1. Warm up the engine to operating temperature and remove the high-voltage wires from the spark plugs. Remember that the wires must be taken by the candle cap, and not by the wire itself. If there are no markings on the wires, mark them so as not to be confused during subsequent installation. Remove spark plugs.
2. Disconnect the central high-voltage wire from the ignition distributor.
3. Insert or screw the compression tester into the spark plug hole of cylinder #1 (pic. B:4) and ask the assistant to rotate the engine with a starter, having pressed an accelerator pedal against the stop. Rotate the motor until the meter reading stops increasing (at least two full revolutions of the crankshaft). Record the instrument readings.
4. Write down the compression and cylinder number.
5. Repeat the measurement on the remaining cylinders and record the results.
6. Compare the measurement results with the section data "Technical data". If the compression values are high enough and differ in different cylinders by no more than 10%, then we can assume that the engine is in good condition.
If the compression in one or two cylinders is lower than in the others, repeat the measurement, pouring a little engine oil into the cylinder being checked through the spark plug hole. If the compression increases, it means that the piston rings or cylinder walls are worn or damaged. If the compression value remains the same, this indicates a leak in the valves or cylinder head gasket.
Measures to eliminate such malfunctions are described in the chapter "Engine...".
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