Faulty Coolant Pump
To determine if a faulty coolant pump is causing high engine coolant temperature, perform the following:
- Remove the coolant pump and inspect pump for failed shaft or rotor; refer to MBE 4000 Service Manual (6SE420), Chapter 4, “Cooling System — Coolant Pump”.
- Replace coolant pump if damaged; refer to MBE 4000 Service Manual (6SE420), Chapter 4, “Cooling System — Coolant Pump”.
Test Engine with Replaced coolant pump
Perform the following steps to determine if thermo-modulated fan replacement resolved high engine coolant temperature:
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.
- Start and run the engine.
- Run the engine through its operating range with no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
- If the engine coolant temperature is 82-105°C (180-221°F), no further troubleshooting is required. Shut down the engine.
- If the engine coolant temperature is not 82-105°C (180-221°F), shut down the engine. Check combustion gases in coolant; refer to "14.9 Combustion Gases in Coolant" .
|EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568|
|Generated on 10-13-2008|