Cylinder damage
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My guess would be someone did not use the torque plates on the barrels when sizing/honing them. The torque plates cause the barrels to act like they are under assembled stress condition so, are a necessity to keep distortion @ a minimum
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Whatever the reason, the cylinder bore is way out of concentricity resulting in corrosion caused by humidity formed by condensation after the engine cooled down. Besides that the piston and/or piston ring size appears to be improperly matched resulting in excessive wear of the cylinder wall.
Armin.
Armin.
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2,058 Posts
I don't know if it is distorted, or just the pic because it is posed on that plastic covered foam on one side and the pushrods on the other side. If it had been on a flat hard surface, it might look better. But those distorted threads on the pushrods caught my eye.
Could just be the picture. Or my eyes.
Could just be the picture. Or my eyes.
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Rust? OK, what about the real issue of the scoring? These have been seized.
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The rust is old, the wasted cylinders appear fresh.
This must be an early pre-squirter model.
Low RPM idle and no oil on the pistons?
Or gas contaminated oil?
Or ring end gap too small?
I'd expect the pistons are junque as well.
I'd volunteer this unit for an oil tank cleaning as well.
This must be an early pre-squirter model.
Low RPM idle and no oil on the pistons?
Or gas contaminated oil?
Or ring end gap too small?
I'd expect the pistons are junque as well.
I'd volunteer this unit for an oil tank cleaning as well.
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774 Posts
😂It's fixable.View attachment 275291
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HEAT
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