To measure compression in the Mercedes S-Class motor (W221), do the following: Power the engine up to the working temperature. We roll out all the candles and disconnect the slot from the crankshaft position. We close the candle holes with a clear wind. The difference between the cylinders is no more than 49 ps.If the compression value is less than the normative value, then the flow in the cylinder is slightly oil and repeat the measurements. If the compression has increased since then, the piston rings or the mirror of the cylinder are likely worn. If there is no change, the problem most often is damage to the valve saddle or destruction of gaskets.
- Rwarm up the engine to the operating temperature.
- Scrolls all the candles and disconnect the connector from the crankshaft position.
- We close the candle holes in the clean vets.
- Put the compressor in the candle hole and cool the starter deck with the throttle completely open.
- The compression shall be within 1.02 ... 1.275 kPa. The difference between the cylinders is not more than 49 kPa.
- If the compression value is lower than the normative value, put some oil in the cylinder and repeat the measurements. If the compression has increased since then, the piston rings or the mirror of the cylinder are likely worn. If there is no change, the problem most often lies in damage to the valve saddles or the destruction of the laying of the SBP.
- Let' s put the candles in and connect the sensor connector to the spot.