2006/06/26 Caterpillar

Caterpillar Products:

3500 Family Pumpers

3500 and 3500B Family Generator Sets and Power Modules with Standard Displacement

Engine: Commercial

3500 and 3500B Engines with Standard Displacement

Description of Change: The former pistons have been cancelled and replaced by new pistons. The former remanufactured cylinder packs which included the one-piece pistons are also cancelled and replaced by the cylinder packs with the new pistons.

Adaptable To: The new pistons are suitable for use in the above Engines. The 278-0247 Pistons are a direct replacement for the cancelled 233-2431 Pistons and for the cancelled 144-0720 Piston Crown As. The 282-0644 Pistons are a direct replacement for the cancelled 233-2430 Pistons and for the cancelled 133-8383 Piston Crown As. The remanufactured cylinder packs are direct replacements for the former cylinder packs, which are cancelled.

Note: The diameter of the eye in the connecting rod has not changed.

Note: Some of the parts that were used with the former pistons are still serviceable for repair. The following parts are still serviceable: 263-8955 Piston Pin, 253-1238 Pin Retainer, 214-6066 Piston Ring (Top), 144-5695 Piston Ring (Intermediate ring) and 223-6361 Piston Ring (Oil) .The 204-5447 Piston Cooling Jet As and 193-3282 Retainer As are reused with the new pistons. The piston cooling jets and the retainer for the piston cooling jets must be replaced if you are changing from two-piece pistons to one-piece pistons.