Carburetor questions
Racer
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
Is it the "divorced choke"? what is its purpose?
Let me elaborate a bit. The choke coil (bimetallic) is inside that rectangular housing on the intake manifold. That is why it is called divorced - it is not integral with the carb itself. The bimetallic moves that vertical rod in your photo.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
Let me elaborate a bit. The choke coil (bimetallic) is inside that rectangular housing on the intake manifold. That is why it is called divorced - it is not integral with the carb itself. The bimetallic moves that vertical rod in your photo.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
Let me elaborate a bit. The choke coil (bimetallic) is inside that rectangular housing on the intake manifold. That is why it is called divorced - it is not integral with the carb itself. The bimetallic moves that vertical rod in your photo.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
The linkage is attached to the choke rod which passes through the carb body into the well (the trangular opening you see) and operates the vertical rod that is attached to the choke plate. If that rod comes off inside the well, manually rotate the linkage so the arm inside the well it at the widest part of the well and hook it back on.
Hope this helps.
Last edited by Iron_dog; Nov 11, 2011 at 03:36 AM.
Racer
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
I don't remember bending which linkage arm is the proper way to adjust it. The choke plate should be fully closed when cold and not running. The engine vacuum to the 'choke pull-off' should crack the choke plate open when it starts. The bimetallic should gradually open the choke plate as it warms up.
I'm sure someone here has the correct numbers for a '74's adjustments.
I'm sure someone here has the correct numbers for a '74's adjustments.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
Guys, in this weekend I will start to clean the carburator.
One question: removing it from the motor, I've noticed there's a part of the linkage that has a hole with nothing attached. Is it OK or I'm missing something??? Please look at the picture attached.
One question: removing it from the motor, I've noticed there's a part of the linkage that has a hole with nothing attached. Is it OK or I'm missing something??? Please look at the picture attached.
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Racer
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
I don't know and I am unsure, but my best guess is there should be a rod for the "Unloader" function. If you flood the engine when warm, the unloader overcomes the choke operation (floor the gas pedal and hold it down, forces the choke plate to open, against the bimetallic's will) so as to let more air in and clear the flooded condition.
Your rebuild kit should have a diagram and instructions for adjusting the unloader.
Your best bet may be to email the photo to Cliff Ruggles and ask. If you never experience warm/hot re-start problems, you probably don't need it.
Best advice I can give is never touch the gas pedal on a warm start, let it crank 2 - 3 seconds and then lightly touch the gas.
BTW, if you flood the sucker, pop the hood and insert a LARGE-handled screwdriver to hold the choke plate open. Crank and it should clear right out.
Your rebuild kit should have a diagram and instructions for adjusting the unloader.
Your best bet may be to email the photo to Cliff Ruggles and ask. If you never experience warm/hot re-start problems, you probably don't need it.
Best advice I can give is never touch the gas pedal on a warm start, let it crank 2 - 3 seconds and then lightly touch the gas.
BTW, if you flood the sucker, pop the hood and insert a LARGE-handled screwdriver to hold the choke plate open. Crank and it should clear right out.
Last edited by Rich's'78; Nov 25, 2011 at 04:24 PM.
Racer
Joined: Sep 2010
Posts: 430
Likes: 0
From: SIGONELLA Sicily
Iron dog I am also in Italy I am stationed in Sicily. It is usaly a 360 rotation although it depends on who wrote it. If you are on or near the island I dont mind lending a hand depending on how far the travel is.
Andrew
Andrew
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
Andrew, thank you very much for your availability but I live in Milan, it's a bit too far from you! I'm looking for a vacuum gauge in order to do the stuff correctly and I've a doubt on the "turn" word...
Instructor
Joined: Nov 2011
Posts: 234
Likes: 24
From: Warsaw Ohio
Stan.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
Ok guys, I've reassembled and cleaned the carb, I've fixed divorced choke stuff, now the car runs even if cold BUT I still have the same problems when I accelerate... The car is not smooth at all!!!! What can I check? Is the accelerator pump, that I have replaced, the problem? Maybe the power piston???
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
When you had the carb apart, did you remove the power piston from its bore to clean in there?
Did you check to make sure that it was moving freely before you finished putting the carb back together?
If the power piston gets stuck in the down position, you will get a bad lean bog when you try to accelerate.
I used to see that happen quite a bit back when carbs were still common.
Also, if you didnt put the top gasket back on correctly, it can affect the operation of the piston as well.
Did you check to make sure that it was moving freely before you finished putting the carb back together?
If the power piston gets stuck in the down position, you will get a bad lean bog when you try to accelerate.
I used to see that happen quite a bit back when carbs were still common.
Also, if you didnt put the top gasket back on correctly, it can affect the operation of the piston as well.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
When you had the carb apart, did you remove the power piston from its bore to clean in there?
Did you check to make sure that it was moving freely before you finished putting the carb back together?
If the power piston gets stuck in the down position, you will get a bad lean bog when you try to accelerate.
I used to see that happen quite a bit back when carbs were still common.
Also, if you didnt put the top gasket back on correctly, it can affect the operation of the piston as well.
Did you check to make sure that it was moving freely before you finished putting the carb back together?
If the power piston gets stuck in the down position, you will get a bad lean bog when you try to accelerate.
I used to see that happen quite a bit back when carbs were still common.
Also, if you didnt put the top gasket back on correctly, it can affect the operation of the piston as well.
Thread Starter
Racer
Joined: Apr 2011
Posts: 471
Likes: 3
