Posted by Owen Aaland on February 11, 2010 at 14:00:27 from (65.165.246.14):
In Reply to: Best plug for H posted by ryanwheelock on February 11, 2010 at 11:12:37:
The correct spark plug for your engine is the one that will give good life without fouling and yet run cool enough to avoid preignition. On some worn engines you may need to run plugs of different heat ranges in one or more cylinders.
The original spark plug recommendation was a Champion D16 for general use. That was changed (50's - 60"s?) to a D15Y which is one heat range colder but with an extended tip to get the spark further into the combustion chamber. With the end of leaded gasolines the recommended plug was changed to D18Y for general use. A D15Y is still recommended for use with heavy loads. A D21 can be used for light loads. If you use a D21 under heavy use you will get preignition caused by an overheated spark plug igniting the fuel load before the spark occurs.
If when you shut off the tractor and it wants to keep running by dieseling it is a good indication of too hot a spark plug. Engines that are burning some oil can use the hotter plug because the buildup of carbon on the electrode has an insulating effect and makes the plug act as a colder style. Carbon buildup can also become hot enough to burn under heavy load and that can in turn lead to a preignition or dieseling condition.
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