MrMarty51
Full Access Member
- Joined
- Oct 25, 2012
- Posts
- 7,768
- Reaction score
- 9,956
- Location
- Eastern Montana
- First Name
- Martin
- Truck Year
- 1978
- Truck Model
- K20
- Engine Size
- 400
Not a Square Body. Sorry.
This is on My step sons 1970 Chevrolet C20 with a TH400 and a 350 SBC.
I rebuilt the carb and it is functioning very nicely.
The portion that fails to function is the automatic choke.
The choke mechanism is one just like this one in the picture.
The problem I believe lies in the exhaust cross over through the intake manifold.
I dont believ that the choke stove is getting warm enough for the bimetal spring to fully function. Thinking that the cross over within the intake manifold might be plugged I got out the IR thermometer and the temp on the choke bimetal mechanism surface of the intake manifold was only 115 degrees.
I removed the bimetal mechanism and that mounting surface was barely over skin temperature which would be slightly over 100 degrees.
Can someone do a temperature check on the choke stove surface of their intake manifold and let Me know what it is, or, what it should be if You already know.
I dread the thought of having the step son buy an intake manifold gasket set, go through the pains of draining the coolant and popping off that intake manifold to only find that it is not plugged.
We will be starting on this sometime fairly early AM so the sooner a reply the better, and, it will be very much appreciated.
Thank You all in advance.
This is on My step sons 1970 Chevrolet C20 with a TH400 and a 350 SBC.
I rebuilt the carb and it is functioning very nicely.
The portion that fails to function is the automatic choke.
The choke mechanism is one just like this one in the picture.
You must be registered for see images attach
The problem I believe lies in the exhaust cross over through the intake manifold.
I dont believ that the choke stove is getting warm enough for the bimetal spring to fully function. Thinking that the cross over within the intake manifold might be plugged I got out the IR thermometer and the temp on the choke bimetal mechanism surface of the intake manifold was only 115 degrees.
I removed the bimetal mechanism and that mounting surface was barely over skin temperature which would be slightly over 100 degrees.
Can someone do a temperature check on the choke stove surface of their intake manifold and let Me know what it is, or, what it should be if You already know.
I dread the thought of having the step son buy an intake manifold gasket set, go through the pains of draining the coolant and popping off that intake manifold to only find that it is not plugged.
We will be starting on this sometime fairly early AM so the sooner a reply the better, and, it will be very much appreciated.
Thank You all in advance.