Valve Spring Strength

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

SPECIAL TOOL CHART

Valve/Clutch Spring Tester 303-006 (TOOL-6513-DD) or equivalent

Use a spring tester to check the valve spring for correct strength at the specified valve spring length.
- For additional information, refer to Specifications in the appropriate ENGINE article.
- If out of specification, install new components as necessary. Refer to the appropriate ENGINE article for the procedure.
  
  Fig 1: Measuring Valve Spring Strength
  Courtesy of FORD MOTOR CO.