Engine/Transmission (1998.5 - 2002) Question about the stock pistons (just removed my head)

[GOT-Torque]

Just pulled my head to have some work done to it :-laf and noticed that one of the six pistons has the #6052 stamped in it while the other five have #6051. Just curious why they would be different? Was this one replaced at some point?



138,000 miles on truck, no service history other that a VP replacement just prior to me purchasing the truck.



Pistons looked good, could see the injector spray pattern, just a little carbon build up on the head. I guess I need to run the methanol injection alittle more often.



With the studs torqued to 120 ft-lbs, that head did not want to come off!

 

[jwilliams3]

All the pistons in your engine are original. Cummins used to use graded pistons to ensure proper height to the cylinder head surface.

 

[keimmmo]

I hadn't thought about the height on the diesel. On gassers it is common to find different stampings to match the finished diameter of the cylinders.



Steve Keim