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6A–5 ENGINE MECHANICAL 4. Engine Lacks Compression Condition Possible cause Correction Engine lacks compression Spark plug loosely fitted or spark Tighten to specified torque or replace Valve timing incorrect Adjust Cylinder head gasket defective Replace gasket Valve incorrectly seated Lap valve Valve stem seized Replace valve and valve guide Valve spring weakened or broken Replace Cylinder or piston rings worn Overhaul engine Piston ring seized Overhaul engine. Engine Compression Test Procedure 1. Start and run the engine until the engine reaches normal operating temperature. 2. Turn the engine off. ignition system. 5. Remove the fuel pump relay from the relay and fuse box. 6. Engage the starter and check that the cranking speed is approximately 300 rpm. 7. Install cylinder compression gauge into spark plug hole. 8. With the throttle valve opened fully, keep the starter engaged until the compression gage needle reaches 9. Repeat the test with each cylinder. If the compression pressure obtained falls below the Limit; 1000 kPa (145 psi) |