Note: Compression data for various engines is given in the chapter "Technical characteristics of petrol and diesel engines". To carry out the check, you will need a compression tester and a spark plug/preheater simulator (adapter).
Measure the loss of compression in each cylinder at the top meter point (the average difference between cylinders should not exceed 20%).
Note: A large loss of compression will cause noise or air bubbles in the cooling system. If the value is incorrect, localizing the noise of air leakage will allow you to locate the faulty part using a technical stethoscope or rubber hose (see the table "Troubleshooting" in Chapter "Checking for a cylinder leak").
Examination
Attention: The check is performed on a cold engine.
Original can be viewed at [www.PeugeotBook.ru]
After turning off the ignition: wait 15 minutes before disconnecting the battery to ensure that the "learning" results of the various ECUs are memorized.
Disconnect the battery.
Disconnect the engine control unit.
Remove the spark plugs or glow plugs (see the corresponding operation).
Reconnect the battery.
Make sure the starter engine speed is correct (minimum speed value): 2500 rpm.
Install the spark plug simulator on cylinder No.1 and tighten to 10 Nm.
Note: Use a mirror to connect the flexible hose of the compression tester to the spark plug simulator.
Connect the compression tester and the simulator.
Connect the negative battery terminal.
Turn on the starter for 10 seconds (with the engine control unit switched off).
The pressure in the cylinder should be 20±5 bar (for a new engine).
Disconnect the measuring devices.
Check cylinders #2, #3 and #4 in a similar manner.
Note: The difference between the two cylinders should not exceed 5 bar. Hold the pressure gauge down at the end of the compression stroke.
Caution: If the compression readings are too low, check the air filter and cylinder head gasket before checking the engine for cylinder leaks.
Disconnect the battery.
Reinstall the spark plugs or glow plugs (see the corresponding operation).
Connect the engine control unit.
Reconnect the battery.
Perform vehicle diagnostics.