COMPRESSION PRESSURE Measurement of Compression Pressure 5 1. Be sure the oil in the crankcase is at the proper 9. If one or more cylinders read low, pour small level and the battery is properly charged. amount of engine oil into the cvlinders through 2. Warm up the engine. the spark plug holes. 3. Turn the ignition switch off, then remove all I If compression improves considerably, the the spark plugs. piston rings are worn or damaged. 4. Disconnect the anti-dieseling solenoid valve o if compression does not improve, valves are connector. sticking or seating poorly. - If two adjacent cylinders indicate low com- pression pressures and pouring oil into cylin- ders does not increase the compression, the cause may be a cylinder head gasket leak between the cylinders. Antivdiosoling solenoid valve SEMDZUE 5, Install a compression tester in No. 1 cylindert seMea7 l R 6. Depress the accelerator pedal fully to keep the throttle valve wide open 7. Crank the engine and read the highest gauge indication. 8. Repeat the measurement on each cylinder as shown above Compression pressure: kPa (kg/cmz , psiilrpm Standard 1,245 (12.7, 181)]350 Minimum 981 (10.0, 142)/350 Difference limit between cylinders: 98 (1.0, 14)]350