LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2001 >> Millenia S >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical - 2.3L >> Compression Inspection

Compression Inspection

  1. Verify that the battery is fully charged.
    • Recharge it if necessary.
  2. Warm up the engine to the normal operating temperature.
  3. Stop the engine and allow it to cool for about 10 min  .
  4. Perform "Fuel Line Safety Procedures". Leave the fuel pump relay removed. See FUEL LINE SAFETY PROCEDURES .
  5. Remove the spark plugs.
  6. Install the SSTs  into the No. 1 spark plug hole.
  7. Fully depress the accelerator pedal and crank the engine.
  8. Record the maximum gauge reading.
  9. Inspect each cylinder as above.
    • If the compression in one or more cylinders is low, pour a small amount of clean engine oil into the cylinder and recheck the compression.
      Fig 1: Checking Cylinder Compression
      G01137635Courtesy of MAZDA MOTORS CORP.
    • If the compression increases, the piston, piston rings, or cylinder wall may be worn out.
    • If the compression stays low, a valve may be stuck or improperly seated.
    • If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the cylinder head distorted.

    Compression 

    Fig 2: Compression Specification Table
    G01137636Courtesy of MAZDA MOTORS CORP.
  10. Remove the SSTs  .
  11. Install the fuel pump relay.
  12. Install the spark plugs.
scientia non olet · About LEMON Manuals