For front gear train engines, install the exhaust pressure sensor into the water outlet connection. Refer to Procedure 019-376 in Section 19 of the CM2150 Electronic Control System, ISB, ISC, ISL, ISLe, ISDe, and QSB3.3 Engines Troubleshooting and Repair Manual, Bulletin 4021570.
If the thermostat is suspected to be malfunctioning, the opening temperature of the thermostat should be measured to determine if the thermostat is functioning correctly. NOTE: Do not allow the thermostat or thermometer to touch the container. Suspend the thermostat and a 100°C [212°F] thermometer in a container of water. Heat the water and check… Read More »
Clean the mating surfaces with an abrasive pad, Part Number 3823258 or equivalent, and a clean cloth. For front gear train engines, if the exhaust pressure sensor was removed , inspect the exhaust pressure sensor port for carbon build-up. If carbon build-up is found, make sure that all exhaust pressure sensor tube connections are tight… Read More »
NOTE: Removing the exhaust pressure sensor is only necessary if replacing the sensor or if extensive cleaning of the water outlet connection is required. For front gear train engines, remove the exhaust pressure sensor from the water outlet connection.
Remove the water outlet connection capscrews. Remove the water outlet connection. Remove the thermostat.
If the thermostat is suspected to be leaking, the following steps can be performed to check for leakage. The following check must be performed with the thermostat closed for 1 minute of engine operation. Use an electronic service tool to monitor the coolant temperature. The coolant temperature should be less than 38°C [100°F] to make… Read More »
The thermostat controls the engine coolant temperature. When the coolant temperature is below the operating range, engine coolant is bypassed back to the inlet of the water pump. When the engine coolant temperature reaches the operating range, the thermostat opens, sealing off the bypass, forcing engine coolant to flow to the radiator or the heat… Read More »
For flange mounted coolant heaters, lubricate the new heater o-ring with clean 15W-40 engine oil. Install the coolant heater and retaining capscrews. Tighten the capscrews. Torque Value: 24 N•m [ 212 in-lb ] For threaded coolant heaters, apply pipe sealant, Part Number 3375066, to the threads of the coolant heater. Install the coolant heater into… Read More »
Clean the coolant heater port thoroughly with a clean rag. Make sure there are no burrs, metal shavings, or sharp edges that can cut the a-ring. Clean the coolant heater thoroughly with a clean rag. Make sure the heating element is free of debris and buildup and the sealing area is clean. Check the coolant… Read More »
Depending on the type of cylinder block, there are two types of coolant heaters used: • A flange mounted coolant heater, located at the rear of the engine on the exhaust side. • A threaded coolant heater, located adjacent to the lubricating oil cooler. Disconnect the block heater electrical cord. For flange mounted coolant heaters,… Read More »