Valve Spring Dimensions And Valve Spring Pressure Load
WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
Check valve spring pressure at specified spring height.
Standard : 166 - 188 N (16.9 - 19.2 kg, 37.3 - 42.3 lb) at height 37.0 mm (1.457 in)
Limit : 378 - 426 N (38.6 - 43.5 kg, 85.0 - 95.8 lb) at height 27.8 mm (1.094 in)
If it is not within specifications, replace the spring.