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farmall cub no start

J

jeep258goat

Member

OK, tractor show this week and need some help on 50ish cub. Has a distributor cab, 6 volt, factory restore. Put the cub back together and had an overheat problem. took apart the to flush cooling system and put back together and now wont start. seem to have good compression as it blows your thumb off the spark plug out let and i laid the plug on the manifold while cranking and saw the #1 plug has fire. Spins well just does seem to catch and fire up. Can someone walk me through how to time it again. I got the manual but not sure i am reading right. My big question is "a sure way to know I am at TDC on the first cylinder nearest the radiator? then what side of the rotor button should be facing the 2 oclock,,,is it the short side or the side that has the gap with the bar extend out from the plastic area?
short deadline so all help is appreciatted!
 
Remove the #1 spark plug and with your thumb over the hole, rotate the pulley till you feel the pressure (compression) building up and continue to rotate the pulley till the you reach the second timing mark. You will now have the #1 cylinder TDC on the compression stroke. With this set, look over to the distributor rotor button, it should be pointing to the #1 tower, or about 1 or 2 o'clock.
 
 
There should be a metal strip that goes out to one side of the rotor and that end comes in contact with the buttons inside the cap. That's the end of the rotor that needs to be at 2 o'clock when you're at TDC on the compression stroke. Pour one teaspoon of gas in one of the plug holes and after replacing the sparkplug see if the engine fires like it may start. If the engine runs or makes an attempt to run you're probably not getting gas into the engine.

Hold your hand over the throat of the carburetor and see there's good suction when a helper makes an attempt to start the engine. Low suction means low intake manifold vacuum. Hal
 
thanks, my problem is that the markings on the pulley are not clear as it seems some pitting is around alot of the pulley wheel. i think this is why my tdc is not probably perfect. i am just letting that pressure blow against my thumb assuming when pressure is over i am at tdc.
 
If the timing marks are not visible, with the #1 plug removed and after you have felt the pressure with your thumb, insert a screwdriver in the hole and let it rest on top of the piston. As you turn the pulley, the screwdriver will rise to the point of TDC and then start to drop. At the peak of the movement is where you would then check to make sure that the rotor is pointing at the #1 tower.

Edit: if you have low manifold vacuum, then you either have stuck valves (extreme case) or leaking manifold gaskets
 
You may have a leaking manifold gasket, poor compression, leaky valves and worn cylinders. They're all related. Hal
PS: Do a compression check to see what the readings are.
 
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