Nissan Juke Service and Repair Manual : Compression pressure

Inspection

1. Warm up engine thoroughly. Then, stop it.

2. Release fuel pressure. Refer to EC-551, "Work Procedure".

3. Remove ignition coil and spark plug from each cylinder. Refer to EM-53, "Exploded View".

4. Connect engine tachometer (not required in use of CONSULT-III).

5. Install compression gauge (B) with an adapter (A) (commercial service tool) onto spark plug hole.

• Use the adapter whose picking up end inserted to spark plug


• Use the adapter whose picking up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it may be caught by cylinder head during removal.

a : 20 mm (0.79 in)

6. With accelerator pedal fully depressed, turn ignition switch to “START”


6. 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.

Compression pressure : Refer to EM-129, "General Specification".

CAUTION

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

• If the engine speed is out of the specified range, check battery liquid for proper gravity. Check the engine speed again with normal battery gravity.

• If compression pressure is below minimum value, check valve clearances, and parts associated with combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, and cylinder head gasket). After the checking, measure compression pressure again.

• If some cylinder has low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to recheck it for compression.

- If the added engine oil improves the compression, piston rings may be worn out or damaged. Check piston rings and replace if necessary.

- If the compression pressure remains at low level despite the addition of engine oil, valves may be malfunctioning.

Check valves for damage. Replace valve or valve seat accordingly.

• If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cylinder head gaskets.

7. After inspection is completed, install removed parts.

8. Start the engine, and check that the engine runs smoothly.

9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-147, "Description".

    Camshaft valve clearance
    Inspection and Adjustment INSPECTION Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if there is unusual engine conditions regardin ...

    Symptom diagnosis
    NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING NVH troubleshooting Chart 1. Locate the area where noise occurs. 2. Confirm the type of noise. 3. Specify the operating condition of engine ...

    Other materials:

    Diagnosis system (BCM) (with intelligent key system)
    Description Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings using diagnosis function of each control unit. Common item : consult-III Function (BCM - COMMON ITEM) APPLICATION ITEM CONSULT-III performs the following functions via CAN ...

    Radiator : Inspection
    Check radiator for mud or clogging. If necessary, clean radiator as follows. CAUTION: • Be careful not to bend or damage radiator fins. • When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan assembly and horns. Then tape harness and harness conn ...

    System (power door lock system)
    System Diagram System Description DOOR LOCK FUNCTION Door Lock and Unlock Switch • The door lock and unlock switch (driver side) is build into power window main switch. • The door lock and unlock switch (passenger side) is build into front power window switch (passenger side). • Interloc ...