Valve Clearance, 5.0L (302 CID) MFI V-8 Engine

The valve arrangement of the left bank is E-I-E-I-E-I-E-I and on the right bank is I-E-I-E-I-E-I-E.

A 1.52mm (0.060 inch) shorter push rod (6565) or a 1.52mm (0.060 inch) longer push rod is available for service to provide a means of compensating for dimensional changes in the valve mechanism. Refer to the Master Parts List for the appropriate color code.

Valve stem-to-valve rocker arm clearance should be within specifications with the hydraulic valve tappet (6500) completely collapsed. Repeated valve reconditioning operations (valve and/or valve seat refacing) will decrease the clearance to the point that if it is not compensated for, the hydraulic valve tappet will cease to function and the valve will be held open.

The positive stop rocker arm bolts eliminate the necessity to adjust the valve clearance. However, to obtain the specified valve clearance, it is important that all valve components be in a serviceable condition and installed and tightened properly.

To determine whether a shorter or a longer push rod is necessary, make the following check.

1. Disconnect the brown lead (I terminal) and the red and blue lead (S terminal) at the starter relay.

2. Install an auxiliary starter switch between the battery and S terminal of the starter relay. Crank the engine (6007) with the ignition switch in off position until the No. 1 piston (6108) is on TDC after the compression stroke.

3. Position the tappet compressor tool, Tappet Bleed Down Wrench T71P-6513-B on the rocker arm (6564) with the crankshaft (6303) in the positions designated in Steps 4, 5 and 6.

   Slowly apply pressure to bleed down the valve tappet until the plunger is completely bottomed. Hold the valve tappet in this position and check the available clearance between the rocker arm and the valve stem tip with a feeler gauge.

   If the clearance is less than specifications, install a shorter push rod. If the clearance is greater than specifications, install a longer push rod.

   

4. With the No. 1 piston on TDC at the end of the compression stroke, POSITION 1, check the following valves:

   No. 1 Intake No. 1 Exhaust

   No. 4 Intake No. 3 Exhaust

   No. 8 Intake No. 7 Exhaust

   

5. Rotate the crankshaft to POSITION 2 and check the following valves:

   No. 3 Intake No. 2 Exhaust

   No. 7 Intake No. 6 Exhaust

6. Rotate the crankshaft to POSITION 3 and check the following valves:

   No. 2 Intake No. 4 Exhaust

   No. 5 Intake No. 5 Exhaust

   No. 6 Intake No. 8 Exhaust