1994/10/03 Caterpillar

New Engine Crankshaft Rubber Damper Assembly Uses Improved Rubber Material{1205}

Usage:

Caterpillar Machines Powered By 3406, 3406B, Or 3406C Machine Engines

Reference: Service Magazine; September 7, 1992; Page 12; "Major Engine Component Changes". Service Magazine; November 21, 1983; Page 10; "Service Information For Balancers And Dampers".

Description of Change: A new rubber damper assembly is used on 3406C Machine Engines. The new damper contains an improved rubber material. The improved rubber material provides the following:

* Increased temperature resistance

* 25 percent higher damping

* Improved resistance to stiffening with time

* Improved bonding

Adaptable To: The new 108-4096 Damper Assembly replaces the former 2P-5149, 4P-4297, 9Y-4851, and 108-4097 Damper Assemblies. The new damper assembly is effective with 3406C Machine Engine 11N7428. Do NOT use a rubber damper on engines originally equipped from the factory with a 2P-4645 or 7E-9520 Viscous Damper Assembly.

The damper assembly part number is approximately 3.0 mm (.12 in) high, STAMPED on the front or back of the outer ring.

Caterpillar Information System:

1994/10/03 Oversize Fuel Pump Drive Idler Shaft Available To Salvage Cylinder Block{1206}

1994/10/03 Fan V-Belt Part Number Has Changed For Certain Models With The 3204 Engine{1357}

1994/10/03 New Mounting Hardware for Leveling Blade Arms Improves Retention{6051,6061}

1994/10/03 Special Instruction SEHS9803 Is Available For Reinforcing The 7U-1598 (Center) And 7U-1599 (Rear) Frame assemblies To Prevent Cracking{7200}

1994/10/03 Drive Shaft Lubrication Requirements{3253}

1994/10/03 New Flexible Exhaust Assembly Has Longer Service Life{1061}

1994/10/03 New Flexible Lines Used In Aftercooler Water Lines Group{1380,1063}

1994/09/26 New Gasket Provides Improved Sealing Between Air Compressor And Drive{1803}

1994/09/26 New Gears Reduce Noise And Pipe Plugs Make Installation Easier In Auxiliary Drive Group{1150,1165}

1994/09/26 Exhaust Dust Ejector Operation{1055,1068}

1994/09/26 Arc Suppressors Improve Life of Air Conditioner Thermostatic Switch{7337}

1994/09/26 Engine Maintenance Check Deleted{1100}

1994/10/10 New Exhaust Flex Hose Used To Avoid Leaks From System Vibration{1058}

1994/10/10 New Oil Cooler And Hose Improves Routing{1374}

1994/10/10 New Transmission Oil Filter With Improved Seal Area{3164}

1994/10/10 Larger Stick Cylinder Piston Bolts Prevents Loosening{5458}

1994/10/10 Improved Wheel Bearing Cone Anti-Rotation System Prevents Wheel Bearing Cones From Rotating On The Axle Housing{4208,4234}

1994/10/10 New Driveline Yokes Have Improved Sealing And Seal Protection{3253,3250}

1994/10/10 New Differential And Bevel Gear Group And New Axle Housing Used In Axle Drive Group To Increase Service Life{3260,3280}

1994/10/10 New Fittings For Drum Drive Motor{5057}

1994/10/10 New 106-7408 Engine Oil Film (Decal) Available{7557}

1994/10/17 New Spindles Reduce Scuffing On Front Tires{4205}

1994/10/17 Pipelayer Winch Brake Band Assembly{5405}

1994/10/17 Parking Brake Performance Can Be Increased/Interference Can Be Eliminated {4267,4251}