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Discussion Starter #1
Checked the compression on both cylinders and reads 180 psi (182 psi exactly on both).

Had lost coolant slowly through SOMEWHERE I can't find, and hot light had come on. Added coolant, and proceeded to continue mowing. Then, I had about a 2 second cloud of white smoke, then ran another minute or two and same cloud of white smoke, so I brought it in and shut it down. That's when I tore it down to the motor, and found only that two carb mounting nuts were loose, and tightened them. NO COOLANT leaking anywhere that I could find, and radiator was very nearly full. Thermostat is only 4 months old, and hoses are all good.

Any ideas or experience with this type of problem?

I was thinking that it appears the intake manifold casting has 2 passages, between the cylinder heads for intake, and second passage appears to be a coolant passage? Could it be an intake gasket leak, that causes a drip into the intake to cause the smoke?

HELP !

:flag_of_truce:
 

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Discussion Starter #2
Just an update on situation. I found the oil contaminated with coolant, and the overflow/relief tube from the water pump to the carb had the milky residue in it also, which is what caused the white smoke.

I have bags of parts and am taking it to the JD dealer for a new water pump.


Cheers.


:flag_of_truce:
 

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I'm going to suggest you have a bad head gasket, to have coolant in your oil. Also I have no idea what you could mean about any kind of tube that connects the carb to the water pump? I've never heard of such a thing. Are you sure that Isn't breather tube from the crankcase to the carb?
 
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