TUBE A 3G3591 - Caterpillar

Illustration 1 g02611218
View of new piston
Illustration 2 g02617282
View of the current pistonThe new piston that is shown in Illustration 1 is a direct replacement for the previous piston design that is shown in Illustration 2. The new pistons have the same weight and balance as the previous pistons, and meet the same emissions standards. Cylinder packs that utilize the new and previous pistons can be used together in the same engine, but the same cylinder pack part number must be used in all cylinders. Refer to the following Tables for the piston part numbers and the corresponding retainer clip for each cylinder pack. Each cylinder pack with multiple designed pistons uses the same rings, rods, and pins as the previous piston. Note: The 325-9492 Piston Body As or the 10R-9611 Cylinder Pack As must not be used any other piston or cylinder pack. The 325-9492 Piston Body As is heavier than the 356-4787 Piston Body must not be mixed within the engine, and must be used in sets of six.Refer to the following Tables for the piston part numbers, and the corresponding cylinder packs.
Table 1
Piston and Retainer Part Numbers for 10R-3304 Cylinder Pack As    
2004 Truck, BXS, MXS, NXS, 18:1 c/r, 550 hp and below    
Piston Part Numbers     Retainer Part Numbers    
10R-2151     230-2569    
232-6557    
313-5534     250-2940    
248-5514    
284-8983    
306-7460    
356-4787    
358-6261    
Table 2
Piston and Retainer Part Numbers for 10R-6215 Cylinder Pack As    
2007 Truck, S/N:SDP1-24436, 18:1 c/r, 550 hp and below    
High Load 2004 Truck, BXS, MXS, NXS, 550 hp and below    
Piston Part Numbers     Retainer Part Number    
313-5534     250-2940    
248-5514    
284-8983    
306-7460    
356-4787    
358-6261    
Table 3
Piston and Retainer Part Numbers for 20R-0430 Cylinder Pack As    
2007 Truck, SDP, 17.1:1 c/r, 600 hp and above    
2004 Truck, BXS, MXS, NXS, 17.1:1 c/r, 600 hp and above    
Piston Part Numbers     Retainer Part Number    
10R-8336     250-2940    
248-5516    
356-9946    
358-6262    
Table 4
Piston and Retainer Part Numbers for 10R-9611 Cylinder Pack As    
2007 Truck, S/N:SDP20437-UP, 18:1 c/r, 550 hp and below (Heavy Piston)    
2004 Truck, S/N:NXS33194-UP S/N:KRA04716-UP, 18:1 c/r, 550 hp and below (Heavy Piston)    
Piston Part Number     Retainer Part Number    
325-9492     250-2940    
Illustration 3 g02616200
Proper orientation of retainer (A) 45 degreesThe retainer, and the requirement for retainer orientation can vary. The opening of the retainer can be installed 45 degrees in either direction from the vertical position. Refer to Illustration 3.