]
#578085
01/11/10 07:59 PM
01/11/10 07:59 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
Yep,69 440 4spd .
The best I can figure any of them that have all 3 started life with the single and someone added the lower 2 at a later date.
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578086
01/11/10 08:12 PM
01/11/10 08:12 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
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I always thought is was a auto/4spd thing Both my late 4426's have the single adjuster While my mid 68 4401 had two adjusters.
Yea, I'm still trying to figure out exactly what the deal was on the adjusters, I can only go by used originals I've seen and the VERY few surviver cars I've seen with untouched carbs. I've had a couple pretty knowledgable people suggest that maybe all of the 68/69 carbs originally came with single adjuster but were later modified to have the 2 lower adjusters, however I've seen a fair number of double adjuster carbs that looked very correct and original, so I feel pretty certain they came both ways.
Exhibit "A"
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578088
01/11/10 09:18 PM
01/11/10 09:18 PM
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Joined: Nov 2006
Posts: 3,407 S.E. Florida, USA
rrunner
master
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master
Joined: Nov 2006
Posts: 3,407
S.E. Florida, USA
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Scott, The 4426 that's on my RR had a pink paint stripe across the E8 4426 on the base when I bought the car. The car had been sitting for 20+ years and I needed to go throught the fuel system, when I soaked the carb I lost the stripe. Does the stripe have any meaning? Wish I had taken a pic before I soaked it, but didn't. Sorry for going off the topic here, but just wanted to know.
Last edited by rrunner; 01/11/10 09:21 PM.
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Re: Rebuilding an AVS and wondering about mods.
[Re: rrunner]
#578089
01/11/10 09:29 PM
01/11/10 09:29 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
Wish I had taken a pic before I soaked it, but didn't.
Me too, I've never seen one like that. Probably either an inspection mark or some kind of visiual aid to denote it's application.
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Re: Rebuilding an AVS and wondering about mods.
[Re: ScottSmith_Harms]
#578090
01/11/10 09:40 PM
01/11/10 09:40 PM
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Joined: Nov 2006
Posts: 3,407 S.E. Florida, USA
rrunner
master
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master
Joined: Nov 2006
Posts: 3,407
S.E. Florida, USA
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Quote:
Quote:
Wish I had taken a pic before I soaked it, but didn't.
Me too, I've never seen one like that. Probably either an inspection mark or some kind of visiual aid to denote it's application.
Visiual aid kinda makes sence as it was a very close match to the color of the tag.
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Re: Rebuilding an AVS and wondering about mods.
[Re: mark7171]
#578092
01/12/10 02:45 AM
01/12/10 02:45 AM
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Joined: Sep 2004
Posts: 6,906 IL, Aurora
ademon
master
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master
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IL, Aurora
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heres the 4426 carb i picked up off e-bay a few years ago, plugs still in it, never removed. I had the pri shafts bushed, then rebuilt it, stuck it on the 383 RR which is near stock and tried to adjust the vac/idle, would not respond to the top screw didn't idle bad, but went with the 69 avs that was on the car. I'd bet the dealers removed the plugs on a lot of these carbs to tune them in better back in the day.
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Re: Rebuilding an AVS and wondering about mods.
[Re: ademon]
#578093
01/12/10 03:38 AM
01/12/10 03:38 AM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
I'd bet the dealers removed the plugs on a lot of these carbs to tune them in better back in the day.
Quite possible
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Re: Rebuilding an AVS and wondering about mods.
[Re: JohnRR]
#578095
01/12/10 10:57 AM
01/12/10 10:57 AM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
Quote:
Quote:
The "SA" carbs were replacement carbs and would have had the later style adjusters.
Ever see one with all 3?
Yep,69 440 4spd .
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Re: Rebuilding an AVS and wondering about mods.
[Re: 62maxwgn]
#578096
01/12/10 05:32 PM
01/12/10 05:32 PM
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Joined: Jan 2003
Posts: 3,967 S.I. N.Y.
1MYTGTX
master
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master
Joined: Jan 2003
Posts: 3,967
S.I. N.Y.
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Ill be watching this thread as well....just picked up a 4640SA carb for my 69 440 with A/C. It has the 2 adjusting screws.
Got a vintage "Jiffy Kit" to rebuild it.
What does everyone do for the yellow cad plating on the rods? Eastwoods paint system or actually have them cad plated somewhere?
1MYTGTX
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