Checking Valve Strength

Use a Valve/Clutch Spring Pressure Gauge to check the valve spring for correct strength at the specified valve spring length.
- Refer to ENGINE - 3.9L AND 4.2L article for the procedure.
- If out of specification, install new components as necessary. Refer to ENGINE - 3.9L AND 4.2L article for the procedure.

Fig 1: Measuring Valve Spring Strength

Courtesy of FORD MOTOR CO.