The injectors do not even touch the injector tube. The tube only keeps coolant away from the injectors.
Most of the chips stick to the cutter which I wipe off after each cut.
After the seat cleans up, I insert a strong magnet down into the piston chamber, which sucks up the small amount of cast iron powder which may have fallen there. After the first fire of the piston, the little bit of powder which remains, will go out the exhaust.
Cat injector misfire under heavy load
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Truck engine machinist, Aug 10, 2013.
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I'll try again.
This is a cutaway of a Cat C-15 head. I have received several questions as to why not just replace the injector tube. As you can see, the injector seats entirely on the head. The injector does not even touch the tube. If the injector seat in the head is not true, the combustion leaks past the seat and comes up along side of the injector. The combustion then reaches the injector fuel o-ring and it is only a matter of time until it fails. The only way to correct the problem, is to true up the injector seat, or replace the head. A reman head could be somebody else's problem head just like yours.Last edited: Aug 12, 2013
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