IMPELLER-PUMP 7W5769 - Caterpillar

Engines:
3606 (S/N: 8RB)
3608 (S/N: 6MC)
3612 (S/N: NZA; 9RC; 9FR; 2NZ)
3616 (S/N: 1PD; 1FN; RMN)
Description of Change: A new piston is available for use on the above engines. This new piston has an improved joint between the crown and the skirt. This new piston is significantly heavier than the earlier pistons that are used in these engines. Because of the heavier weight, the new pistons must be installed in every cylinder of the engine. The new piston is designed to work with the existing piston rings, connecting rod, piston pin, and cylinder liner.Adaptable To: The new 218-3589 Piston is effective with the engines that are listed in the table.
Table 1
Effectivity of the New 218-3589 Piston    
Model    Serial Number    
3606     S/N:8RB00870-UP
   
3608     S/N:6MC00663-UP
   
3612     S/N:9RC00384-UP
   
3616     S/N:1PD00393-UP
   When used in complete sets, the new 218-3589 Piston can be used as a direct replacement for any of the earlier pistons that are used in these engines.Note: Because of the weight of the new piston, the new 218-3589 Piston CAN NOT be mixed with any previous pistons that are used in these engines. If the 218-3589 Piston is used, all of the pistons in the engine must be 218-3589 Pistons .The 172-6772 Piston will remain available for parts service. This piston can be used to replace individual pistons in engines that are not equipped with 218-3589 Pistons.