Mechanical Inspection: Compression
Check engine mechanical condition using a compression gauge, vacuum gauge or an engine analyzer. If using an engine analyzer, see engine analyzer manual for specific instructions. For specifications, see appropriate COMPRESSION SPECIFICATIONS table.
4-CYLINDER COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| Altima & Frontier | 9.2:1 | ||
| Sentra | |||
| 1.6L | 9.9:1 | ||
| 2.0L | 9.5:1 | ||
| Normal Compression Pressure | |||
| Altima & Frontier | 178 psi (1226 kPa) | ||
| Sentra | |||
| 1.6L | 199 psi (1373 kPa) | ||
| 2.0L | 178 psi (1226 kPa) | ||
| Minimum Compression Pressure | |||
| Altima & Frontier | 149 psi (1030 kPa) | ||
| Sentra | |||
| 1.6L | 171 psi (1177 kPa) | ||
| 2.0L | 149 psi (1030 kPa) | ||
| Maximum Variation Between Cylinders | |||
| All Models | 14 psi (98 kPa) | ||
V6 COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| Frontier, Pathfinder, Quest & QX4 | 8.9:1 | |
| Maxima | 10.0:1 | |
| Normal Compression Pressure | ||
| Frontier, Pathfinder, Quest & QX4 | 173 psi (1196 kPa) | |
| Maxima | 185 psi (1275 kPa) | |
| Minimum Compression Pressure | ||
| Frontier, Pathfinder, Quest & QX4 | 128 psi (883 kPa) | |
| Maxima | 142 psi (981 kPa) | |
| Maximum Variation Between Cylinders | ||
| All Models | 14 psi (98 kPa) | |