1999/07/01 Caterpillar

New Piston Assembly Used {1214}

Usage:

3606 (8RB732),
3608 (6MC596, 5PG106, 8LL11, 7WR26),
3612 (9RC, 9FR21, 2NZ176),
3616 (1PD, 1FN150) Engines

Description of Change: A new piston assembly is used in these engines. The new piston assembly includes two changes when compared to the former design. The chrome plating on the outer abutment of the crown has been removed. The inclination of the third land of the skirt has been removed. See (A) in the illustration.

Adaptable To: The new 172-6772 Piston Assembly is a direct replacement for the former 121-7555, 121-4068, and 4P-0399 Piston Assemblies. The former piston assemblies have been canceled. The illustration and chart identify the serviceable parts of the 172-6772 Piston Assembly. The serviceable parts of the new and former piston assemblies should not be mixed.

Identification of components in the 172-6772 Piston Assembly. Third Land and Outer Abutment location (A).

Caterpillar Information System:

1999/07/01 High Performance Aftercooler (HPAC) Parts Kits Available {1063}

1999/07/01 Worldwide Listing Of ABB Turbocharger Service Stations {1052}

1999/07/01 Operation And Maintenance Manual For 3600 Diesel Marine Monitoring System Has Been Revised {0374,7490}

1999/07/01 "Guidelines For 3600 Heavy Fuel Oil (HFO) Engines" Has Been Revised {0374,1000}

1999/07/01 O-Ring Seals Included On Terminal Assembly For The Electronic Ignition System (EIS) Transformer Group {1561}

1999/07/01 Be Sure The Cylinder Head Bore For the Unit Injector Is Clean When the Unit Injector Is Replaced {1290}

1999/07/01 New Fuel Priming Pump Assemblies Used {1258}

1999/07/01 New Basic Fuel Transfer Pump Group Includes New Outer Lip Type Seal {1256}

1999/07/01 New Position Sensor Group (Throttle) {1913}

1999/07/01 New Stronger Bolts and Washers Help Prevent Oil Leaks At Rear Power Take Off (RPTO) Flywheel Housing To Block Joint {1157}

1999/06/01 New Voltage Sensing Transformer Improves Reliability {4477}

1999/06/01 Rain Protection Shield Assemblies Available For Engine Junction Box And Engine Supervisory System (ESS) Control Panel {7426,7490,7555}

1999/07/01 New Connecting Rod Bolt Tightening Procedure {1218}

1999/07/01 Follow Fuel Changeover Procedure Before Synchronizing Fuel Injectors On Heavy Fuel Oil (HFO) Engines {1250,1274,1280,0374}

1999/07/01 Risks Of Extended Oil Change Interval Practices {1300}

1999/07/01 Centrifugal Oil Filter Group Revised To Allow Higher Operating Pressures {1328}

1999/07/01 A New Control Assembly (XYCOM Monitor) Is Used In The Marine Monitoring System (MMS); Special Instruction With Procedure For Replacing The Former Control Assembly With The New Control Assembly Available {1901}

1999/07/01 Marine Monitoring System (MMS) Thermocouple Wiring Color Codes {1906,1919,1921,1922,1929,7498}

1999/07/01 An Improved Watertight Junction Box Assembly And Watertight Electronic Box Groups Are Used {7426,7490,7555}

1999/08/01 Caterpillar Service Technology Group (CSTG) Software Help Desk Changes{1920}

1999/08/01 New Material Improved Durability For STAY CLEAN VALVE(r) In Caterpillar High Efficiency Fuel Filters{1262}

1999/08/01 Extended Life Coolant - Still the Coolant of Choice{1395}

1999/08/01 New Service Manuals and Revised Service Manuals Available{0374,1000}

1999/08/01 Cold Start Advance Solenoid Available{1272,1250}