Peugeot 406

since 1996 release

Repair and operation of the car

Peugeot 406
+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   + 3.1. Petrol engines
   - 3.2. Diesel engines
      3.2.1. Technical data
      3.2.2. Check of pressure of compression
      3.2.3. Installation of the mechanism of gas distribution
      3.2.4. Cover of a head of the block of cylinders
      3.2.5. Pulley of a bent shaft
      3.2.6. Casing of a gear belt
      3.2.7. Gear belt
      + 3.2.8. Pulleys of a gear belt
      + 3.2.9. Right engine mount and mechanism of a tension of a gear belt
      3.2.10. The directing roller of a gear belt
      3.2.11. Cam-shaft and pushers
      3.2.12. Check and adjustment of gaps of valves
      + 3.2.13. Removal and installation of a head of the block of cylinders (engines 1.9 liters)
      3.2.14. Removal and installation of the oil pallet
      3.2.15. Removal and installation of the oil pump
      + 3.2.16. Replacement of sealing rings of the crankshaft
   + 3.3. Repair of the engine
+ 4. Cooling systems, heating and ventilation
+ 5. Fuel system
+ 6. System of ignition
+ 7. Coupling
+ 8. Transmissions
+ 9. Power shafts
+ 10. Brake system
+ 11. Suspension bracket and steering
+ 12. Body
+ 13. Electric equipment
+ 14. Main malfunctions

3.2.2. Check of pressure of compression


The size of pressure of compression shows, in most cases, the tsilindro-piston group of the engine is how worn-out.

For measurement of pressure of compression it is necessary компрессометр for diesel engines with the maximum indications not less than 30 bars.

1. Completely charge the accumulator. Adjust gaps of valves. Warm up the engine up to the working temperature. Unscrew all nozzles.
2. Power off candles of an incandescence and the socket of the electromagnetic valve of supply of fuel. On engines 2.1 liters remove the relay of system of injection of fuel located in the ECU block.
3. In a nest of a nozzle screw in transitional the union of a kompressometr. Turn a bent shaft a starter several times. Record the maximum value of pressure of compression.
4. Repeat measurements on other three cylinders.
5. Compression pressure in all cylinders should not differ more than on two units. Pay attention that the size of compression has to increase quickly on the serviceable engine; the low pressure of compression on the first turn of the crankshaft accompanied with gradual increase in pressure on the subsequent turns of the crankshaft indicates wear of piston rings. The low size of pressure on the first turn of the crankshaft which slightly increases further indicates a thinness of a prileganiye of valves, the punched laying of a head of the block of cylinders or existence of a crack in a head of the block of cylinders. Wear of the ends of cores of valves can lead to the low pressure of compression also.
6. If pressure in one cylinder lowered, then carry out the following test. Fill in through a candle opening in the cylinder of a little engine oil and check compression pressure. If filling of oil in the cylinder increases compression pressure, it specifies that the cylinder or piston rings is worn-out.
7. Low pressure in two next cylinders indicates a laying burn-out between cylinders.
8. If pressure in one cylinder is 20% less, than in the others, and the engine idles unstably, it indicates a worn-out cam of a cam-shaft.
9. If pressure of compression is too high, it indicates that the combustion chamber is covered with a thick layer of a deposit.