INSPECTION


TIMING BELTS
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 fingernails.

2.Cracked back surface rubber.
3.Cracked or separated canvas.
4.Cracked tooth bottom.
5.Cracked side.

6.Abnormal wear on side.
note Normal belt should have clear-cut sides as if cut by a sharp knife.

7.Abnormal wear in teeth.

    Initial stage:
    Canvas on load side tooth flank worn (Fluffy canvas fibres, rubber gone and colour changed to white, and unclear canvas texture)
    Last stage:
    Canvas on load side tooth flank worn down and rubber exposed (tooth width reduced)
8.Missing tooth.

AUTO-TENSIONER
1.Check the auto-tensioner for leaks from the sealed sections.
Replace it if leaky.
2.Check the rod end for wear and other damage.
Replace the auto-tensioner if the rod is badly worn or damaged.

3.Measure the extension length of the rod.
If it is not within the standard value range, replace the auto-tensioner.
Standard value: 14.5 mm
4.Measure the amount of the retraction when the rod is pressed with the force of 100 - 200 N. If it deviates from the standard value, replace the auto-tensioner.
Standard value: Less than 1 mm

AIR BLEEDING PROCEDURE OF AUTO-TENSIONER
caution To prevent the air from being incorporated, keep the auto-tensioner with its rod upward after the air bleeding. Do not keep the auto-tensioner with 60° or more tilt.
When the auto-tensioner is not kept with its rod upward, or when a wire or pin having Φ2 mm is pulled out before the installation to the engine, carry out the air bleeding as follows.

1.
caution
  • If a horizontal press such as a vice is used, the air entrainment may occur. Thus, a vertical press must be used.
  • If the compression is too fast, the procedure may damage the rod. Make sure to compress slowly and thoroughly.
  • To prevent damage to the auto-tensioner, do not apply the load of 5,000 N or more.
  • To prevent a damage to the auto tensioner, do not push down the rod exceeding the bottom end (a position where the rod protrusion is at 0.5 mm from the auto tensioner).
Set the auto-tensioner to a vertical press as shown in the illustration.
2.Slowly press down the rod, two or three times, to the cylinder end plane.
3.When the rod protrusion has approximately 5 mm, apply the load of 100 - 200 N. Check whether the auto-tensioner has sufficient stiffness.
4.If the auto-tensioner does not have sufficient stiffness, replace the auto-tensioner.
5.Slowly pressing down the rod, insert a wire or pin having Φ2mm through the hole to fix the auto-tensioner.