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4 ENGINE ENGINE FAULT DIAGNOSIS ENGINE OIL PRESSURE TEST Service tools: WARNING: Use suitable exhaust extraction if test is being carried out in NOTE: Excessive lubrication pressure can effect workshop. CYLINDER COMPRESSION - TEST WARNING: If vehicle has been running, engine oil will be hot, care must be taken when fitting equipment to prevent personal injury due to scalding. Test Test 1. Start and run engine until normal engine operating temperature is achieved (thermostat Equipment: 1. Check lubricant is to correct level. open). 2. Place vehicle on a ramp. 2. Remove all spark plugs. 3. Disconnect battery negative terminal and 3. Disconnect both coil negative (WB) leads 4. Insert compression gauge, crank engine until 4. Fit the test gauge. reading stabilises. 5. Connect battery terminal. 5. Expected readings, throttle fully open, battery 6. Start and run engine to normal operating fully charged 170 - 180 psi temperature. 6. If compression is appreciably less than correct 7. At a steady engine speed of 2400 rev/min - figure, or varies by more than 10%, piston minimum engine oil pressure reading should rings or valves may be faulty. be - 1.76 kg/cm². 7. Low pressure in adjoining cylinders may 8. I f there is no oil pressure check for air lock in indicate a faulty head gasket. system. See Service schedule. 9. I f the pressure is low, see Remove and overhaul oil pump. remove oil pressure switch. RR2354E |