1984/10/15 Caterpillar

New Water Temperature Regulator Has Higher Temperature Setting{1355}

Usage:

3406, 3406B, 3408, 3408B Truck Engines

Description of Change: A new water temperature regulator is being used on the above engines. The new regulator opens at 88°C (190°F) in comparison with the former regulator that opens at 82°C (180°F). The new higher temperature regulator will help the engine give improved fuel economy.

Adaptable To: The new 4W4842 Water Temperature Regulator is in effect with 3406B Truck Engines (7FB11526 and Up) and 3408B Truck Engines (28V4681 and Up).

The new 4W4842 Water Temperature Regulator can be used to replace 9N3720 Water Temperature Regulator in earlier 3406 (92U), 3406B (7FB) and 3408 (28V) Truck Engines.

It is important that the fan control, shutter control, alarm control and shutdown control have the correct operating temperature to work with the new 4W4842 Water Temperature Regulator. If the 88°C (190°F) thermostat is used in place of a 82°C (180°F) thermostat and the fan control is not readjusted, the fan will operate excessively. Excessive fan operation will give reduced fuel economy. When the new regulator is installed, make adjustments or replacements to the controls for the attachments as shown in the charts.

Caterpillar Information System:

1984/10/15 New Continuity Testing Light Available{0600,0785}

1984/10/15 New High Alloy Material Is Used In Cylinder Head Assemblies{1101}

1984/10/15 Seal Kits Available For Hydraulic Cylinders{5050}

1984/10/08 Deflection Of Flywheel Housings Should Be Controlled During Transportation{1157}

1984/10/08 Temperature Adapter Group Can Be Used With A Caterpillar Multimeter{0776,0785}

1984/10/08 Wiring Changed On Voltage Regulators{4467}

1984/10/08 Information For Reversing Crankshaft Rotation Of All 6.25" Bore V8, V12 And V16 Engines{1000}

1984/10/08 Make Sure There Is Clearance Between The Propeller Shaft Fastener And The Transmission Output Flange{3305}

1984/10/01 Improved Oil Separator Elements Have Longer Service Life{1317,1202,1161}

1984/10/01 Helper Spring Groups Improve Operation Of Air Shutoff Groups{7400,7418}

1984/10/01 New Cylinder Block Groups Used{1201}

1984/10/01 New Gaskets Give A Better Seal To Watercooled Exhaust Manifolds{1059}

1984/10/15 New Indicator Lamps Used On Generator Control Panels{7002}

1984/10/22 New Heat Exchanger Group Has More Cooling Capacity{1379}

1984/10/22 Improvements Made To Fuel Filter Housing{1260,1261,1262}

1984/10/22 Changes To Water Lines Group Increase Coolant Flow Through Exhaust Manifold{1059}

1984/10/22 Information For Testing 8N7004, 4W7011 And 4W7015 Fuel Injection Nozzles{1254}

1984/10/29 Cetane Injection Group Uses New Orifice, Tee and Seals{1250,1274}

1984/10/29 Foil Shield Will Help Prevent Electrical Interference In Engine Set Point Indicator{0781,0785}

1984/10/29 New Oil Filter Group Can Be Used To Extend Oil Change Interval{1306,1318,1326}

1984/10/29 New Cylinder Head Gasket Helps Prevent Oil Leakage Around Gear Pocket{1101}

1984/10/29 New Heat Shield For Wiring To Electrical Shutoff Group{7400,7403,7418}

1984/10/29 New Cylinder Heads, Fuel Nozzles And Fuel Nozzle Adapters Used{1101,1106}

1984/10/29 New Diaphragm Used In BrakeSaver Control Valve Group{1159,1155}