Re: 706 looses power on long pulls

Posted by Owen Aaland on May 11, 2007 at 09:25:12 from (65.161.86.75):

In Reply to: 706 looses power on long pulls posted by cjd12000 on May 11, 2007 at 03:55:48:

I would check the spark plugs to make sure they are not too hot a heat range for what you are using the tractor. If it was not used under much load before it may well have hotter plugs to keep them from fouling. As the plugs heat up under load a hotter plug will not transfer the heat fast enough and the overheated plug can cause preignition, even to the point where the fuel mixture is ignited as it is being drawn into the cylinders. This will cause backfiring into the carburetor.

A Champion D21 can be used for engines under light load. Champion D18Y has become the new standard. Champion D15Y was the originally suggested plug. If you are loading the tractor enough you can get by using the D15Y plugs. Better to be too cold rather than too hot. If you start with a colder plug you can move to the next hotter if you have fouling problems. Be sure to go back to colder plugs for heavier use.

My Super C running a Woods 6 foot mower runs just fine with D15Y because it is usually under enough load to keep the plugs clean. On the other hand, my I2444 has D21s in it becuase it is used almost exclusively for loader work and D18Ys would sometimes foul out. Both engines have had recent overhauls and neither uses any oil but different loading requires different heat ranges on the spark plugs.

Preignition can occur just a few degrees before normal spark ignition and you may not be aware of it happening but it will cause the pistons to run much hotter and will lead to piston failure. Higher octane fuels can mask this problem by being less prone to preignition but it is better to run colder plugs to eliminate the source of the problems.

Replies:

• Re: 706 looses power on long pulls the tractor vet 10:19:58 05/11/07 (2)
  • Re: 706 looses power on long pulls chadd 11:54:26 05/11/07 (1)
    • Re: 706 looses power on long pulls the tractor vet 12:51:26 05/11/07 (0)

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