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Tractor Talk Discussion Forum

SMOKE

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J Smith

09-15-2007 19:47:02




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My Jubilee will smoke for a few seconds
when I first apply power then stops..
The plugs do not show any oil and it seems to stay close to full on the dip stick.
Oil blows out of the breather on the valve cover.
Could this be worn valve guides? The engine runs like a fine sewing machine...




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RAB

09-16-2007 09:04:27




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 Re: SMOKE in reply to J Smith, 09-15-2007 19:47:02  
Blue smoke or black smoke?
Do plugs show soot deposits?
Are they all similar?
Need a little more information before anyone is able to do anything better than guess.
Regards, RAB



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J Smith

09-16-2007 11:19:11




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 Re: SMOKE in reply to RAB, 09-16-2007 09:04:27  
All plugs are clean without any soot.
The smoke seems to be mostly black,
it only happens when I apply a lot of power
suddenly then goes away. No smoke is visable
running at full throttle or at operating speeds
The oil level will be down about a pint in 10 hours.



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RAB

09-16-2007 14:18:19




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 Re: SMOKE in reply to J Smith, 09-16-2007 11:19:11  
Right, if smoke is black it is most likely unburned fuel. Blue smoke is usually indicative of oil going down the guides. Oil down the guides usually builds up at idle (high vacuum in the inlet) and then burns blue when the revs are increased (and the oil is dragged through) but not necessarily for a lot of power. Most likely governor is putting carb temporarily too far open or there is an extra jet for acceleration. Don't know about the particular carb on it, so someone else will prolly now know how to deal with it.

Regards, RAB

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Native

09-16-2007 05:42:45




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 Re: SMOKE in reply to J Smith, 09-15-2007 19:47:02  
It sounds like worn piston rings allowing to much blow-by.



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Larry D.

09-16-2007 14:12:35




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 Re: SMOKE in reply to Native, 09-16-2007 05:42:45  
I Agree with NATIVE... In Ten Hrs Run Time an Engine can Burn "that" Much Oil and NOT Soot up the Plugs.. Larry KF4LKU



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