Valve Tappet Inspection

Push rod engines 

Inspect the hydraulic valve tappet and roller for damage. If any damage is found, inspect the camshaft lobes and valves for damage.

Fig 1: Inspecting Hydraulic Valve Tappet And Roller For Damage

Courtesy of FORD MOTOR CO.

OHC engines 

Fig 2: Identifying Roller Follower/Valve Tappet

Courtesy of FORD MOTOR CO.