To determine if misadjusted fan belts are causing high engine coolant temperature, perform
the following:
1. Test fan belt(s) tension; refer to appropriate service manual, preventive maintenance
chapter.
2. Compare tension to belt specifications listed in Table 13-1.
[a] If the belt(s) tension is within specification, check the thermo-modulated fan;
refer to section 13.6.
[b] If the belt(s) tension is not within specification,refer to section 13.5.1.
| Single Belt, N (lb) | 2 or 3 Belts, N (lb) |
| 355 – 445 (80 – 100) | 266 – 355 (60 – 80) |
13.5.1
Belt Tension Resolution
Perform the following steps to resolve incorrect belt tension:
1. Readjust belt(s) tension as necessary; refer to appropriate service manual, preventive
maintenance chapter.
2. Verify belt tension resolution; refer to section 13.5.1.1.
13.5.1.1
Test Engine with Correct Belt Tension
Perform the following to determine if exterior radiator repair resolved high engine coolant
temperature:
1. Start and run the engine.
2. Run the engine through its operating range with no-load for approximately 5 minutes,
allowing the engine coolant to reach normal operating range.
[a] If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required. Shut down the engine.
[b] If the engine coolant temperature is not 88-96°C (190-210°F), shut down the engine. Check thermo-modulated fan; refer to section 13.6.
