Q-Jet Secondary Lockout Not Disengaging

joesregalproject

joesregalproject

Royal Smart Person
Nov 4, 2012
2,486
1,079
113
Pittsburgh, PA
#1
I'm putting my 800 CFM M4MC Q-Jet back together with a rebuild kit and the only thing I can't seem to figure out is why the secondary lockout lever isn't disengaging. No matter what position the choke is in, the secondary throttle plates are always in the locked shut position. Is something missing from the other end of this secondary lockout lever? Here's a picture-

img_20181119_173407692-2004x2672-jpg.99824
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,754
4,368
113
Kitchener, Ontario
#2
there is something wrong cause the lever can't swing away from the lock out pin on your carburetor.

img_20181119_173407692-2004x2672-jpg.99826
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,754
4,368
113
Kitchener, Ontario
#3
I just put a body onto a base to show you what it should look like


here is the lever resting on the stop with the choke off, it shows the opening between the lever and pin

carb1-jpg.99827


and here is the choke on and you'll see the gap between the stop and lever

carb3-jpg.99828
 
joesregalproject

joesregalproject

Royal Smart Person
Nov 4, 2012
2,486
1,079
113
Pittsburgh, PA
#5
I'll take a closer look at it after dinner.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,754
4,368
113
Kitchener, Ontario
#6
I remove that lever on my carbs so it never interferes, some guys cut the pin. It is just there to prevent the secondaries from opening when the car is cold but I don't too many of us who would floor the car with the choke still on.
 
joesregalproject

joesregalproject

Royal Smart Person
Nov 4, 2012
2,486
1,079
113
Pittsburgh, PA
#7
Ok, I still can't see how the hell this thing is supposed to be set up. Here's a video of me working the throttle, you can see the secondaries binding.

 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,754
4,368
113
Kitchener, Ontario
#8
your choke isn't coming off, the lever is held off when the choke is off by the pin that comes up with the choke rotating off..

carb3-jpg.99840


carb1-jpg.99841
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,754
4,368
113
Kitchener, Ontario
#10
I removed the choke housing and took some pictures from the backside which may help

choke off the lever is held back from the pin
carb6-jpg.99844


choke is on, lever is balanced to swing when released to lock the pin
carb7-jpg.99845


lever swings to lock the pin with the way it is balanced
carb6-jpg.99844


the lever balanced to swing to lock pin

carb8-jpg.99847
 
Last edited:

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