Valve Clearance Adjustment: Check
- After removing valve covers, rotate crankshaft until No. 1 piston is at TDC after compression stroke, as indicated by timing mark on crankshaft damper and pointer. See position "1" in Fig 1
.
- Use the CLOSED VALVE TABLE
to identify which valves can be checked with the crankshaft in this position. Select a valve on the table. Position a lifter compression tool on the rocker arm and slowly apply pressure until the plunger is completely bottomed.
- Hold the lifter in this position and check the available clearance between the rocker arm and the valve stem tip with a feeler gauge. Refer to either VALVE CLEARANCE LIMITS (STANDARD)
or refer to VALVE CLEARANCE LIMITS (HIGH OUTPUT)
table. If clearance is less than specified, install shorter push rod. If clearance is greater than specified, install longer push rod. Repeat steps 2-3 with the remaining valves.
- Rotate crankshaft 360 degrees clockwise from position "1" so point "2" is opposite pointer. See Fig 1
. Repeat steps 2-3 for position "2".
- Rotate crankshaft 90 degrees clockwise from point "2" so point "3" is opposite pointer. See Fig 1
. Repeat steps 2-3 for position "2".
CLOSED VALVE
| Dimension & Engine |
Check Valve On Cylinder # |
| Position "1" |
| 5.0L |
| Intake |
Nos. 1, 7 and 8. |
| Exhaust |
Nos. 1, 5 and 4. |
| 5.0L HO |
| Intake |
Nos. 1, 4 and 8. |
| Exhaust |
Nos. 1, 3 and 7. |
| Position "2" |
| 5.0L |
| Intake |
Nos. 4 and 5. |
| Exhaust |
Nos. 2 and 6. |
| 5.0L HO |
| Intake |
Nos. 3 and 7. |
| Exhaust |
Nos. 2 and 6. |
| Position "3" |
| 5.0L |
| Intake |
Nos. 2, 3 and 6. |
| Exhaust |
Nos. 3, 7 and 8. |
| 5.0L HO |
| Intake |
Nos. 2, 5 and 6. |
| Exhaust |
Nos. 4, 5 and 8. |
VALVE CLEARANCE LIMITS (STANDARD)
| Application Allowable |
Desired In. (mm) |
| .071-.171 (1.80-4.34) |
.096-.146 (2.44-3.70) |
VALVE CLEARANCE LIMITS (HIGH OUTPUT)
| Application Allowable |
Desired In. (mm) |
| .096-.146 (2.44-3.70) |
.098-.198 (2.49-5.03) |