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" .


Series 50 Service Manual - 6SE50
Generated on 10-13-2008

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