1997/01/27 Caterpillar

Points To Remember When Replacing A Viscous Crankshaft Damper Assembly With A Rubber Crankshaft Damper Assembly{1205}

Usage:

3406, 3406B, 3406C, And 3406E Truck Engines

SUPPLEMENT: 02/01/97

Truck Engine News, January 1997, Page 4, "Points To Remember When Replacing A Viscous Crankshaft Damper Assembly With A Rubber Crankshaft Damper Assembly"

The title of the article is NOT correct. The correct title follows:

Points To Remember When Replacing A Rubber Crankshaft Damper Assembly With A Viscous Crankshaft Damper Assembly

--------------- END SUPPLEMENT ---------------

Reference: Truck Engine News, August 1995, Page 6, "Recommendations For Inspection And Replacement Of Rubber and Viscous Crankshaft Dampers".

Truck Engine News, April 1996, Page 1, "Viscous Damper Assembly Used In Production".

When replacing a rubber crankshaft damper assembly with a 7E-9520 Viscous Crankshaft Damper Assembly:

* The viscous damper must have a 9Y-8870 Plate installed on the outside of the viscous damper.

* The washers must be removed from the bolts that fasten the damper to the crankshaft so the bolts will have the proper thread engagement.

Caterpillar Information System:

1997/01/27 Description Of August 1996 (AUG96) Software Modifications{1902}

1997/01/27 New Remanufactured Water Pump Groups Include Cast Iron Impellers{1361}

1996/12/23 New Oil Supply And Drain Lines In Turbocharger Oil Lines Groups Used With "Mid-Mount", "New Mid-Mount", And "Low Mount" Arrangements{1307}

1996/12/23 New Thinner Exhaust Manifold Gasket Used{1059}

1996/12/23 July 1996 Software Release{1902}

1996/12/23 Check Turbocharger Seals If There Is A Sudden Increase In Crankcase Blowby{1052,1317}

1996/11/01 Fuel Injection Pump Bushings Have New Groove Adjacent To Load Ring {1251}

1996/11/01 Improved Fuel Pump Plunger Helps Prevent Plunger And Sleeve Scuffing In Service 8.5 mm Fuel Injection Pump Assembly For Sleeve Metering Fuel System (SMFS) Governor And Fuel Injection Pump Groups{1251,1286}

1996/10/01 Improved Water Pump Groups Available{1361}

1996/10/01 New O-Ring Seals Used On "Through-Head-Adapter" And "Internal Fuel Lines" In Fuel Injection Lines Groups{1252}

1996/10/01 Procedure For Installing Steel Core Gasket At The Front Housing And The Flywheel Housing{1151,1157,1162}

1996/10/01 New Torque Specification For Injector Rocker Arm Adjustment Lock Nut{1123}

1997/01/27 Timing Procedure Aid -Alignment Of Timing Gear Marks On 3406 Engines{1206}

1997/01/27 New Gasket Used Between Air Compressor And Front Housing{1803}

1997/02/24 New O-Ring Seal Used In Hydraulically Actuated Electronic Unit Injector (HEUI) Pump Group{1714}

1997/02/24 New Specifications For Pressure Drop Across The Air-To-Air Aftercooler{1063}

1997/02/24 Improved Bushing O-Ring Seal Available For Injection Pump Groups{1251}

1997/02/24 Summary Of Changes To Timing Advance Drive Groups (Update){1272}

1997/02/24 New Oil Supply And Drain Lines In Turbocharger Oil Lines Groups Used With "Mid-Mount", "New Mid-Mount", And "Low Mount" Arrangements{1307}

1997/04/01 Improvements Made To Remanufactured 0R-3008 Fuel Transfer Pump{1256}

1997/04/01 Description Of March 1997 (MAR97) Software Modifications{1920}

1997/04/01 New "Fuel System Reuse And Salvage Guides" Reference Manual Available{1250}

1997/05/27 Procedure To Investigate Misfires On Engines Equipped With Electronic Unit Injectors (EUI){1290}

1997/05/27 Special Installation Procedure For Alternator Support Brackets{1405}