Pic. 2.277. Valve spring check
Using a metal square (90°), check the non-perpendicularity of the valve spring, as shown in Figure 2.277.
The maximum allowable non-perpendicularity is 2.0 mm.
Pic. 2.278. Valve Spring Length Measurement
Use a caliper to measure the free length of the spring (pic. 2.278).
The length of the valve spring is 45.50 mm.
If the spring length is out of specification, replace the valve spring.
Pic. 2.279. Measuring the degree of compression of a spring with a tester
Using a spring tester, measure the force required to compress the spring to its installation length (pic. 2.279).
The elastic force of the spring with a length of 33.8 mm is 186–206 N.
If the force is out of range, replace the valve spring.