Valve Spring

WARNING: This page is about a different car, the 2003 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Measure the free height of the spring. If it is less than the limit, replace.
1. Standard value: 51.0 mm (2.00 inches)
2. Minimum limit: 50.0 mm (1.97 inches)
Fig 1: Measuring Free Height And Squareness Of Spring
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Measure the squareness of the spring. It if exceeds the limit, replace.
1. Standard value: 2 degree angle or less
2. Limit: 4 degree angle