Re: Carter Themoquad adjustment
[Re: LL340Rag]
#646837
03/21/10 01:11 PM
03/21/10 01:11 PM
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Joined: Jan 2003
Posts: 3,704 MICHIGAN
DynoDave
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master
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MICHIGAN
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You might want to thumb through this. The adjustments need to be done in a specific order. Imperial Club Any idea on jets and rods? Are they stock? Is that an original 340 or small block carb? Do you know if the carb. rebuilder replaced the o-rings in the bowl area? They can leak and lead to a rich condition (see p.11).
Last edited by DynoDave; 03/21/10 01:14 PM.
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Re: Carter Themoquad adjustment
[Re: IcorkSOAK]
#646843
03/21/10 03:35 PM
03/21/10 03:35 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
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I'll second checking the resealing of the jetwells. Also check the float height. I has to be checked with the gasket in place. Measure from the gasket surface.
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Carter Themoquad adjustment
[Re: IcorkSOAK]
#646846
03/21/10 04:23 PM
03/21/10 04:23 PM
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Joined: Sep 2004
Posts: 6,906 IL, Aurora
ademon
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Quote:
What is all this JET WELL chat ? ... is this what you guys have seen lots ? ... I have rebuilt more than my share of TQ's .. but I have only seen that prob once.
Which year/model carbs are prone to this issue ?
i think al the 72 and later ones, i have only rebuilt one and it leaked, its the two small bumpes on the bottom of the bowl the jets screw into the well area. i just checked it by adding water to the bowl when apart and looking for a drip or moisture around the factory sealer.
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Re: Carter Themoquad adjustment
[Re: LL340Rag]
#646847
03/21/10 05:25 PM
03/21/10 05:25 PM
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Joined: Jan 2003
Posts: 16,894 Between Houston & Galveston TX
SattyNoCar
Smarter than no class Flappergass by a mile
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Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,894
Between Houston & Galveston TX
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I've rebuilt a number of TQ's, and all the ones I've done, you could see the metering rod adjustment screw when the metering rods were up. I can't see yours in the pic (screwed in too far would make it rich). Not conclusive by a long shot, but, one of the first things I'd check. I've had the leaking wells too, but, it was always on a TQ that was on a car with Lean Burn.
John
The dream is dead, long live the dream.......😥
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Re: Carter Themoquad adjustment
[Re: LL340Rag]
#646850
03/21/10 09:54 PM
03/21/10 09:54 PM
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Joined: Jan 2003
Posts: 5,270 Missouri
MY340
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Missouri
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Bottom your metering rod tree by turning screw CCW and then turn the screw 1 turn CW just as you see the tree start to raise for stock setting.
1.5 turns out on the idle mixture screws is a good starting point.
1970 FE5 Duster 360/904/3.91's SOLD
1973 TB3 SpaceDuster 340/4spd/4.10's SOLD
Moparless for now but when the opportunity is right I'll have another one.
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Re: Carter Themoquad adjustment
[Re: IcorkSOAK]
#646851
03/22/10 06:52 AM
03/22/10 06:52 AM
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Joined: Jan 2003
Posts: 4,507 Connecticut
LL340Rag
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Quote:
That is only ONE screw ...and the height-spec is not "standard" .. it can vary. Do you have a pic of yours?
And is your rich-situation through all ranges of operation ?
Where is the one screw on the carb supposed to be. The small one in the center triangle? I know it is not standard. I just need to play around with it. It is rich through everything. It runs nice but is massively rich to the point of having to change my clothes after 30 seconds of running.
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Re: Carter Themoquad adjustment
[Re: LL340Rag]
#646852
03/22/10 11:03 AM
03/22/10 11:03 AM
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Joined: Apr 2007
Posts: 2,936 Calgary, Alberta Canada
a12rag
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Hmmmm, is the float level too high ?? Yes, the rod adjustment screw is the one in the "triangle" as you pointed out. When the car is running, vacuum pulls the rods down (with the stepped rods in the jets, this effectively changes the size of the openings (i.e. lean or rich). . . the screw allows adjustment of this . . . Rather than playing with it too much, is there a shop nearby that has a mechanic that knows carbs (not many of the breed left !!!) and would be able to hook it up to an exhaust analyzer ? Then you know for sure that you are adjusting things correctly. Is the choke on ? Oh sooo many questions . . . check out the attached link : http://carburetor.ca/pdf_manuals/Carter/1972TQmanual.pdfTQ's are great carbs, but really need to be adjusted in sequence . . . happy tuning. . . Cheers Mark
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Re: Carter Themoquad adjustment
[Re: a12rag]
#646853
03/22/10 11:38 AM
03/22/10 11:38 AM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
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The metering rod spring hanger (the long arm the rods go on) has a sngle piston in the center. The screw head you see is the top of a long rod that goes downt o the bottom of the baseplate. The lever in the baseplate works like apower valve t force the rods out of the jet, richening the full hrottle mixture to the max the jet and rod will flow whetehr there is vacuum or not. At all other times and throttle openings, the rod hanger is controlled by engine vacuum operating against the step up spring, which is under the piston on the rod hanger. If you engine is not stock, my impression is the factory spring is incorrect and pushing the rods to the rich end of the spectrum all the time. You can adjust that center screw all you want, if the spring isn't properly matched to the combo, you'll be either rich or lean all the time except full throttle.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Carter Themoquad adjustment
[Re: IcorkSOAK]
#646854
03/22/10 12:32 PM
03/22/10 12:32 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
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I Live Here
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Not2farfromNashville, TN
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Quote:
What is all this JET WELL chat ? ... is this what you guys have seen lots ? ... I have rebuilt more than my share of TQ's .. but I have only seen that prob once.
Which year/model carbs are prone to this issue ?
Yep I just pop the wells off on any rebuild, restick them. I have pulled some apart that the wells completely drop off. I redo them with JBQuick or regular JB if I'm not in a hurry to put it back into service.
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