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 BLOCK ASSEMBLYPISTON RING, ENGINE
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)
Piston Ring, Engine
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)SECTION Piston Ring, Engine
Piston Ring
Side clearance
Top
Standard 0.045 - 0.080 mm (0.0018 - 0.0031 in.)
Limit 0.11 mm (0.0043 in.)
2nd
Standard 0.030 - 0.070 mm (0.0012 - 0.0028 in.)
Limit 0.10 mm (0.004 in.)
Oil ring 0.065 - 0.135 mm (0.0026 - 0.0053 in.)
End gap
Top
Standard 0.21 - 0.31 mm (0.0083 - 0.0122 in.)
Limit 0.54 mm (0.0213 in.)
2nd
Standard 0.32 - 0.47 mm (0.0126 - 0.0185 in.)
Limit 0.67 mm (0.0264 in.)
Oil (rail ring)
Standard 0.20 - 0.60 mm (0.0079 - 0.0236 in.)
Limit 0.95 mm (0.0374 in.)
Side clearance
Top
Standard 0.045 - 0.080 mm (0.0018 - 0.0031 in.)
Limit 0.11 mm (0.0043 in.)
2nd
Standard 0.030 - 0.070 mm (0.0012 - 0.0028 in.)
Limit 0.10 mm (0.004 in.)
Oil ring 0.065 - 0.135 mm (0.0026 - 0.0053 in.)
End gap
Top
Standard 0.21 - 0.31 mm (0.0083 - 0.0122 in.)
Limit 0.54 mm (0.0213 in.)
2nd
Standard 0.32 - 0.47 mm (0.0126 - 0.0185 in.)
Limit 0.67 mm (0.0264 in.)
Oil (rail ring)
Standard 0.20 - 0.60 mm (0.0079 - 0.0236 in.)
Limit 0.95 mm (0.0374 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.