2. Remove the glow plugs.
3. Disconnect the high pressure fuel pump wire connector to prevent fuel supply and test process.
4. Connect hose with pressure gauge adapter to check compression (KV113BO400 (Mot. 1592)) (A) to the hole of the incandescent lamp.
5. Connect pressure gauge (IN) hose with adapter (A).
6. Turn the ignition switch and position «START» to rotate the crankshaft with a starter and check the compression value and the cylinder.
7. Follow the same procedure for the other cylinders.
If the comparison of the nodpoession is the minimum allowable, check the valve clearances and the condition of the elements associated with the combustion chamber (valves, valve seat, pistons, piston rings, cylinder walls, cylinder head, cylinder head gasket). After checking the relevant parts, again measure the compression in the cylinders.
If one of the engine cylinders has a low compression value, pour a small amount of engine oil into the spark plug hole, then repeat the measurement.
If compression improves after adding oil, this indicates worn or damaged piston rings. Check the condition of the piston rings and replace them if necessary.
If the compression is still low after adding oil, this indicates a malfunction and valve operation. Check valves for damage. If necessary, replace the corresponding valve or valve seat.
If dia adjacent cylinders have a low compression value that does not change after adding engine oil, this indicates damage to the cylinder head gasket, it is necessary to replace it with a new one.
8. Disconnect the pressure gauge (IN) and hose with adapter (A).
9. After checking, install the removed parts.
10. Start the engine and make sure it runs smoothly.
11. Perform troubleshooting. When issuing fault codes, remove them.