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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Engine run on

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Mike Ohio

06-25-2006 17:55:43




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I just bought a MF135 with AG3.152 gas. When I turn the key off it keeps chugging on. What can cause this?
Also there is a little blue smoke at idle after warm up.




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Mike Ohio

06-27-2006 15:00:55




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 Re: Engine run on in reply to Mike Ohio, 06-25-2006 17:55:43  
Thanks for the help. I will look at the timing,and this winter check the valve guides. Thanks again.



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Jerry/MT

06-25-2006 21:32:48




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 Re: Engine run on in reply to Mike Ohio, 06-25-2006 17:55:43  
Blue smoke at idle and not at high power is usually an indicator of worn intake valve guides and/or seals. At high manifold vacuum (idle) the intake valves are at a low pressure while under the valve cover, the pressure is near atmospheric, so oil is forced down the valve stem past the seals and guides if they are worn. At higher powers,the manifold vacuum decreases so the pressure differential is less and the ammount of oil leaking past decreases. Run on can be caused by retarded spark and/or overly lean carb mixture.

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smokey2

06-25-2006 19:37:31




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 Re: Engine run on in reply to Mike Ohio, 06-25-2006 17:55:43  
Pre ignition - probably all coked up inside. Give it some fuel treatment and a good run. Check the timing which may be out.



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