END BIT--R.H. 4D5757 - Caterpillar

Table 1
Status     3500 MUI
3500 with EUI     3500B    
New Part     282-0644 Piston (1)     278-0247 Piston (2)    
Former Part     233-2430 Piston (1)     233-2431 Piston (2)    
133-8383 Piston Crown As 144-0720 Piston Crown As    
( 1 ) Any combination of the new pistons and the former pistons can be used in different cylinders in the same engine.
( 2 ) Any combination of the new pistons and the former pistons can be used in different cylinders in the same engine.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.
Failure to install the correct piston cooling jet and retainer will result in inadequate lubrication. This will cause piston seizure and catastrophic engine damage. Install the correct piston cooling jet and the correct retainer.
Table 2
Status     3500 MUI
3500 with EUI     3500B    
New Part     282-0645 Piston and Rod Gp     281-6139 Piston and Rod Gp    
Former Part     223-6362 Piston and Rod Gp     223-6363 Piston and Rod Gp    
6I-2861 Piston and Rod Gp 101-0829 Piston and Rod Gp    
New Remanufactured Part     10R-4378 Cylinder Pack Gp     10R-4343 Cylinder Pack Gp    
Former Remanufactured Part     10R-1816 Cylinder Pack Gp     10R-1817 Cylinder Pack    
0R-4445 Cylinder Pack Gp 0R-9007 Cylinder Pack Gp