Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine mechanical (EM)
Compression pressure

Inspection

  1. Warm up engine and then turn it off.
  2. Release fuel pressure.
  3. Remove ignition coil and spark plug from each cylinder.
  4. Connect engine tachometer (not required in use of CONSULT).
  5. Install compression gauge (B) with an adapter (A) (commercial service tool) onto spark plug hole.

Compression pressure

  • Use an adapter with a diameter (a) smaller than 20 mm (0.79 in). Otherwise, it may be caught by cylinder head during removal.

(a) : Less than 20 mm (0.79 in)

Compression pressure

  1. With accelerator pedal fully depressed, turn ignition switch to START for cranking. When the gauge pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each cylinder.

CAUTION:

Always use a fully charged battery to obtain the specified engine speed.

  • If the engine speed is out of the specified range, check the battery. Check the engine speed again with a fully charged battery.
  • If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug hole to recheck the compression.
  • If the added engine oil improves the compression, the piston rings may be worn or damaged. Check the piston rings and replace if necessary.
  • If the compression pressure remains low despite the addition of engine oil, the valves may be malfunctioning. Check the valves for damage. Replace the valve or valve seat as necessary.
  • If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil the head gasket may be leaking, or valves in adjacent cylinders may be damaged. Inspect and repair as required.
  • If the compression pressure is below the minimum value, check the valve clearances and parts associated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After repairing, measure the compression pressure again.
  1. After inspection is completed, install removed parts.
  2. Start the engine, and ensure that the engine runs smoothly.
  3. Perform trouble diagnosis. If DTC appears, erase it.
    More about «Engine mechanical (EM)»:

    Precautions

    Preparation

    Camshaft valve clearance

    Compression pressure

    Noise, vibration and harshness (NVH) troubleshooting

    Drive belt

    Air cleaner filter 

    Spark plug

    Drive belt idler pulley

    Air cleaner and air duct

    Intake manifold

    Exhaust manifold

    Oil pan (lower)

    Fuel injector and fuel tube

    Ignition coil, spark plug and rocker cover

    Timing chain

    Camshaft

    Valve oil seal

    Front oil seal

    Rear oil seal

    Cylinder head

    Engine assembly

    Engine stand setting

    Oil pan (upper) and oil strainer

    Cylinder block

    How to select piston and bearing

    Service data and specifications (sds)

    Nissan Versa Sedan Service Manual / Engine / Engine mechanical (EM) / Compression pressure

    Nissan Versa Sedan Service Manual

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