ENGINE AR 1W9406 - Caterpillar

Illustration 1 g03322581
New piston
Illustration 2 g03322578
Current pistonThe new piston in Illustration 1 is a direct replacement for the current piston in Illustration 2. The new pistons have the same weight and balance as the current pistons, and meet the same emissions standards. Cylinder packs that utilize current and new pistons can be used together in the same engine. Each cylinder pack with multiple designed pistons uses the same rings, rods, and pins as the previous piston. Refer to the following tables for the piston part numbers and the corresponding retainer clip for each cylinder pack.The new pistons are adaptable back to the first production of the engines in the above listed machines.
Table 1
Piston and Retainer Part Numbers for 10R-6007 Cylinder Pack Gp    
C15 Tier III Machine 18:1 compression ratio (c/r)    
Piston Part Numbers     Retainer Part Numbers    
247-6123     230-2569    
336-2879     230-2569    
346-6616     250-2940    
356-0420     250-2940    
388-9354     250-2940    
Table 2
Piston and Retainer Part Numbers for 10R-7172 Cylinder Pack Gp    
C15 Tier III Machine 16:1 c/r    
Piston Part Numbers     Retainer Part Numbers    
252-0656     250-2940    
346-6615     250-2940    
351-3756     250-2940    
356-0421     250-2940    
Table 3
Piston and Retainer Part Numbers for 10R-6010 Cylinder Pack Gp    
C27 Tier III Machine 16.5:1 c/r    
Piston Part Numbers     Retainer Part Numbers    
247-7791     230-2569    
341-7533     230-2569    
346-6617     250-2940    
356-0422     250-2940    
381-9250     250-2940    
Table 4
Piston and Retainer Part Numbers for 10R-6011 Cylinder Pack Gp    
C27 Tier III Machine 18:1 c/r    
Piston Part Numbers     Retainer Part Numbers    
247-7792     230-2569    
341-7534     230-2569    
371-9037     250-2940    
346-6618     250-2940    
376-7362     250-2940