Mower blows white smoke

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  #1  
Old 08-01-09, 06:36 PM
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Angry Mower blows white smoke

OK, received 7yr old Snapper mower with fresh gas and not so fresh oil. BUT mowed my lawn til it ran out of gas (about 3 separate runs). Had at least 3yr old gas in a can in the garage and used it. Meanwhile bought and used 30W oil, possibly adding too much.

The first time the smoke appeared was while mowing, I leaned over to pluck a weed and let go of the grip causing the motor to shut off. BUT I noticed this and squeezed grip to continue running it. Two seconds later, White Smoke and dead.

Let it cool a bit then started it again. Cut a row of grass and smoked again. Today changed the air filter, emptied old gas, put fresh gas in, started it and cut about 3 rows before it smoked again.
 
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  #2  
Old 08-01-09, 08:39 PM
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You said possibly too much oil. Is it or not? Possibly the reason.

I'm surprised it ran on 3 yr old gas. You may wind up with more problems from pouring that in it.
 
  #3  
Old 08-02-09, 06:13 AM
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white smoke i believe is from water in gas , drain the tank and check the carb make sure it's good and clean, when inspecting the carb you'll prob. see and whittish color on the inside, clean it. maybe rebuild
 
  #4  
Old 08-02-09, 10:36 AM
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Could very well be

because condensation builds up in the can of gas over 3 years mixing water with it. May sound silly but how do you drain the gas/oil? Yesterday I tipped it upside-down to get ALmost all of it out.
 
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Old 08-02-09, 11:07 AM
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Water in the gas is not the cause and doesn't cause white smoke, but draining it would probably be a good idea since it's so old. I suspect you overfilled it with oil and it was burning some of the excess off.
 
  #6  
Old 08-02-09, 07:57 PM
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the dipstick is tough to read

for some reason. The bottom where it says add is dark brown and wet while the full area is so slightly greased that I have to clean it to see if anything is on the rag. i guess it is overfilled, but when i take the cap off it's smoking so it's tough to see what's in there.

Again, i changed the gas, the air filter, did nothing with the oil. Started her up. She eventually smoked 3 times while cutting 3/4 of the backyard lawn, and never started again after the last smoking. And I pulled like a madman
 
  #7  
Old 08-02-09, 09:03 PM
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what cheese said, most likely the white smoke is from

oil , ie overfilled crankcase

i used to mechanic at a auto dealership and one time while doing a major checkup (in the 70s) on a car, i was using the ceiling mounted oil line with the auto dispenser that had a counter on the handle showing how much oil had been pumped - someone distracted me while i was pumping in new oil, and it went past zero without my noticing - so it ended up with 10 or more qts in the crankcase

i started engine to let it run so i could check filter etc for leaks before taking it out for road test, went up to parts counter to get something, looked back - you'd thought the car had one of those smoke generators that acrobatic airplanes use - you could not see the back end of the shop

drop your oil, refill with exactly the amount the owner's manual sez and try it then
 
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