1977/08/29 Caterpillar

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

Usage:

3406 Industrial and Truck Engines;
245 Excavators;
621B, 623B Tractors

Description of Change: New tube assemblies for the turbocharger oil lines and new base assemblies for the oil filters are used on the above models. On the 3406 Industrial Engines with water cooled exhaust manifolds, only the base assembly is changed. The new parts have a different type of connection for the tube assemblies and the base assemblies. The end of the former tube assembly was flared (pushed out at an angle) with a nut to go over the flared end to seal the tube assembly. On some of the engines, this connection leaked oil. The hole in the former base assembly for the turbocharger had tapered pipe threads. If the connector was tightened too much when it was installed in the former base assembly, the base assembly can crack.

The new tube assembly uses a compression-type sleeve to seal the tube. Also, the hole in the new base assembly has straight threads to prevent cracks. An O-ring is used in the hole with the connector.

Adaptable To: The new parts are adaptable to earlier engines when the necessary parts are used together.

Caterpillar Information System:

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}

1977/08/15 Tools From Caterpillar To Test And Charge Air Conditioners And For Repair Of Frigidaire Compressors{7320,0651}

1977/08/08 Clean Bolt Holes In Cylinder Block Before Cylinder Heads Are Installed{1101,1201}

1977/08/08 New Air Inlet Manifold Has Longer Bolt Bosses With More Thread Depth To Keep Bolts Tight{1058}

1977/08/08 Spacers Added To Alternator Group To Improve The Mounting{1405}

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

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

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

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

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}