1996/02/16 Caterpillar

New Material Used In O-Rings And Optional New Block Side Cover Replacement{1201}

Usage:

3406, 3406B, 3406C and 3408 Commercial Engines

Description of Change: A new material is being used for all the straight thread O-ring plugs used on both sides of the cylinder block. The new O-ring material has a longer service life than the former O-ring.

On the 3406, 3406B, and 3406C an optional new, stronger cover can be used whenever the fuel injection pump is removed if there is an indication of leakage. The optional new cover is made of steel and has a groove for an O-ring instead of the former aluminum cover and gasket.

Adaptable To: Chart A identifies the new and former straight thread O-rings and Chart B identifies the new and former cover and gasket/seal.

Typical view of the straight thread O-ring Seals (1), and the production aluminum cover (3) and the production gasket (2).

Caterpillar Information System:

1996/02/16 Air Filter Indicator No Longer Provided{7452}

1996/02/16 New Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}

1996/02/16 Lubricant Used On Cylinder Head Bolts Changed{1100}

1996/02/16 Fuel Injector Sleeve Replacement Tooling{0703,1125}

1996/02/16 New Engine Information Plates Require More Information{1000}

1996/02/16 Closed Engine Crankcase Breather System Maintenance And Repair {1317,1107}

1996/01/17 New Engine Cylinder Liner Available {1216}

1996/01/17 New Main Bearing Provides Improved Oil Distribution {1203}

1996/01/17 New Intake Valve Lash Setting {1105}

1996/01/17 Turbocharger Nozzle Cleaning {1052}

1996/01/17 Special Edition Publication For The 3600 Deisel Family Of Engines {0374}

1996/01/17 New Water Cooled Exhaust Elbow Available {1059}

1996/02/16 New Brackets Help Prevent Damage To Engine Fuel Injection Lines Groups{1252}

1996/02/16 Phosphate Coating Added To Camshaft Lobes{1210}

1996/02/16 Record Turbocharger Serial Number On Warranty Claims{1052}

1996/02/16 Slip In Coupling Used Instead Of Bellows Assembly In Turbocharger Group To Improve Serviceability{1061,1065}

1996/02/16 New Drive Gear Used In Auxiliary Pump Group{1206}

1996/02/16 New Turbocharger Wash Water Lines Groups Used{1052}

1996/02/16 New Valve Rocker Arm Assembly And Rocker Arm Adjusting Screw Used{1123}

1996/02/16 New Cylinder Liner And Cylinder Liner Sleeve Help Prevent Carbon Buildup Around Piston Top Land{1216}

1996/02/16 New Oil Temperature Regulator Lowers Normal Engine Oil Operating Temperature{1330}

1996/03/19 Possible Sources of High Crankcase Blowby From Breather Tube{1317}

1996/03/19 Parts Manual Fuel Filter Lines Group Illustration Corrections{1262}

1996/03/19 Fuel Injection Pump Barrel Sealing Face Reconditioning{1251}