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 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System{1350}
1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}
1978/02/06 Smaller Quantity Of Oil Now Used In Engine Oil Pan; Prevents Contact Between Crankshaft And Oil{1318}
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 Stronger Front Support Assembly{1153}
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 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}
1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1978/01/23 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups{1264,1278,1286}
1978/01/23 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal{1265,1269}
1978/01/16 Improved Gasket Prevents Oil Leakage From The Governor{1264}
1978/01/16 Turbine Housing For Turbocharger Is Stronger{1052}
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}
1978/02/27 New Seal Assembly With Longer Ferrule Prevents Damage To Ferrule During Cylinder Head Installation{1100,1101,1300}
1978/02/27 Fabricated Adapters Permit Horizontal Mounting Of Transmissions On 1P2420 Transmission Repair Stand{0640}
1978/02/27 Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit{1202,1160,1161}
1978/02/27 Stronger Exhaust Manifold Gasket Now Used{1059}
1978/02/27 Improved Fuel Priming Pump Assembly Has Better Sealing Characteristics; Repair Kit Available For Knob{1258}
1978/02/27 Modification Of Oil Pan For Installation Of Oil Sump Heater{1302}
1978/02/27 New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For the Tachometer Drive Group And Transfer Pump{7462,1256}
1978/03/06 Stronger Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218}
1978/03/06 5P8558 Pressure Gauge Calibrating Group Checks Pressure Gauges{0650}