VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1937-1945 My son's 1940 coupe

I have retired and sold all of my Chevys.To my amazement, my web site sign on still works!
My youngest son recently bought a 40 Coupe, a true barn find.
We got it running, but the carb definately needs help. I recall in the G&D there was a section of member services offered. Who should we send the carb to for rebuild?

Check the "Services Offered" section of the G&D that you mentioned and you will find several qualified dudes in there that will be glad to restore your carburetor.

I sure would do that, but since I haven't been a member for a couple of years I don't have a G&D to refer to. My son will be joining the VCCA but hasn't yet. I could look in Hemmings, but would like to give a club member the business. Thanks for your help.

1940 carb. Is the carb on the 1940 engine an original Carter W-1 420-S? If not, I have a good used one for sale.

dtm

I believe the carb is a 420S, however the tag is missing. The car is a master deluxe. We have replaced the points, condensor, cap, rotor,plugs, wires,and vacuum advance The problem is, the the car stumbles badly on acceleration.

That's a text book example of a bad accelerator pump. W-1s are brain dead easy to overhaul. Chevs of the 40s shows a rebuild kit.

Well, with the air cleaner off and the choke wide open, operating the bell crank the accelerator pump yields a nice squirt of fuel. My son did install a carb kit. The float level has been rechecked and is OK. Possibly some internal jetting was installed incorrectly. It seems that since the new vacuum advance was installed, the problem has become worse. The old VA unit didn't work at all. All of the parts my son ordered came from Chevs of the 40's.

Peerhaps would would help if you could explain "the carburetor needs help"......it may not even be the carburetor.

Did your son make sure that the connecting link between throttle plate/shaft was properly adjusted? It is critical for the metering rod and throttle plate be properly coordinated. There is a Carter tool to do that. Some rebuild kits also contain a measuring tool or give the distance the metering rod stud must be above main jet with the throttle plate fully closed.

Your VCCA number is still listed in your profile so from that I assumed that you were still a VCCA member. At any rate, are you sure it's the carburetor? Sounds like it could be electrical instead.

The new points are gapped at 20. There is a nice blue snap spark. It is timed at TDC with vacuum advance disconnected at the carb and plugged. With the vacuum advance reconnected you can see it move when the throttle is advanced. The old one didn't move a lick. We did the electrical tune up first and the car ran pretty good. We then noticed the VA wasn't working and bought a new one, and then the engine started to stumble off idle. Then my son rebuilt the carb with no improvement, possibly worse.

With the octane selector set at "0", the timing should be 5 degrees BTDC (steel ball on the flywheel), not TDC.

Back to my initial question, who would be a good person to sent the carburetor to get it rebuilt properly.

I sent you an email

I got it, thank you Gene!