New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}
Usage:
3406, 3408 and 3412 Engines in All Applications
Description of Change: The temperature at which the new water temperature regulator will open is 180°F (82°C) on 3406, 3408 and 3412 Engines in all applications. The former regulator opened at a temperature of 175°F (79°C). This change was made to give hotter coolant to the cab heater.
Also, the new regulator, like the former regulator, has a maximum leakage rate of 50 cc per minute at the main valve with a 30 psi (207 kPa) pressure difference across the valve.
Adaptable As: Direct replacement.
Caterpillar Information System:
1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}
1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}
1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}
1978/02/06 Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}
1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}
1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}
1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}
1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}
1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}
1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}
1978/01/30 New Spring Used In Belt Tightener And/Or Fan Drive Groups{1358,1359}
1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}
1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}
1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}
1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}
1978/02/13 Several Improvements Made To Lines Group In Area Of The Hitch{5057,5077}
1978/02/13 Improvements Made To Push Frame; Instructions To Make Reinforcements On Earlier Push Frames Available{6225}
1978/02/13 Strip Added Under The Hinge For The Front Windshield On ROPS Cabs{7325}
1978/02/13 Check Degree Number On Timing Fixture Plate Assemblies{0650}
1978/02/20 New Transmission Valve Groups Increase Winch Line Pull When Transmission Is In Neutral{3150,3152,3157,3167,3100}
1978/02/20 Separate Parts Of Tire Valve Group Now Available For Parts Service{4202}
1978/02/20 Reinforcements For Front Frame{7051}
1978/02/20 Improved Lift Arm And Service Brace Now Used{0643,5102,6119}
1978/02/20 Muffler Mounting Group Now Used To Give More Support To Muffler{1062}