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.
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HOMESERVICE MANUALSNISSAN-DATSUN2004SENTRA L4-2.5L (QR25DE)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYVALVE SPRING
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)
Valve Spring
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)SECTION Valve Spring
Valve Spring
Free height standard
Intake (blue) 44.84 - 45.34 mm (1.7654 - 1.7850 in.)
Exhaust (yellow) 45.28 - 45.78 mm (1.7827 - 1.8024 in.)
Out-of-square 1.9 mm (0.0748 in.)
Installation height
Intake (blue) and Exhaust (yellow) 35.30 mm (1.390 in.)
Height during valve open
Intake (blue) 24.94 mm (0.9819 in.)
Exhaust (yellow) 26.39 mm (1.0390 in.)
Free height standard
Intake (blue) 44.84 - 45.34 mm (1.7654 - 1.7850 in.)
Exhaust (yellow) 45.28 - 45.78 mm (1.7827 - 1.8024 in.)
Out-of-square 1.9 mm (0.0748 in.)
Installation height
Intake (blue) and Exhaust (yellow) 35.30 mm (1.390 in.)
Height during valve open
Intake (blue) 24.94 mm (0.9819 in.)
Exhaust (yellow) 26.39 mm (1.0390 in.)
RENDER: 1.0x
NO RELATED
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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.