:  Mar 14, 2006



Overview

As diagnosis of the different areas of the engine is covered in other sections and by general procedures, this section is limited to a compression and an oil pressure test.

For specific areas of the engine, refer to the general procedures in this section and the relevant section of the manual.

Inspection and Verification

. Verify the customer concern.

. Visually inspect for obvious mechanical faults.

Mechanical
  • Engine oil level
  • Coolant level
  • Transmission fluid level
  • Fuel level
  • Coolant leaks
  • Oil leaks
  • Fuel leaks
  • Visibly damaged or worn parts
  • Loose or missing nuts or bolts
  • Fuel contamination/grade/quality
  • Sensor fitment/condition
  • Viscous fan and solenoid

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step

. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before carrying out the following procedures.
  Make sure that all DTCs are cleared following rectification.


Compression test

  : Make sure the parking brake is applied and the gear selector is in neutral (or park for vehicles with automatic transmission) before beginning this procedure. Failure to follow this instruction may result in personal injury.

. Remove the fuel pump relay.

. Start the engine and allow to idle.
  The engine will run for a few seconds then stall


. Remove the spark plugs.


. Install a compression tester.

. Hold the accelerator pedal to the floor and crank the engine a minimum of five and a maximum of ten engine revolutions and record the reading.

. Repeat the test on each cylinder, cranking the engine approximately the same number of compression strokes.
  A reliable indicator of a problem is one cylinder reading lower than the others, rather than a minimum figure for all cylinders


. Install the components in reverse order, observing the specified tightening torques.

. Check and clear any DTCs.

Oil Pressure check

  : The spilling of hot engine oil is unavoidable during this procedure, care must be taken to prevent scalding. Failure to follow this instruction may result in personal injury.

:
  Before checking the oil pressure, carry out a 6 mile (10 kilometer) road test. Do not attempt to achieve normal operating temperature by allowing the engine to idle.

. Remove the engine oil pressure sensor.


. Install the special tool to the oil filter housing.

. Install the special tool gauge and tighten the union.



. Check and top-up the engine oil, if required.

. Start and run the engine.

. Note the oil pressure readings with the engine at idle and at 3,500 rpm.


. Turn off the engine.

. Remove the special tools.

. Install the oil pressure sensor.


. Check and top-up the engine oil, if required.