Procedures

INSPECTION

Timing Belt

NOTE: The timing belts must be checked closely. Should the following defects be evident, replace the belt with a new one.




(1) Hardened back surface rubber, glossy, non-elastic, and so hard that no mark is produced even when scratched by a fingernail.




(2) Cracked back surface rubber.




(3) Cracked or separated canvas.
(4) Cracked tooth bottom.
(5) Cracked side of belt.
(6) Abnormal wear on side.

NOTE: A normal belt should have clear-cut sides as if cut with a sharp knife.




(7) Abnormal wear on teeth.

Initial stage: Canvas on load side tooth flank worn (fluffy canvas fibers, rubber gone and color changed to white, and unclear canvas texture).

Last stage: Canvas on load side flank worn down and rubber exposed (tooth width reduced).

(8) Missing tooth

Tensioner Pulley




Turn the pulleys to check for possible binding, excessive play and unusual noise. Replace the pulley if any of these defects is evident.