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 down.
7. Set the compression gauge to zero, then start rotating the engine crankshaft with the starter.
8. Measure the compression in all cylinders and record the obtained values.
9. If the compression value is low, pour in 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 must not be lower than 70% of the maximum compression value in the other cylinders. At the same time, the compression in none of the cylinders must be lower than 690 kPa. For example, if the maximum compression value in the cylinders is 1035 kPa, the minimum permissible compression value in all other cylinders is 725 kPa (1,035 x 70% = 725).
Note.
In a normal cylinder, the compression value is displayed quickly and evenly up to the set value.
If there are 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.
If there are 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 compression below normal, 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.
Original source is on the website: OpelBook.ru
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