1929 super six
supersixer Posts: 39Member
Just purchased a 1929 Essex from a friend, car ran and drove but had a problem with vacuum tank but would run and drive when tank was filled manually. My friend sent the car to a local garage they tried installing a electric fuel pump but couldn’t get it to work right because pressure was too much. They found a working vacuum tank. Now the carb is getting fuel but will only idle but is no longer drivable, what do I need to check because I believe they did something to the engine while they had it for a month. I would like to know how to check the ignition timing also how to check if the timing chain jumped, the carb was checked and is clean and Venturi moves freely and carb body is as good at it was new and was working ok before shop touched it. Any help diagnosing the problem would be appreciated thanks. Tony, Ossipee, NH
Meanwhile, I don't know if you are a member of the H-E-T but, if not, you might want to consider joining. https://www.hetclub.org/
The New England Chapter is in your area, so -- whether you join the Club or not -- you might want to travel to their annual fall meet is on Oct. 4 in North Attleboro, Mass. Here's their webpage: http://newenglandhetclub.com/
It's always reassuring to have a network of hobbyists nearby, for quick technical help or t help find a much-needed part!
Please describe the operating conditions.
Ie. is accelerator pump working so engine will speed up?
Or just there is no power to maintain any speed above idle?
( which sounds like plugged gas passage to the high speed jet, or the jet it self. )
Also consider the Air Valve, will it move freely from resting at front wall to a verticle position with no binding? ( with spring removed )
The spring in the recess inside the large brass knob is supposed to be 1 1/2 inches long.
It is a calibrated "damper" in controling the Air Valve and is considered critical in the Marvel Repair Book.
Be careful, do not stretch the spring you have if it is only 1 1/16 inch long. You may have the wrong spring OR YOU MAY NOT HAVE A 1929 CARB.
What are the numbers on the side of the carb,,,,,,,,are they 10-140 ? if not what are they.
Ethanol fuel attacks rubber and the lacquer the factory coated the cork with. It can easily clog up the main jet. I replaced mine with one made from synthetic material. It’s about $50 for a chunk of plastic, but worth every dime! Also the air valve Venturi swelled up slightly on my marvel v, causing the air valve to stick. I carefully filed it back down just enough to allow for unrestricted movement.
Your fuel cap has no vent, the tank itself is vented at the the fuel pickup tube.
Dont rule out an electrical issue either. Coils and condensers can do funny things at 92 years old.
Be of good cheer that you have no need to connect to a computer, buy $500 worth of ignition coils or carry around both metric and SAE tools!
are you getting any fuel from the vacuum tank? (these things are particularly touchy, that is why I went back to an Electric fuel pump) A poor seal on the top gasket will cause you all sorts of misery. With only 5 inches of vacuum you may not have enough to pull the fuel out of the tank even if everything was operating properly.
He sells Buick parts and has repro. Marvel parts. The new floats are made of a new material instead of cork. I suspect that the Venturi tube in your manifold is burned out. I had to replace it on my 29. Check with Then & Now Automotive in Weymouth MA for a Venturi tube. Talk to Tom or Lisa.
I posted earlier that there is a square cover on top of the manifold ( 4 bolts?)
Remove it and look inside , I was able to see it burnt through the side.
I had a sleeve made and installed it from the top.
This was in the late 1970's , but my memory is still fairly good?