Valve Spring Inspection

CAUTION:

The valve springs differ depending on the IN and EX sides/Therefore, verify the free length or identification paint beforehand and inspect the valve springs.

Fig 1: Identifying Valve Springs Free Length

G00575907

Courtesy of MAZDA MOTORS CORP.

Measure the valve spring height using the spring tester.
- If it is not within the specification, replace the valve spring.
Valve spring installation height

When pressurized with spring force of 228-252 N {23.3-25.6 kgf, 51.3-56.6 lbf}, spring height is 38.0 mm {1.50 in}

Fig 2: Measuring Valve Spring Height Using Spring Tester
Courtesy of MAZDA MOTORS CORP.
Measure the amount of off-square on the valve spring using a square.
1. Rotate the valve spring one full turn and measure A at the point where the gap is the largest.
  - If it exceeds the maximum specification, replace the valve spring.
  Maximum valve spring off-square
  
  IN: 2.0° (1.7 mm {0.067 in})
  
  EX: 2.0° (1.7 mm {0.067 in})
  
  Fig 3: Measuring Valve Spring Off-Square
  Courtesy of MAZDA MOTORS CORP.