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Toyota 4Runner Drive Belt Noise Creates Driver Tension

Some Toyota 4Runner drivers may complain of a “squealing” or “chirping” sound from the accessory drive belt when the engine is first started. An improved auto tensioner assembly, flange bolt, V-rib belt and service procedure have been developed to correct the condition.

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Applicable Vehicles: 2003 4Runner vehicles with the 1GR-FE engine. With 4Runner vehicles before engine number 1GR-0053092 and before the VINs shown below, proceed to step 1.
• JTEZU17R030013188; and
• JTEBU14R830014935.
With 4Runner vehicles after engine number 1GR-0053092 and after the VINs shown below, go to step 7.
• JTEZU14R938006844; and
• JTEBU14R638007466.
Parts Information:

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Required Tools & Material:
• Metric socket set and basic hand tools; and
• Straightedge and metric ruler with mm.
Repair Procedure:
Note: Review safety procedures in ALLDATA Repair before beginning.
1. Check the engine number. If the engine number is higher than 1GR-0053092, go to step 7 (refer to the VIN Information). Otherwise, continue with step 2.

2. Remove the accessory drive belt and remove the alternator from the vehicle using factory and/or industry standard-approved practices.

3. Remove the A/C compressor from the auto tensioner assembly using factory and/or industry standard-approved practices and carefully move the A/C compressor to the side to allow access to the five bolts holding the auto tensioner assembly to the engine block. Pay close attention to all wire harnesses, connectors and A/C lines. It’s not necessary to disconnect any A/C lines to perform this procedure.

4. Remove the five bolts holding the auto tensioner assembly to the engine block and remove the auto tensioner assembly from the engine.

figure 2

5. Install the new auto tensioner with the new flange bolt in Position 1 and one of the previously removed bolts in Position 2 as shown in Fig. 2. Install the two bolts finger-tight. First torque the flange bolt in Position 1 to 27 ft.-lbs., then torque the bolt in Position 2 to 27 ft.-lbs. Lastly, tighten the other three bolts to 27 ft.-lbs.

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6. Reinstall the A/C compressor and alternator, then install the new V-rib belt, ensuring that the belt is properly installed. See Fig. 3.

figure 3

7. If the VIN information above refers to step 7, replace the V-rib belt before proceeding with step 8.

8. Start the engine and allow it to run for at least 10 seconds under the following conditions: A/C switch is in the off position and do not turn the steering wheel to prevent load on the power steering pump; and engine temperature should be warm and engine speed should be kept below 1,000 rpm.

9. Using the diagram below, with the engine off, hold a straightedge flat against the face of the crank pulley. Next, take the metric ruler and measure the distance from the straightedge to the side of the V-rib belt. The target specification is 8.5-10.5 mm. If the measurement is within the target, go to step 11. If the measurement is less than the target measurement, go to step 10.

10. Remove the V-rib belt and auto tensioner pulley and insert a 0.5 mm shim in the location indicated in Fig. 4. Only one shim should be inserted at a time; total thickness of the shim must be 2.0 mm or less.

Figure 4

Note: The pulley bolt is a left-hand threaded bolt.

Hint: Reinstall the pulley and torque the pulley bolt to 40 ft.-lbs. Reinstall the V-rib belt and perform steps 8 and 9 again.
If the measurement value is less than the target specification, replace the shim in the following order: 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm.

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11. Start the engine and let the engine idle for 10 minutes to confirm the repair effectiveness.

Written by ALLDATA Editor Chris Burton and ALLDATA Technical Writer Jeff Webster.

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