Series 50 – Section 27.5 Fan Belts Are Incorrectly Adjusted

Section 27.5
Fan Belts Are Incorrectly Adjusted

To determine if misadjusted fan belts are causing high engine coolant temperature, perform the following: ‪

1. Test fan belt(s) tension; refer to "13.5.7 Drive Belts" .
2. Compare tension to belt specifications listed in Table "Fan Belt Tension" .

   Single Belt ‪	2 or 3 Belts ‪
   80-100 lbs (356-445 N)‪	60-80 lbs (267-356 N)‪

   Table 1. Fan Belt Tension
   1. If the belt(s) tension is within specification, check the thermo-modulated fan; refer to "27.6 Inoperative Thermo-Modulated Fan" .
   2. If the belt(s) tension is not within specification, refer to "27.5.1 Belt Tension Resolution" .

Section 27.5.1
Belt Tension Resolution

Perform the following steps to resolve incorrect belt tension:‪

1. Readjust belt(s) tension as necessary; refer to "13.5.7 Drive Belts" .
2. Verify belt tension resolution; refer to "27.5.1.1 Test Engine with Correct Belt Tension" .

Section 27.5.1.1
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.
   1. If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required. Shut the engine down.
   2. If the engine coolant temperature is not 88-96°C (190-210°F), shut the engine down. Check thermo-modulated fan; refer to "27.6 Inoperative Thermo-Modulated Fan" .