Valve Spring Free Length and Preload
WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
- Check each valve springs for breakage or weakening.
- Measure valve spring free length and preload.
If measured value is less than limit, replace valve spring.
NOTE: Weakened valve springs can cause chatter, not to mention possibility of reducing power output due to gas leakage caused by decreased seating pressure.
Valve spring free length "a"
Standard: 51.34 mm (2.021 in.)
Limit: 50.34 mm (1.981 in.)
Valve spring preload when compressed to 41 mm (1.61 in.)
Standard: 170 - 196 N (17.4 kgf - 19.9 kgf, 38.3 lbf - 44.0 lbf)
Limit: 165 N (16.9 kgf, 37.1 lbf)
Valve spring preload when compressed to 31.2 mm (1.23 in.)
Standard: 379 - 437 N (38.7 - 44.5 kgf, 85.2 - 98.2 lbf)
Limit: 375 N (38.3 kgf, 84.3 lbf)