Adjusting Valve Clearance: 1968-69

Positive stop rocker arm stud eliminates the necessity of adjusting valve lash. To obtain correct valve lash it is necessary that all valve components be in good condition, and installed and torqued correctly. This condition may be obtained by the following procedure:

1. Position #1 piston at TDC on compression stroke using TDC timing mark and pointer on crankshaft damper as reference point "A".
2. Make three chalk marks on damper circumference so that damper is marked at increments of 90° from point "A". This gives four reference points on the damper with points "B", "C" and "D" in counterclockwise sequence from point "A".
3. With damper at "A" back stud nut off two turns on intake and exhaust valves of #1 cylinder. Then torque stud nuts to specification.
4. Rotate crankshaft clockwise in successive 1/2 turn increments stopping at points "B", "C", "D" and performing stud nut operation described in 3). Check all stud nuts as follows (two complete turns of crankshaft required):

   First Turn	Second Turn
   At A  check #1 cylinder	At A  check #6 cylinder
   At B  check #3 cylinder	At B  check #5 cylinder
   At C  check #7 cylinder	At C  check #4 cylinder
   At D  check #2 cylinder	At D  check #8 cylinder

   Fig 1: 1968-69 Positions For Checking Valve Clearance

   Courtesy of FORD MOTOR CO.