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Valve Spring Dimensions And Valve Spring Pressure Load

WARNING: This page is about a different car, the 2004 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.

  1. Standard: 166 - 188 N (16.9 - 19.2 kg, 37.3 - 42.3 Ib.) at height 37.0 mm (1.457 in) 
  2. Limit: 378 - 426 N (38.6 - 43.5 kg, 85.0 - 95.8 Ib.) at height 27.8 mm (1.094 in) 

If it is not within specifications, replace the spring.

Fig 1: Checking Valve Spring Pressure At Specified Spring Height
G00779328Courtesy of NISSAN MOTOR CO., U.S.A.