F 250 4WD LD Pickup V8-281 4.6L VIN W EFI (1997)
Camshaft: Testing and Inspection
Lobe
Lobe Lift
Check the lift of each camshaft lobe in consecutive order and make a note of the readings.
1. Remove valve covers.
2. Remove spark plugs.
3. Install Dial Indicator With Bracketry so that the rounded tip of indicator is on top of camshaft lobe and on the same plane as hydraulic lash
adjuster (HLA).
4. Rotate crankshaft until base circle of camshaft lobe is reached.
5. Zero the dial indicator. Continue to rotate crankshaft until (A) high-lift point of camshaft lobe is in fully-raised position (highest indicator reading).
6. To check accuracy of original indicator reading, continue to rotate crankshaft until (B) base circle is reached. The indicator reading should be
zero. If zero reading is not obtained, repeat Steps 1 through 6.
7. Compare total lift recorded on dial indicator with specifications.
NOTE: If lift on any lobe is below specified service limits, the camshaft roller followers operating on that camshaft must be replaced.
8. Remove Dial Indicator With Bracketry.
9. Install spark plugs.
10. Install valve covers.
Lobe Surface
Inspect camshaft lobes for pitting or damage in the active area. Minor pitting is acceptable outside the active area.
