3.2.16. Compression

Check of a compression allows to draw conclusions on a condition of the engine. It will help to define whether there are valves or pistons (rings of pistons) in the normal state or they are worn-out. Besides, by results of check it is possible to solve whether the engine is subject to replacement or it should be repaired in a complex. For control it is necessary компрессометр, intended especially for check of the diesel. Compression pressure in the new engine has to be 26–32 bars. The difference of pressure between separate cylinders has to make no more than 3 bars. If one or several cylinders have pressure differing from others more than on 3 bars, then it is a sign of defective valves, worn-out piston rings or pistons in cylinders.

The sequence of actions for control of a compression is given for the 2,0 l engine.
1. Raise a cowl.
2. Remove nozzles.
3. Unscrew a liquid tank for screen wipers, disconnect it and put aside.
4. 2,0 l engine: that at turn of the engine by means of a starter fuel was not injected, the lock lever (shooter) has to be installed in situation "stop". For this purpose connect the vacuum pump to a tank (shooter) of the fuel pump. Create in a tank depression about 400 Mbar and support him in all the time of control of a compression.
5. Several times turn the engine a starter to remove a deposit and a soot.

Install the transmission on idling and tighten the parking brake. During scrolling of the engine do not bend over it: accident is possible!

6. Screw компрессометр (01) with an element of communication (02) and a detail of connection (03) to the place of a nozzle in the precamera of the cylinder which is subject to check.
7. Ask the assistant to press to the full a pedal of an accelerator and to hold it in the course of check.
8. Turn the engine approximately on 9 turns, rise in pressure on the measuring device will not stop yet.
9. Remove value of controlled size and consistently check a compression in all other cylinders. Then compare the measured sizes to nominal rates. At the same time keep in mind that results of measurement depend also on the used kompressometr. If in one or several cylinders compression pressure is lower minimum, then it is necessary to check tightness of the cylinder.
10. Unscrew компрессометр (02) and establish nozzles with new laying.
11. Remove the vacuum pump.
12. Install a tank of liquid of screen wipers and fix by bolts.
13. Lower an engine cowl.

Features of engines with a capacity of 2,2 / 2,5 l

1. Remove a cross pipe of the air filter.
2. Unscrew a covering of a cover of a head of the block of cylinders (4).
3. Remove a nozzle (18) with pipelines of injection of fuel (17).
4. Kompressometr (01) fasten, according to the maintenance instruction, by means of a subconnecting detail (02) to the precamera. Establish new chart paper (03).