CARRIER-PLANET 20R1880 - Caterpillar

4.5"
, 4.75"
, 5.4"
and 5.75"
Bore Caterpillar EnginesSUPPLEMENT: 09/27/78ENGINE NEWS, AUGUST 30, 1978, PAGE 5.In the article "Improved Piston Pins Are Made of Different Material For Better Hardness Characteristics When Heat Treated", add 6.25" to the engine bore sizes shown in the sub-title. New piston pins made of the improved material are also used in the 6.25" Bore Engines.
--------------- END SUPPLEMENT ---------------Description of Change: The piston pins used in the above engines are now made of a different type steel, and are heat treated with a different procedure. This improves the hardness characteristics of the piston pin for longer service life.Adaptable As: The new piston pins are direct replacements for the former piston pins, which are canceled. Specific part numbers are shown in Parts Book Microfiche and the NPR (Numerical Parts Record).