1977/10/03 Caterpillar

Washer Removed From Variable Timing Unit{1206,1272}

Usage:

3208 Truck Engines Equipped with Exhaust Gas Recirculation Systems

Description of Change: Starting with Serial Numbers 40S48467 through approximately 40S52461, a washer with a conical shape was installed, along with the 4N3371 Flat Washer at the variable timing unit as an "IN AND OUT" to evaluate its effect on timing. As the bolt on the shaft assembly of the tachometer drive is tightened, the washer puts a more even distribution of force against the gear. This decreases any relative movement of the gear on the shaft. That is, any movement of the gear in direct relation to movement of the shaft.

Adaptable To: The 98670 Washer does not have to be reinstalled (put back into) on 3208 Truck Engines equipped with exhaust gas recirculation systems. The 4N3371 Flat Washer must be used.

NOTE: If the conical shape washer is reinstalled, install the washer with the small conical end toward the bolt head on the shaft assembly of the tachometer drive (see the illustration).

Location and correct installation of 98670 Washer.

Caterpillar Information System:

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

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

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

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

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}

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

1977/09/19 Use Viscous (Fluid) Type Crankshaft Vibration Damper In Place Of Rubber Type Damper{1205}

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}

1977/10/03 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}

1977/10/10 Use Only The Larger Size Inserts To Make A Repair To Cylinder Block Counterbores For Cylinder Liners{1201,1216,1217}

1977/10/10 Improved Oversize And Undersize Connecting Rod And Main Bearings With Higher Strength Aluminum Alloy{1203,1219,1230}

1977/10/10 If The Fuel Setting Dimension Is More Than 7.00 MM, Remove The End Play Of The Camshaft To Make The Fuel Setting{1257,1286}

1977/10/17 Fabricated Extension Prevents Fuel "Splash" During Injection Valve Testing{0650,1254}

1977/10/17 Preparation Of Truck Engines For Cold Weather Operation{1300,1000}

1977/10/17 Improved Main, Thrust And Connecting Rod Bearings Have Aluminum Alloy With More Strength{1230}

1977/10/17 Separate Parts Of Oil Pump Cover Now Available{1304,1314}