Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Valve Spring Free Length and Preload
- 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)
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.