1995/02/01 Caterpillar

New Inlet And Exhaust Valves Have Thinner Heads{1105}

Usage:

3406C And 3408B Truck Engines

Description of Change: The maximum valve head thickness of the new exhaust valve and the new inlet valve has been reduced by 0.146 mm (.0057 in). The "use again" thickness for the valve lip remains the same. Refer to the Specifications module in the service manual. The reduced maximum head thickness is required for piston to valve clearance on the 3406C mechanical truck engine with the swirl combustion system (serial number prefix 8PN).

Adaptable To: The new 115-2367 Exhaust Valve is a direct replacement for the former 106-1111 Exhaust Valve. The new 115-2368 Inlet Valve is a direct replacement for the former 108-5902 Inlet Valve. The former valves are canceled. The new inlet and exhaust valves are effective with 3408B Truck Engines (28V04923) and 3406C Truck Engines (5KJ08083, 3ZJ60182, 8PN1).

Valve comparison. (A) Profile of new valve. (B) profile of former valve.

Caterpillar Information System:

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}

1994/12/01 Black Painted Valve Covers Available{1107}

1994/12/01 New Exhaust Manifold Gasket Available{1059}

1994/12/01 Cold Weather Operation Reminder{0374}

1994/11/01 Be Sure Correct Piston Cooling Jets Are Installed{1331}

1994/11/01 Engine Oil Capacity Change{1326,7542}

1994/11/01 Unit Injector Removal And Installation{1290}

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

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

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

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

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

1995/03/01 Jacket Water Pumps Now Include New Tapered Roller Bearings{1361}

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}