UENR0623-02 69 Air Inlet and Exhaust System 3. The electronic service tool will display Ash Service Calibration Successful when the calibration has been completed. i04461759 Compression - Test The cylinder compression test should only be used in order to compare the cylinders of an engine. If one or more cylinders vary by more than 350 kPa (51 psi), the cylinder and related components may need to be repaired. A compression test should not be the only method which is used to determine the condition of an engine. Other tests should also be conducted in order to determine if the adjustment or the replacement of components is required.
Before the performance of the compression test, make sure that the following conditions exist: Illustration 58 g02647199 Typical example The battery is in good condition. The battery is fully charged. 1. Remove the glow plug (1). Refer to Disassembly and Assembly, “Glow Plugs - Remove and Install” for the correct procedure. The starting motor operates correctly. The valve lash is correct. 2. Install a suitable gauge for measuring the cylinder compression in the hole for the glow plug (2). All glow plugs are removed. 3. Remove the fuse for the glow plugs. The ECM is powered. 4. Operate the starting motor in order to turn the engine.
Record the maximum pressure which is indicated on the compression gauge. The fuel pressure sensor is connected. The suction control valve is connected. 5. Repeat steps 2 and 4 for all cylinders. 6. Install the fuse for the glow plugs. i04823055 Engine Valve Lash - Inspect Table 7 (1) This Tool is used in the aperture for the electric starting motor. Required Tools Tool Part Number Part Description Qty A(1) 27610291 Barring Device Housing 1 27610289 Gear 1