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engine won't run

B

bob featherstone

Member
have been a regular reader here for a bit & looks like there are some pretty sharp mechanics here so thought i"d give this a shot
built a tractor 20 years ago ( have since up-graded to a 49 8n to actually use ) the home made one still kicks around as i can"t part with it for about 2 years the only way i can make it run & keep it running is to put duct tape over the top of the carb choking off 90% of the intake air motor is 2000cc ford with 2 barrel carb have checked every where for vaccum leaks, good supply of gas, etc
have not removed carb & tore apart in a few years as i worry about lack of parts to rebuild
i did have the head off a few years ago to do the valves but it ran fine after so i don"t think a timing belt or dist problem is it
anyone got any ideas it would be greatly appreciated once in awhile when i got nothin goin on i like to fire it up & see if i can solve the problem
bob
 
Hold your hand over the throat of the carburetor and see if there's good suction on your hand. You need good intake manifold vacuum to pull that fuel into the engine. If you don't have good suction there's a problem with your manifold vacuum. The mainifold may need to be tightened or your valves aren't seating, rings and cylinders may be worn. Do a compression check and see what your readings are. How long has it been since that timing belt was replaced? You could bring No1 piston to TDC on the compression stroke. Look to see if the timing mark is aligned with the pointer and then pull the distributor cap and see where the rotor is pointing. Should be at the No1 plug tower. If its off it may have jumped time. I have pic of that engine on installing a new belt if you need it. Hal
 
i'd run a compression test first. pull all the plugs, throttle wide open, ignition off. write em all down they should be at least 90 psi per cylinder, and no more than 10 percent variation. then put a couple squirts of motor oil in each cylinder, roll the motor over and re-run the test. if the compression comes way up, prolly worn or sticky rings. if not could be valves if the compression is very low. if that all checks out, look to the carburetor starving for fuel. does it have good vaccuum at the carb intake if you hold your hand over it while cranking?
 
Wait a minute here. Where is your gas tank located? Is it below the carburator? I'm assuming this engine has a fuel pump. Sounds like it isn't working to push the gas up from the tank to the carb and you're having to use the duct tape to use the carb to suck the gas up to it. Try using an old lawn mower tank and a piece of hose. Hook the hose to the carb and hold the tank above it and see what happens.
 
Make sure that your spark is good, FAT, AND BLUISH-WHITE the color of lightning. A weak spark needs a richer mixture.

Sounds like you are effectively running it with a choke on by taping theinlet over. Either your mixture is set too lean on the carb or there is an air leak downstream of the carb metering section that's leaning the carb. it could be a leaky gasket on the cylinder head to intake manifold, cracked or rusted intake manifold or a leaky carb to intake manifold or worn throttle shaft.
 
Your idea is flawed. I don't think you can suck it out of a tank that is below the carb. It will only suck the bowl empty.
 
had a problem like that tractor would run but had to keep it choked all the time carb was clean pull the fuel line off flow seemed good but didnt let it run long enough finaly found a small cacoon of a moth in the line it would pull down to the 90 and shut the fuel allmost off finaly found it when i thought i would change the bowl assmbly thinking maybe the screen on the stan pipe was the problem the screan was missing
 
sounds like a vacuum leak...fire it up and spray some carb cleaner around the base of the carb and intake manifold- the idle will go up when you find the spot.
Vaccum leak will lean it out, requiring you to choke it to get it to run.
 
That's how we could tell if the mechanical fuel pump was defective. If you have good manifold vacuum and by holding your hand over the throat
of the carburetor you can actually keep the engine running until you remove your hand. It will pull gas from the tank. Hal
 
moved the gas tank to above engine a few years ago getting good supply of gas to carb
will get a compression guage & start there & see what the cylinders read
bob
 
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