'57 Cub not starting after repaint
Posted: Wed Jul 31, 2013 10:16 pm
Hey guys, did a 2/3 restoration on a 1957 white grill Cub, meaning only fixed the glaring issues but gave it a complete teardown and quality repaint. Anyway, got it all together and it won't start.
Work done relevant to issue to answer questions ahead of time:
New rings and rod bearings, didn't touch valves or have crank/cam or distributor out.
New copper core plug wires, not composite or whatever they are.
Rewired per operator's manual and double checked after issue started. New regulator.
Symptoms:
Turns over but won't start. Tries to catch and will even start a second but gas spits out of carb air intake tube (took it off to see what's going on). Spark tester shows spark to all plugs. Plenty of gas getting to it as it smells flooded. I looked at rotor and its in right. Fiddled with the timing back and fourth. Double and triple-checked plug wire locations per threads on this forum and my other Farmall Letter series tractors convinced that was the issues but they appear to be on right. I thought maybe a valve sticking but I went way beyond typical clean-up insuring no carbon was left in valve seats when cleaning up to avoid another tear=down.
I plan to check compression on each cylinder tomorrow and double check TDC with #1 cylinder and rotor location while at TDC. Should tell me if I have to tear down for a valve or head gasket seating or something. Otherwise what else am I missing? It ran fine before tear-down and repaint, I didn't touch the timing so that shouldn't be it, and rebuilt carb and had it running BEFORE tear-down so shouldn't be carb. I would think it has to be in the distributor, wires, or compression but even if a valve was sticking I've seen Cubs run on two cylinders with broken cranks and 3 would still be working if one valve happened to have carbon under it.
Work done relevant to issue to answer questions ahead of time:
New rings and rod bearings, didn't touch valves or have crank/cam or distributor out.
New copper core plug wires, not composite or whatever they are.
Rewired per operator's manual and double checked after issue started. New regulator.
Symptoms:
Turns over but won't start. Tries to catch and will even start a second but gas spits out of carb air intake tube (took it off to see what's going on). Spark tester shows spark to all plugs. Plenty of gas getting to it as it smells flooded. I looked at rotor and its in right. Fiddled with the timing back and fourth. Double and triple-checked plug wire locations per threads on this forum and my other Farmall Letter series tractors convinced that was the issues but they appear to be on right. I thought maybe a valve sticking but I went way beyond typical clean-up insuring no carbon was left in valve seats when cleaning up to avoid another tear=down.
I plan to check compression on each cylinder tomorrow and double check TDC with #1 cylinder and rotor location while at TDC. Should tell me if I have to tear down for a valve or head gasket seating or something. Otherwise what else am I missing? It ran fine before tear-down and repaint, I didn't touch the timing so that shouldn't be it, and rebuilt carb and had it running BEFORE tear-down so shouldn't be carb. I would think it has to be in the distributor, wires, or compression but even if a valve was sticking I've seen Cubs run on two cylinders with broken cranks and 3 would still be working if one valve happened to have carbon under it.