Timing Belt Tensioner: Service and Repair

INSPECTION

TIMING BELT TENSIONER ADJUSTER CHECK

1. Check for oil leak from seal, and replace it if a leak is detected.

2. Check for wear or damage at the top of the rod. Replace it, if required.





3. Hold the timing belt tensioner adjuster by hand, and press the top end of the rod onto the metal (e.g. cylinder block) with 98 - 196 N (22 - 44 pounds) of pressure, and measure the movement of the rod.
Standard value: Within 1 mm (0.039 inch)

A: Length when it is free (not pressed)
B: Length when it is pressed
A - B: Movement
4. If the measured value is out of the standard value, replace the timing belt tensioner adjuster.

BALANCER TIMING BELT TENSION CHECK

Required Special Tools:

- MB992080: Belt Tension Meter Set
- MB992081: Belt Tension Meter
- MB992082: Microphone Assembly

CAUTION:

- When measuring the tension, make sure that the engine is cold.
- Measure the tension after turning the crankshaft clockwise two turns or more.

Check the balancer timing belt tension in the following procedures.





1. With your finger tip lightly tap the center of the balancer timing belt between the sprockets in the location shown by the arrow in the illustration, then check whether the belt vibration frequency is within the standard value.
NOTE:
Refer to auto-tensioner check Testing and Inspection, for information regarding the vibration frequency measurement method using special tool MB992080.

Standard value: 70 - 100 Hz






2. Apply a pressure of 59 N (13 pounds) at the center (arrow area) between the sprocket as shown in the figure, then check whether the belt deflection is within the standard value.
Standard value: 8 - 12 mm (0.31 - 0.47 inch)
3. If not within the standard value, adjust the belt tension. (Refer to Service and Repair).