Testing and Inspection for Timing Belt on 1988 Pickup 2WD L4-23L (4ZD1)
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Tension pulley outside diameter
1. Check the roller for excessive wear and damage.
2. Check to see that the roller rotates smoothly.
3. Check to see that there is no play in the pulley shaft/fixing plate sealing area.
Tension spring tension
If the set length or set force is out of the specified range, replace the tension spring with a new one.