Valve Spring Dimensions And Valve Spring Pressure Load

Check valve spring pressure at specified spring height.

1. Standard : 196 N (20.0 kg, 44.1 lb) at height 37.0 mm (1.457 in) 
2. 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.