The measurements are carried out as follows:
- The engine must be warmed up to operating temperature.
- Remove the wire on the injection pump switch and insulate it (see section «Diesel injection system»).
- Remove the pipes for supplying fuel to the injectors from the injection pump and fold it on a clean rag.
- Remove all injectors.
- Remove the heat-insulating gaskets from the holes for the nozzles.
- Screw the device with the adapter into the hole for the nozzle of the first cylinder; place the old heat-insulating gasket in the cylinder to be measured.
- Apply the handbrake, place the shift lever in neutral, or place the automatic transmission in «R».
- Turn on the starter and do not turn it off until the instrument readings increase.
Write down the values and move on to measurements on the next cylinder.
Pressure values
The following compression values should be achieved on the engine (same for engines with and without turbocharging):
- Normal compression pressure: 34.0 bar
- Wear limit: 26.0 bar
- Maximum pressure difference between individual cylinders: 5.0 bar.
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