Valve Spring Dimensions And Valve Spring Pressure Load

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

Check valve spring pressure at specified spring height.

Standard : 196 N (20.0 kg, 44.1 lb) at height 37.0 mm (1.457 in)
Limit : More than 433 N (44.2 kg, 97.3 lb) at height 27.8 mm (1.094 in)

If it is not within specifications, replace the spring.

Fig 1: Checking Valve Spring Dimensions & Valve Spring Pressure Load

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