Cause 
 | Correction 
 | 
 Worn, damaged or loose rocker arm 
 | 
|     •  | Inspect the valve rocker arms. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 | 
 Worn,
damaged, loose or bent valve push rod 
 | 
|     •  | Inspect the valve push rods. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 | 
Worn,
damaged or stuck valve, carbon on the valve stem or valve seat 
 | 
|     •  | Inspect the valve guides. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 | 
Worn,
damaged or dirty valve lifter 
 | 
|     •  | Inspect the valve lifters. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 | 
Worn
or damaged camshaft lobe 
 | 
|     •  | Inspect the valve lifters. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 | 
Worn,
damaged or loose timing chain and sprockets 
 | 
|     •  | Inspect the timing chain and sprockets. |  
  
|     •  | Repair or replace damaged components as required. |  
  
 |