Valve Clearance Check

Special Tool(s) / General Equipment 

Check 

• 1.
  
  Remove the following items:
  • Refer to: Valve Cover .
  • RH only. Refer to: Fender Splash Shield .

• 2.
  
  
  NOTE: Turn the engine clockwise only, and only use the crankshaft bolt.
  NOTE: Measure the clearance of each valve at base circle, with the lobe pointed away from the tappet.

  Use a feeler gauge to measure the clearance of each valve and record its location. Use the General Equipment: Feeler Gauge

Courtesy of FORD MOTOR COMPANY

• 3.
  
  
  NOTE: The number on the valve tappet only reflects the digits that follow the decimal. For example, a tappet with the number 0.650 has the thickness of 3.650 mm.
  NOTE: Select tappets using this formula: tappet thickness = measured clearance + the existing tappet thickness - nominal clearance.
  NOTE: The nominal clearance is:
  • intake: 0.0098 in (.25 mm)
  • exhaust: 0.0142 in (.36 mm)
  NOTE: The acceptable clearances after being fully installed are:
  • intake: 0.0079-0.0118 in (.2-.3 mm)
  • exhaust: 0.0122-0.0161 in (.31-.41 mm)

  Select the closest tappet size to the ideal tappet thickness available and mark the installation location.

• 4.
  
  If any tappets do not measure within specifications, install new tappets in these locations. Refer to: Valve Tappets .