Special Tool(s) / General Equipment

Feeler Gauge

1. Remove the following items:
   • Valve cover.

     Refer to: Valve Cover  .

   • RH fender splash shield.

     Refer to: FENDER SPLASH SHIELD .

NOTE: Turn the engine clockwise only, and only use the crankshaft bolt.
NOTE: Before removing the camshafts, measure the clearance of each valve at base circle, with the lobe pointed away from the tappet. Failure to measure all clearances prior to removing the camshafts will necessitate repeated removal and installation and wasted labor time.
Fig 1: Measuring Clearance Of Valve Using Feeler Gauge
Courtesy of FORD MOTOR CO.
2. Use a feeler gauge to measure the clearance of each valve and record its location.

   General Equipment  : Feeler Gauge

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: 0.25 mm (0.0095 in).
• exhaust: 0.36 mm (0.0142 in).
NOTE: The acceptable clearances after being fully installed are:
• intake: 0.19-0.31 mm (0.007-0.012 in).
• exhaust: 0.30-0.42 mm (0.012-0.017 in).
3. 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  .