1977/09/19 Caterpillar

Use Viscous (Fluid) Type Crankshaft Vibration Damper In Place Of Rubber Type Damper{1205}

Usage:

3306 Truck Engines

Description of Change: Two different types of vibration dampers have been used on the crankshafts of 3306 Truck Engines: A viscous (fluid) type and a rubber type. Later engines are equipped with either of two viscous type dampers, but earlier engines used a rubber type damper. In some applications, the service life of the rubber type damper was short. A viscous type damper is now used on these engines, and can be installed in place of the earlier rubber type damper. In conditions where there is a failure of the rubber type damper, install a viscous type damper for replacement.

Adaptable As: Direct replacement when the necessary parts are used together. For some installations, the crankshaft pulley must be changed. The parts chart shows the correct parts to use together.

Caterpillar Information System:

1977/09/19 Changes To The Injection Pump And The Fuel Setting{1251,1257}

1977/09/12 New Refrigerant Compressors And Kits With Improved Seals; Conversion Of Earlier Units{7320}

1977/09/12 The Discrepancy Card Has Changed{0374}

1977/09/05 Field Repair Of Cooler Cores Made Of Aluminium{1063,1374,1375}

1977/09/05 Check For Extra Holes In Crankshaft Flange If Oil Leaks From Between The Flywheel And Crankshaft Flange{1156,1202}

1977/09/05 Installation Procedure For Crankshaft Wear Sleeves Changed{1202,1160,1161}

1977/08/29 More Bolts Hold Flywheel Housing Group{1157,1162}

1977/08/29 Anti-Corrosion And Break-In Coatings{0374,3256}

1977/08/29 Engine Valve Springs Are Now Made Of Stronger Steel{1108}

1977/08/29 New Tube Assemblies For Turbocharger Oil Lines; New Base Assemblies For Oil Filters{1052,1306,1307}

1977/08/29 Improved Cylinder Block With Spacer Plates Used With Improved Cylinder Heads And Cylinder Head Gaskets{1101,1201,1221}

1977/08/29 New Clutch Groups Used In Front Power Take-Offs; Service Kits Available{3055}

1977/09/19 Stronger Piston Is Used; Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}

1977/09/26 Use Correct Contact Point With Dial Indicator To Be Sure Of The Accuracy Of The Measurements Of Fuel Setting And Fuel Ratio Control Setting On Sleeve Metering Fuel Systems{0653,1250}

1977/09/26 Stronger Fan Drive Pulley Prevents Cracks During Assembly; Torque On Pulley Bolts Changed{1359}

1977/09/26 New Special Instruction Gives General Information On The Use Of The 5P6590 Wiring Harness Tester For Electrical System Testing{0650,1400}

1977/10/03 Change Is Made to Support Beam For Front Of Engine{0643}

1977/10/03 Turbocharger Heat Shields Are Stronger{1073}

1977/10/03 Washer Removed From Variable Timing Unit{1206,1272}

1977/10/03 Do Not Use Plastic Tubing With Brass Couplings As A Fuel Supply Line{1274}

1977/10/10 Be Sure To Drain Oil From The BrakeSaver At Every Lubricating Oil Change Period{1318,1155}

1977/10/10 Fuel Transfer Pump Shaft With Chromium Plate{1256}

1977/10/10 New Front Housing Has Stronger Boss For Alternator{1151}

1977/10/10 Troubleshooting The Tachometer System Of The 4S6553 Engine Instrument Group{0651}