1995/04/01 Caterpillar

Tampering With Turbocharger Wastegate{1057,1052}

Usage:

3406C (3ZJ, 4CK, 8PN),
3406E (5EK) Truck Engines Equipped With A Turbocharger Wastegate

We have had some reports from the field that wastegate line (1) has been either clamped shut or plugged, or the length of rod (2) has been changed. These changes have been made with the expectation of improved engine performance and braking efficiency.

Locations of wastegate line (1) and rod (2).

These changes will NOT enhance engine performance or braking efficiency, even though the boost pressure may show some increase. Tampering with the wastegate can cause excessive pressures and temperatures that could result in damage to the turbocharger, the air to air aftercooler, and/or engine. Also, since the emissions of the engine will change, the engine will no longer be in compliance with EPA certification.

Caterpillar Information System:

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

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

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}

1995/04/01 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}

1995/06/01 Finding Top Dead Center (TDC) For Setting Valve Lash{0374}

1995/07/01 Adapter Ring Required For 6-0799 Exhaust Restrictor Group{1050}

1995/07/01 Service Cylinder Head Assemblies Have Round Exhaust Ports{1100,1101}