Valve Clearance: Adjustments

Fig. 20 Valve clearance check:

Fig. 22 Valve adjustment alignment marks:

To provide a means to compensate for dimensional changes in the valve train and provide for valve adjustment, .060 inch shorter or longer pushrods are available. If the valve clearance is less than the minimum, the .060 inch shorter pushrod should be used. If the clearance is more than the maximum, the longer pushrod should be used. To check the valve clearance, proceed as follows:

1. Install auxiliary starter switch. Crank engine with ignition switch Off until No. 1 piston is on TDC after compression stroke.
2. Slowly supply pressure to bleed down tappet until plunger is completely bottomed against tappet bleed down wrench tool No. T70P-6513-A or equivalent, Fig. 20.
3. Hold tappet in position and check clearance between rocker arm and valve stem tip with suitable feeler gauge.
4. If clearance is less than specifications, install shorter push rod.
5. If clearance is greater than specifications, install longer push rod.
6. Turn crankshaft to number 1 location, Fig. 22, then compress valve lifter using tappet bleed down tool T71P-6513-A or equivalent, Fig. 20, and check the clearance on the following valves:

7.5L/V8-460
No. 1 Intake
No. 1 Exhaust
No. 3 Intake
No. 4 Exhaust
No. 7 Intake
No. 5 Exhaust
No. 8 Intake
No. 8 Exhaust
4. Turn crankshaft to number 2 location, Fig. 22, then compress valve lifter using tool T71P-6513-A or equivalent, Fig. 20, and check the clearance on the following valves:

7.5L/V8-460
No. 2 Intake
No. 2 Exhaust
No. 4 Intake
No. 3 Exhaust
No. 5 Intake
No. 6 Exhaust