Caution: Refer to Safety Glasses Caution in the Preface section.
| • | Worn or damaged hub-to-crankshaft surface (1) | 
| • | Worn, grooved or damaged hub seal surface (2) -- A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other damage must be replaced. | 
| • | Worn, chunking or deteriorated rubber between the hub and pulley (3) | 
| • | Damaged drive belt ribs (4) | 
| • | Damaged threaded holes (5) |