The tractor ran fine but smoked a little, especially on an idle. Took the head off so we could measure the cylinders to see if they had been bored out. They measured about .003 to .004 over 2.625 so they haven't been bored. They were not egg shaped at all. 2 of the pistons were clean and the other 2 were kind of charred and had some sludge build up. Just bought the tractor about a year ago, so we have no idea how old the spark plugs are. Noticed some oil on the cylinder walls, but no scoring. Thinking about putting in a new set of standard rings and lapping the valves. Is this the thing to do? Or should it be bored out oversize? Its not going to do alot of real work, just kind of toy.
- Thread starter BOBM25
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CraigChristian
Member
Bob: In retrospect, I'd have run a few cans of SeaFoam through it first - maybe rebuilt the carb and done a complete tune-up inc. wires, points and rotor before taking the head off!!! What was the compression ??? Be sure to use thread sealer on those bolts (preferably new bolts) during reassembly as several of them go directly into the water jacket. Craig
Janicholson
Well-known Member
.004" is doable. I would be sure to remove the ridge (ridge reamer) then hone with a bead style brush hone 340 grit, to break the glaze. Jim
Anonymous-0
Well-known Member
What do you mean by smoked a little? Does it continue to smoke after it is fully warmed up? If you have black smoke at idle, it could mean too much fuel. Smoke from internal worn parts would be more of a blue or gray. White smoke could be moisture in the cylinder from condensation or an internal cooling system leak.
If it is a numbered series Cub, fumes coming out of the dipstick breather is normal since the engine has no other escape for the crankcase fumes. The early Farmalls and Cubs had a line from the crankcase to the Air Cleaner to suck the fumes from the crankcase and burned through the engine.
If it doesn't consume oil and has good compression, I would leave it alone. Do what you can from the outside. Tune it up and adjust the valves. I would recommend Autolite 3116 spark plugs. If you want a worry free ignition, consider installing an electronic ignition.
These are tough little engines. Many of them have been overloaded, overheated and neglected for many and still run.
If it is a numbered series Cub, fumes coming out of the dipstick breather is normal since the engine has no other escape for the crankcase fumes. The early Farmalls and Cubs had a line from the crankcase to the Air Cleaner to suck the fumes from the crankcase and burned through the engine.
If it doesn't consume oil and has good compression, I would leave it alone. Do what you can from the outside. Tune it up and adjust the valves. I would recommend Autolite 3116 spark plugs. If you want a worry free ignition, consider installing an electronic ignition.
These are tough little engines. Many of them have been overloaded, overheated and neglected for many and still run.
John M
Well-known Member
- Location
- Nunyafn business
If 2 looked fine, and 2 didnt, Id just go ahead and rebuild it since you already have it tore down this far! How did you determine they werent egg-shaped?
Brian Schmidt
Member
Bob, I think you are on the right path to re-ring it. I wouldn't bore it since it don't need it.
How clean were the two clean pistons ? If there was no carbon on them you might have a water leak into those cylinders.
As long as you have the rods out, you may well check the bearings. And putting in rings without at least lapping the valves could lead to trouble there. By the time you are that far, you'll be on the slippery slope to rebuilding the whole motor.
Greg
As long as you have the rods out, you may well check the bearings. And putting in rings without at least lapping the valves could lead to trouble there. By the time you are that far, you'll be on the slippery slope to rebuilding the whole motor.
Greg
We did'nt take the pistons out yet. Just cranked the engine over by hand to measure the cylinders. Never thought about the water leak issue. I think we'll hone the cylinders, lap the valves, new head gasket, new plugs and wires and look into the carb. Holds good oil pressure so I feel that the bottom end is probably ok.
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