F 550 4WD Super Duty V8-6.4L DSL Turbo (2008)
Valve Spring: Service and Repair
Valve Spring Squareness
1. Clean all valve springs in a suitable solvent.
2. Inspect valve springs for rust, pitting, distortion and cracks. If any of these conditions exist, install new valve springs.
3. Verify that the spring ends are flat and square to prevent lateral loads on the valve stem. Install new valve springs as necessary.
Valve Spring Free Length
1. Clean all valve springs in a suitable solvent.
2. Inspect valve springs for rust, pitting, distortion and cracks. If any of these conditions exist, install new valve springs.
3. Measure the valve spring tension by using a valve spring tester. Measure the valve spring free length.
4. Apply the appropriate test load to each spring and determine whether the test length is achieved.
