1995/03/01 Caterpillar

Jacket Water Pumps Now Include New Tapered Roller Bearings{1361}

Usage:

3408C (28V) Truck Engines

Description of Change: New tapered roller bearing water pumps are now used on the 3408C truck engine. The seal contact surface of the shaft is now induction hardened which improves wear resistance at the point of seal contact. The seal material has been changed to siliconized graphite that is more resistant to wear and less prone to deposit formation.

A new accessory drive idler shaft is used with the new water pumps. An additional hole has been added to the idler shaft to provide improved lubrication to the water pump tapered roller bearings.

Adaptable To: The new 117-4956 Water Pump Group is used on 3408C Truck Engines. The new pumps can only be used on engines that have the new 117-9712 Accessory Drive Idler Shaft. The former shaft does not provide sufficient lubrication for the new pump. The new water pump group and idler shaft are effective with 3408C (28V4921) Truck Engine . Engines prior to this serial number range should be serviced with the appropriate remanufactured water pump.

Caterpillar Information System:

1995/03/01 Used Engine Oil From 1995 3406C (8PN) Truck Engines Is Darker In Color{1318}

1995/03/01 Improved Air Fuel Ratio Control (AFRC){1278}

1995/03/01 Governors Now Use New Low Mass Weight Carrier{1272}

1995/03/01 New Fuel Injection Pump Group{1251}

1995/02/01 Returning Core Engines For Full Refund {0374}

1995/02/01 New Inlet And Exhaust Valves Have Thinner Heads{1105}

1995/02/01 Fabricated Tool For Holding Air Compressor Drive Gear While Tightening Nut On Compressor Crankshaft{0600,1803}

1995/02/01 Special Electronic Control Module (ECM) Used With J1939 Data Link And Eaton Autoshift Transmission{1901}

1995/01/01 Electronic Timing Advance Improvements{1272,1253,1264}

1995/01/01 Description Of January 1995 (JAN95) Personality Module Changes {1902}

1995/01/01 Electronic Unit Injector (EUI) Replacement{1290}

1995/01/01 New Oil for All Engines Burning Low-Sulfur Fuel (0.05% or less) Except The 3600 Family Of Engines{1318}

1995/03/01 Do Not Install A Water Pump Designed For The 3406E Truck Engine On 3406, 3406B Or 3406C Engines{1361}

1995/03/01 Cracks In Phenolic Water Pump Impellers In Remanufactured Water Pumps{1364}

1995/04/01 Tampering With Turbocharger Wastegate{1057,1052}

1995/04/01 Identifying Fuel Injection Pump Check Valves For Compliance With Current Emissions Requirements {1251}

1995/04/01 New Needle Valve Body Corrects Low Idle Surge{1264}

1995/04/01 Handling Electronic Unit Injectors (EUI){1290}

1995/04/01 124-5572 Air Pressure Relief Valve Available{1803}

1995/04/01 Air Compressor Installation Procedure{1803}

1995/05/01 Requirement For FLASH Programming Capability{1900,1901}

1995/05/01 New Rear Power Take-Off (RPTO) Has 1.3:1 Ratio{1165}

1995/05/01 Special Instruction Available For New Dedicated Power Take-Off (PTO){1900,1165}

1995/06/01 New Bolts With "Lock-Patch" Used In Front Timing Gear Groups{1206}