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COMPRESSION PRESSURE EM-23 < ON-VEHICLE MAINTENANCE > C D E F G H I J K L M A EM N P O • If compression pressure is below the minimum value, check valve clearances and parts associated with combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head • If a cylinder has low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression. - If the added engine oil improves the compression, piston rings may be worn out or damaged. Check pis- ton rings and replace if necessary. - If the compression pressure remains at low level despite the addition of engine oil, valves may be mal- functioning. Check valves for damage. Replace valve or valve seat accordingly. • If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl- 9. After inspection is completed, install removed parts. 10. Start the engine, and check that the engine runs smoothly. 11. Perform trouble diagnosis. If DTC appears, erase it. Refer to |