Valve Spring: Service and Repair

Valve spring wire diameter:
Inner 0.104 in
Outer 0.128 in

Inside diameter
Inner 0.636 in
Outer 0.872 in

Total No. of coils
Inner 6
Outer 5

Free length
Inner 1.734 in
Outer 2.103 in

Helix Right hand

Checking Spring Length:

To test against a new valve spring, insert both valve springs end to end between the test equipment. Apply a load to partly compress the springs and measure their comparative lengths.

Note: 'A' is the old spring.

If the distance at 'A' is smaller than the distance at 'B', then 'A' must be replaced.

Checking Spring For Distortion:

Spring distortion is determined by positioning the spring upright on a surface plate and checking the squareness of each end with a set square. All valve springs which have diminished in length and/or are not square must be discarded and replacements fitted.