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.
2008 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE
Valve Spring
VALVE SPRING SPECIFICATIONS
| Specifications | Intake | Exhaust |
|---|---|---|
| Identification color | Pink | Blue |
| Free height | 43.72 - 43.92 mm (1.7213 - 1.7291 in) | 45.29 - 45.49 mm (1.7831 - 1.7909 in) |
| Pressure standard at height 35.30 mm (1.390 in) | 151 - 175 N (15.4 - 17.8 kg-f, 34 - 39 lb-f) | 151 - 175 N (15.4 - 17.8 kg-f, 34 - 39 lb-f) |
| Squareness | 1.9 mm (0.0748 in) | 1.9 mm (0.0748 in) |
| Installation height | 35.30 mm (1.390 in) | 35.30 mm (1.390 in) |
| Installation load | 151 - 175 N (15.4 - 17.8 kg-f, 34 - 39 lb-f) | 151 - 175 N (15.4 - 17.8 kg-f, 34 - 39 lb-f) |
| Height during valve open | 25.30 mm (0.996 in) | 26.76 mm (1.0535 in) |
| Load with valve open | 351 - 394 N (35.8 - 40.2 kg-f, 79 - 89 lb-f) | 318 - 362 N (32.4 - 36.9 kg-f, 71 - 81 lb-f) |
Factory Service Tools
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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.
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