1985/02/18 Caterpillar

Bleed Holes On Parts Service Cylinder Heads{1100,1101}

Usage:

3304B, 3306B, 3304, 3306, D330C, D333C Engines

Some of the parts service cylinder head groups shown in the chart have a spotfaced cooling system bleed hole. See the illustration. An 8N4485 Valve Assembly should be installed in the spotfaced bleed hole. External leaks at the bleed hole may occur if the valve assembly is not installed.

In the future, the 8N4485 Valve Assembly will be installed in all parts service cylinder head groups for 3300 Series Engines. Until that time, inspection of all parts is recommended. If the parts service cylinder head has a spotfaced bleed hole, install an 8N4485 Valve Assembly. Do not use the 8N4485 Valve Assembly on cylinder head groups that do not have the spotfaced bleed hole.

Location of spotfaced bleed hole.

Caterpillar Information System:

1985/02/18 New Transmission Control Valve And Pressure Relief Valve Are Used With High Flow Oil Pump{3313,3310}

1985/02/18 New Pressure Conversion Chart Available{0600}

1985/02/18 Increased Preload Used In Air Shutoff Actuators{7400,7418}

1985/02/11 Addition Of Lubricator Will Help Prevent Corrosion In Air Prelube Motors{1319}

1985/02/11 New Guide Assembly Used In Oil Level Gauge Group{1326,1300}

1985/02/11 Install Crankshaft Thrust Bearings Correctly To Avoid Damage{1202,1203}

1985/02/11 New Flashlight On 6V5000 Infrared Thermometer Group{0776}

1985/02/04 New Temperature Recorders Available{0600}

1985/02/04 Over Fueling Spring No Longer Used In Governor{1264,1250}

1985/02/04 Only The External Needle Valve Can Be Adjusted On Woodward EG3PC Or EG10PC Actuators{1265,1289}

1985/02/04 Tighten Bolts To Correct Torque In 3161 Governor{1264}

1985/02/04 Wiring Harness Conduit Component Sizes{1400,1408}

1985/02/18 New Drive Coupler Kit Used On Altronic Magneto{1552}

1985/02/18 Low Maintenance High Output Batteries Are Now Standard Equipment{1401}

1985/03/04 Use The Correct Oil In Natural Gas Engines{1318,0374}

1985/03/04 3406B Truck Engines Have Been Improved For 1985{1000,1050,1052,1100,1200,1250}

1985/03/04 New Water Cooled Exhaust Manifold Elbows And Rear Manifold Are Used{1059}

1985/03/04 Discontinued D.C. Generators Replaced By Alternators{1404,1405}

1985/03/04 3208 Truck Engine Service Manual Available In Spanish{0375}

1985/03/04 Exhaust Clamp Nut Now Serviced Separately{1061}

1985/03/04 Do Not Weld On Painted Surfaces{0350,0679}

1985/03/11 New Air Cleaner Element Creates Less Restriction{1054}

1985/03/11 Cross Link Between Fuel Racks Has Smoother Surface{1250,1257}

1985/03/11 Installation Of Heli-Coils In Holes With Damaged Threads{0600,0670,0671}