2. Turn off the ignition system.
3. Disable the fuel injection system.
4. Remove all spark plugs.
5. Turn on the ignition.
6. Press the accelerator pedal all the way.
7. Set the compression gauge to zero, then start turning the engine crankshaft with a starter.
8. Measure the compression in all cylinders and record the values obtained.
9. If the compression value is low, infuse approximately 15 ml (one tablespoon) engine oil into the combustion chamber through the spark plug socket. Measure the compression again and record the values obtained.
10. The minimum compression in any of the cylinders should not be lower than 70% of the maximum compression in the remaining cylinders. In this case, in any of the cylinders, the compression should not be lower than 690 kPa. For example, if the maximum compression value in the cylinders is 1035 kPa, the minimum allowable compression value in all other cylinders is 725 kPa (1035 x 70% = 725).
Note.
In a normal cylinder, the compression value is displayed quickly and evenly up to the set value.
In the presence of leaks through the piston rings, the compression value is initially low, then gradually begins to increase, but never reaches the set level. After adding oil to the cylinders, the compression increases significantly.
In the presence of leaks through the valves, the compression value is low at first and remains at the same level without increasing further. After adding oil to the combustion chamber, the compression practically does not change.
If two adjacent cylinders have low compression, and after adding oil to the combustion chambers, there is no increase in compression, the cause may be a leak in the gasket between the cylinders.
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