New Water Temperature Regulator Has A Closer Fit At The Valve Seat To Keep Leakage At A Minimum{1355}
Usage:
D342, D343, D346, D348, D349, D379, D398, D399, 3406 and 3408 Engines in Some Applications
Description of Change: A new water temperature regulator is used which has a maximum leakage rate of 50cc per minute at the main valve with a 30 psi (207 kPa) pressure difference across the valve. The former regulator did not have a specification for a maximum valve leakage rate and the leakage rate was approximately one to two gallons per minute (3.8 to 7.6 litres per minute). The new regulator will cause the engine to warm faster and/or keep the engine coolant warmer in conditions of small loads. The regulator valve is fully open at 197°F (92°C).
Adaptable As: Direct replacement.
Caterpillar Information System:
1977/01/17 New Flywheel Assemblies Are Available For Use With Spicer Transmissions{1156}
1977/01/17 New Tie Bars Improve Stability Of The Fuel Injection Test Bench{0652}
1977/01/17 SIRS Component Code List{0331}
1977/01/17 New Special Instruction For Troubleshooting 5P2150 Engine Horsepower Meter{0651,1250}
1977/01/17 Blades For Hose Saw Cut Off Group Must Now Be Sent To New Address To Be "Resharpened"{0664}
1977/01/17 Improved Main And Connecting Rod Bearings Have Aluminum Alloy With More Strength{1230}
1977/01/17 Removal Of Bolts With Metal Locks Easier With New Sockets{0610}
1986/12/22 New Torque Control Group Used In Governor And Fuel Injection Pump Group{1264}
1986/12/22 New Oil Level Gauges (Dipsticks) With "Full Range" Used{1326}
1986/12/22 Fuel Dilution Troubleshooting Procedure{1250}
1986/12/22 Use Heli-Coils To Repair 5.4" Bore Engine Rocker Arm Assemblies{1123,1105}
1986/12/22 Engine Power Increased{1250}
1977/01/24 Drain All Coolant From Engines Before Shipment For Remanufacturing{0355,1350}
1977/01/24 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings{1061}
1977/01/24 Exhaust Valve Guides With A Counterbore Are Now Available{1104}
1977/01/24 Adapter For Disassembly And Assembly Of Turbocharger Cartridge{0620,1053}
1977/01/24 Same Valve Camshaft Assembly Used On Direct Injection Engines Now Used On Engines That Have Precombustion Chambers{1210}
1977/01/24 Coupling With A Slip Fit Now Used At Turbocharger Exhaust Outlet Instead Of Coupling With Piston Rings{1061}
1977/01/24 New Cylinder Liners{1216}
1977/01/24 Lightening Holes Not Drilled In Some Crankshafts{1202}
1977/01/31 New Disconnect Switch Assembly Has Better Resistance To Corrosion{1411}
1977/01/31 Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy{1203}
1977/01/31 New Remote Control Switch Assembly For Electric Hydraulic Pumps{0621,0623}
1977/01/31 Transportation Notice Plate Is No Longer Needed For Pressurized Nitrogen Cylinders{7557}