1977/09/05 Caterpillar

Installation Procedure For Crankshaft Wear Sleeves Changed{1202,1160,1161}

Usage:

3406 and 3408 Industrial, Marine and Truck Engines;
3412 Industrial and Marine Engines;
988B Loaders;
621B, 623B, 631D, 633D, 637D, 637D P.P. Tractors;
245 Excavators, and 16G Motor Graders

The installation procedure for crankshaft front and rear wear sleeves has been changed. This was done to prevent possible oil leakage under the sleeves.

The new installation recommendation is as follows: Clean and put a layer of 8M8060 Quick Cure Primer on the inside circumference of the wear sleeves and the outside circumference of the crankshaft. Then put 9S3265 Retaining Compound on the outside circumference of the crankshaft and the inside circumference of the wear sleeves before the wear sleeves are installed on the crankshaft. Use the procedure shown in the Service Manual to install the wear sleeves.

Caterpillar Information System:

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}

1977/08/22 Installation Of Generator Sets On Rigid Bases{4450}

1977/08/22 Problems With Oil Or Fuel Filters{1261,1318}

1977/08/22 Be Sure To Drain Oil In BrakeSaver At Every Lubricating Oil Change Period{1155,1300}

1977/08/22 Improved Coolant Seal For Connection Between Cylinder Heads{1100,1350}

1977/08/22 Tools Now Available To Ream And/Or Hone 0.500" (12.70 mm) Diameter Valve Guides{0663}

1977/08/22 New Main And Connecting Rod Bearings Are Made Of Higher Strength Material{1230}

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 Field Repair Of Cooler Cores Made Of Aluminium{1063,1374,1375}

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

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

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

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

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}