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.
1998 Nissan-Datsun Sentra BaseFACTORY OEM SERVICE PROCEDURE
4-Cylinder Compression Specifications
4-CYLINDER COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| Altima | 9.2:1 | ||
| Frontier | 9.2:1 | ||
| Sentra & 200SX | |||
| 1.6L | 9.9:1 | ||
| 2.0L | 9.5:1 | ||
| 240SX | 9.5:1 | ||
| Normal Compression Pressure | |||
| Altima | 178 psi (12.5 kg/cm2 ) | ||
| Frontier | 178 psi (12.5 kg/cm2 ) | ||
| Sentra & 200SX | |||
| 1.6L | 199 psi (14.0 kg/cm2 ) | ||
| 2.0L | 178 psi (12.5 kg/cm2 ) | ||
| 240SX | 178 psi (12.5 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| Altima | 149 psi (10.5 kg/cm2 ) | ||
| Frontier | 149 psi (10.5 kg/cm2 ) | ||
| Sentra & 200SX | |||
| 1.6L | 171 psi (12.0 kg/cm2 ) | ||
| 2.0L | 149 psi (10.5 kg/cm2 ) | ||
| 240SX | 151 psi (10.6 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | 14 psi (1.0 kg/cm2 ) | ||
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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