I've a bit of a problem......my 36 Terraplane 61 runs like a champ (orig. 212).......but the choke has to be at half mast even when warmed up! HELP!! The gaskets have all been replaced, including intake manifold , carb base, etc. Also, the carb was pro rebuilt - altho I didn't do it, so can't say the steps taken/parts replaced/adjustments made. Also, all plugs, fittings etc. on the manifold are tight/good. I have not tried it with the air cleaner on, but I would not think that would change the outcome. Fuel pump is putting out adequate pressure (I tested it). Your advice and experience would sure be appreciated!
After 40 years I'm still an amateur, but....doesn't this mean that there may be a vacuum leak somewhere? This is diluting the fuel mixture and thus you have to run the engine with the choke partially shut in order to increase fuel-to-air?
Is the windshield wiper tubing connected at both ends and in good condition . . . no cracks, etc.? (Once during some engine work I forgot to reconnect the wiper hose to the manifold fitting. Drove me nuts going through all the not-so-obvious possible causes).
Take vacuum readings, cold, warm, hot, choke closed, 1/2 way, and open. Putting the air cleaner will enrich the mixture slightly. It sounds like you have a leak somewhere or the carb is set too lean..
Badly worn carb shaft bushings (vacuum leak) can cause this, as well as incorrect or dirty jets.
Rob
Thanks for all the great ideas!! I will do the vacuum checks as well as check all connections again. Also, I will open the carb and check it carefully....just to make sure no dirt, loose shafts, improper adjustments.
If it runs fine with the choke half out then it is not a fuel supply problem. My guess would be blocked main jet, or metering pin incorrectly installed. This would be a Carter W1 originally. I had a similar problem years ago, and the ear of the actuator was on the wrong side.
Geoff
Thank you for the additional ideas! My next step is to pull the carb and carefully check it over - first for sediment, etc. It's a 331S - orig. carb. I have rebuilt other Carters but not this this type. I have an early Motors manual as well as the Hudson mechanical procedures manual....is there a more detailed reference that I should try to obtain?
That stye carb was used from 1932 to 1936, both 6 and 8's. It takes special tools to remove all the jets, which I have, as using screw drivers jams the threads and then the carb is JUNK. Some jets are at least 1&1/2 inches inside the carb BODY, holes smaller than 1/8 inch. Walt.
I had a similar problem with a Stude pickup with the Champion "6"; it turned out to be a "booger" in one of the jets. A simple clean out and then it ran great.
Thanks for the heads-up Walt...... Do you have the tools available for purchase?
Jared,
How is the idling? Does it idle with the choke pushed in? Does it idle on all six cylinders?
Per
No, it stalls right out when not 1/2 choked.....but with the 1/2 choke it idles very smoothly....
Seems to me the low speed jet is blocked.
Jared,
I agree with Geoff.
Recently I found that the idling jet on a Hudson Jet carburetor had gotten totally plugged. The engine only ran until the automatic choke opened. It then abruptly stopped. It would only keep running when I held the choke partially closed.
It is good that it idles very smoothly! Dealing with the carburetor should be all that it needs.
Per
Leave a reply
