Check the belt for oil or dust deposits. Replace, if necessary. Small deposits should be wiped away with a dry cloth or paper. Do not clean with solvent.

When the engine is overhauled or belt tension adjusted, carefully check the belt. If any of the following flaws are evident, replace the belt.

Description	Flaw conditions
1. Hardened back suface Back suface glossy. Non-elastic and so hard that when your fingernail is pressed into it, no mark is produced.
2. Cracked back surface rubber
3. Cracked or separating canvas
4. Badly worn teety (initial stage) Canvas on load side tooth flank worn (Fluffy canvas fibers, rubber gone and color changed to white, and unclear canvas texture)
5. Badly worn teeth (last stage) Canvas on load side tooth flank worn down and rubber exposed (tooth width reduced)
6. Cracked tooth bottom
7. Missing tooth
8. Side of belt badly worn note A normal belt should have precisely cut sides as if cut by a sharp knife.
9. Side of belt cracked

Check the camshaft sprocket, crankshaft sprocket, tensioner pulley, and idler pulley for abnormal wear, cracks, or damage. Replace as necessary.

Inspect the tensioner pulley and the idler pulley for easy and smooth pulley rotation and check for play or noise. Replace as necessary.