Engine Controls - Adjustments - 4.6L: Diagnosis Ford Econoline E350

Valve Clearance Inspection

Note. Valve clearance is not adjustable. A valve tappet provides automatic lash adjustment. Check collapsed valve lash adjuster clearance to isolate worn components.

1. Rotate camshaft so base circle of camshaft lobe is positioned on valve to be checked. Using valve spring compressor, apply pressure on cam follower until lash adjuster is fully collapsed.
2. While holding lash adjuster fully collapsed, use feeler gauge to measure clearance between base circle of camshaft and camshaft follower. Record measurement and compare it to specification in COLLAPSED VALVE LASH ADJUSTER CLEARANCE table.
3. If clearance is not within specification, inspect camshaft follower for damage. If camshaft follower is not damaged, check for sticking valve and worn valve spring or camshaft lobe(s). If components are okay, check for defective lash adjuster. Replace components if necessary.

COLLAPSED VALVE LASH ADJUSTER CLEARANCE