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Joined: Feb 2007
Posts: 188
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2007
Posts: 188 |
Just got through putting a rebuilt carb from Chevys of the 40's on my 54 powerglide. It starts fine and seems to take the fuel well except when you press down hard on the accelerator, then it spits back through the carb and sometimes even die. It doesn't do this unless you give it a lot of gas all of a sudden. The carb that was on it did the same thing. It was rebuilt and still the problem existed. After sinking the money into another carb, I still have a problem. Anyone got any ideas or suggestions? No one around here works on the old six cylinder anymore and all I get for advice are guesses. Could this be an advance problem with the distributor?
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Read carefully my advice. With the main coil wire from the coil to the distributor disconnected. With a light source (not a flame) shining down the throat of the carburetor, make a quick movement with the throttle. If everything is functional, you should see a squirt of raw gas into the throat of the carburetor. This tells us if the accelerator pump is working. If you see the gas, your problem may be elsewhere. If you don't see the gas the carburetor must be disassembled and the accelerator pump checked for a problem, or the passageway may be plugged. If so, then return to the purchase source.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Feb 2007
Posts: 570
Oil Can Mechanic
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Oil Can Mechanic
Joined: Feb 2007
Posts: 570 |
I don't know about the advance part of it, but I would definatly check the distributer shaft play. If there is excessive play, it will cause your points to "float" and thus the miss/backfire. I would also check your points for proper gap, and sparkplugs for proper heat range, look for blisters.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Bud, You know that it takes those engines about 20 minutes to warm up.May be your expecting too much.Is the heat riser free?Try advancing the timing a little more.
If you don't see gas squirting in forget the above.
Gene Schneider
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Joined: Dec 2001
Posts: 176
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2001
Posts: 176 |
Check the base of the carb at the intake manifold. There should not be a gasket at this point. The insulator block is all that goes at that location. Using a gasket cuts off the vaccuum to the distributor advance and thus causing the problem that you indicate. I have seen this on three 53, 54 chevys in the last couple of months.
Walt D
1934 Mstr 4 dr/sidemnts
1937 1/2 ton P/U
1953 Bel Air HT
1946 Aeronca 7-AC Champ
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Will also cut of the vacuum to the vacuum operated power piston in the carburetor.This will place the piston in the full power or rich position at all times.The little hole under the base of the carburetor must line up with a notch in the insulator.
Gene Schneider
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