oil in carb under load

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  #1  
Old 04-24-09, 01:50 PM
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oil in carb under load

idle and full range rpm no smoke. when engaging pto to mow smoke from exhuast. Can move the mower forward and reverse with no smoke until the blades are engaged. Yardman 42 inch mower 17.5 hp B&S. 277hrs
 
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  #2  
Old 04-24-09, 04:22 PM
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Why do you say oil in the carb?

Depends a little on what color the smoke is, but with only 277 hours, I would assume the smoke is kind of black?

What is happening with that in mind is the engine is running on the mid load circuits, which apparently are adjusted about right (or could be a little rich). When you put the big load on it the governor opens up the carb throttle plate and the engine hits an over rich setting.

There would be an adjustment screw for that. If you post the engine numbers someone here will be able to pinpoint where that is.
 
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Old 04-24-09, 07:20 PM
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What engine does t have (#s)? Briggs had a lot of 17 horse engines. Some single cylinders, some twins, some overhead valved, some flatheads, etc...

What color smoke?

Did this begin gradually or all of a sudden?

Does it use oil?

Is the oil level full, overfull, and does the oil smell like gas?

How do you know there is oil in the carb? You see it there?
 
  #4  
Old 04-25-09, 12:55 PM
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oil in carb

Model# 311777-0120-E1 17.5hp. There is oil coming out the breather. Oil level at the add mark. Pulled breather off and cleaned the oil out. None of the gov or throttle linkage has been messed with. Pulled manifold off and cleaned out oil. Checked B&S website, possible bad breather or head gasket. Bought this yardman 42" riding mower for 150 bucks a couple of days ago and only used it for 5 min. Deck spindles have been replaced last summer so that works smoothly.
 
  #5  
Old 04-25-09, 01:02 PM
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With that in mind disregard the carb setting and rethink it with a crankcase pressure issue. Likely a leaking headgasket.
 
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Old 04-25-09, 06:27 PM
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I agree. probably a head gasket leak.
 
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