1996/02/26 Caterpillar

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

Usage:

3406, 3406B, 3406C and 3406E Truck 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:

1996/02/26 New Engine Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}

1996/02/26 Lubricant Used On Cylinder Head Bolts Changed{1100}

1996/02/26 Fuel Injector Sleeve Replacement Tooling{0703,1125}

1996/02/26 New Engine Information Plates Require More Information{1000}

1996/01/23 Basic Electronic Troubleshooting Guide Is Now Available{1900}

1996/01/23 False Logging Of Engine Retarder Diagnostic Codes{1900,1901,1119}

1996/01/23 Corrupted Fleet Trip Data{1900}

1996/01/23 Remanufactured Product Update{7754}

1996/01/23 Governor Spring Guide Press Depth{1287,1284}

1996/01/23 New Air Fuel Ratio Control (FARC) Air Line Routing For 3306 Truck Engines In Kenworth Trucks{1278}

1996/01/23 Tamper Resistant Plugs And Tamper Resistant Bolts Used To Prevent Changes To Air Fuel Ratio Control (AFRC) Setting{1278,1287}

1996/01/23 New Valve Cover Gasket{1107}

1996/02/26 Modification For 9U-7256 Guide Assembly (Camshaft){1210,0701,0702,0703}

1996/02/26 New Oil Pan Resists Cracking{1302}

1996/02/26 Troubleshooting Information For Horton Diesltemp© Fan Clutches{1359}

1996/02/26 Engine Coolant Loss And/Or Overheating Can Be Caused By Incorrect Shunt Line Connection{1380}

1996/02/26 New Speed/Timing Sensor {1912}

1996/03/27 Possible Sources of High Crankcase Blowby From Breather Tube{1317}

1996/03/27 New Jake Brake Slave Piston Lash Setting{1119}

1996/03/27 False Logging Of Cylinder Fault Codes While Using The Engine Retarder{1900,1901,1119}

1996/03/27 Uprateability Improvements{1902}

1996/03/27 Personality Module Covers On Electronic Control Modules (ECM'S){1902}

1996/03/27 Electronic Changes And Features{1901}

1996/03/27 Camshaft Conversion Kits Available{1110}