OPERATIONAL PERFORMANCE TEST / Engine Test ENGINE COMPRESSION PRESSURE Summary: 1. Measure compression pressure in the cylinders and check for a decline in engine power. 2. Check exhaust gas color. Keep track of engine oil consumption. 3. Check for abnormalities in the intake system, in- cluding the air filter. Preparation: 1. Confirm that valve clearances are correct. 2. Confirm that the batteries are charged properly. 3. Run the engine until the coolant temperature gauge reaches the operating range. 4. Remove the negative terminal of the battery. Remove all the glow plugs from each cylinder. 20 N m (2.0 kgf m, 14.8 lbf ft) IMPORTANT:
If disconnecting the connector of injector, fuel cannot be jetted. Therefore, ECM judges that the fuel system is faulty and the fault code is displayed. After measurement, de- lete the displayed fault code. 5. Disconnect the connector of injector. 6. Install the negative terminal of the battery. 7. Turn the starter. Exhaust foreign subjects from the cylinder. 8. Install a pressure gauge and an adaptor (Isuzu 5-8840-2815-0) to the glow plug mounting part. (Sufficiently install them in order to prevent air leakage.) Measurement: 1. Turn the starter and measure compression pres- sure of each cylinder. 2. Repeat the measurement three times and calcu- late the mean values. Evaluation:
Refer to Operational Performance Standard in Group T4-2. Remedy: Refer to the engine shop manual. Injector T1T1-04-03-001 Glow Plug T1T1-04-03-002 T4-3-3