Incorrectly Adjusted Fan Belt
To determine is a misadjusted fan belt is causing high engine coolant temperature, perform the following steps:
- Check the auto tensioner for spring loading.
- Compare tension to belt specifications.
Belt Tension Resolution
Perform the following steps to resolve incorrect belt tension:
- Replace the auto tensioner as required.
- Verify belt tension resolution; refer to "188.8.131.52 Test Engine with Correct Belt Tension" .
Test Engine with Correct Belt Tension
Perform the following to determine if belt tension 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 thermo-modulated fan; refer to "14.6 Inoperative Thermo-Modulated Fan" .
|EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568|
|Generated on 10-13-2008|