Checking Engine Cylinder Pressure (Diagram)

Operating Diagram:

Warm up the engine and stop it.

Remove all spark plugs, turn the engine crankshaft with the throttle fully open, and measure the compression pressure in all cylinders.

(2) Judgment of cylinder pressure

If the compression pressure is low, inject a small amount of engine oil into the spark plug holes and measure the compression pressure again. If the compression pressure increases, the piston ring or cylinder bore may be worn or damaged. If compression pressure remains low, valves may be stuck, valve seats may be damaged, or cylinder liners may be leaking.

Maintenance Tip:

When checking cylinder pressure, pay special attention to the following:

Disconnect all injector connectors to prevent fuel injection.

Remove the ignition or disconnect the ignition connectors to prevent sparking.