July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Valve Spring

Measure free length and outer diameter of each valve spring. Also check for damage or deformation.
Inspection standard:

Refer to SDS, LINE PRESSURE .
Replace valve springs if deformed or fatigued.

Fig 1: Measuring Free Length And Outer Diameter Of Valve Spring

Courtesy of NISSAN MOTOR CO., U.S.A.