Pathfinder LE 2WD V6-3.3L (VG33E) (1999)
Compression Check: Testing and Inspection
To VIN # 350000
1. Warm up engine.
2. Turn ignition switch off.
3. Release fuel pressure.
4. Remove all spark plugs.
5. Disconnect distributor center cable.
6. Attach a compression tester to No. 1 cylinder.
7. Depress accelerator pedal fully to keep throttle valve wide open.
8. Crank engine and record highest gauge indication.
9. Repeat the measurement on each cylinder as shown above.
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Always use a fully-charged battery to obtain specified engine speed.
Compression pressure: kPa (kg/cm2, psi)/300 rpm
Standard: 1,196 (12.2, 173)
Minimum: 883 (9.0, 128)
Difference limit between cylinders: 98 (1.0, 14)
10. If cylinder compression in one or more cylinders is low, pour a small amount of engine oil into cylinders through spark plug holes and retest
compression.
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If adding oil improves cylinder compression, piston rings may be worn or damaged. If so, replace piston rings after checking piston.
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If pressure stays low, a valve may be sticking or seating improperly. Inspect and repair valve and valve seat. If valve or valve seat is damaged
excessively, replace them.
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If compression in any two adjacent cylinders is low and if adding oil does not improve compression, there is leakage past the gasket surface. If
so, replace cylinder head gasket.