Chevrolet Lanos (since 2004 release)
1. Car device
2. Recommendations about operation
3. Malfunctions in way
4. Maintenance
5. Engine
5.1. Features of a design
5.2. Check of a compression in cylinders
5.3. Removal and installation of mudguards of the engine
5.4. Replacement of support of a suspension bracket of the power unit
5.5. Installation of the piston of the first cylinder in the provision of VMT of a step of compression
5.6. Removal, installation and troubleshooting of a flywheel
5.7. Replacement of details of consolidation of the engine
5.8. Head of the block of cylinders
5.9. Removal and installation of the engine
5.10. Repair of the engine
5.11. Lubrication system
5.12. Cooling system
5.13. System of production of the fulfilled gases
5.14. Engine power supply system
5.15. System of catching of vapors of fuel
5.16. System of recirculation of the fulfilled gases
6. Transmission
7. Running gear
8. Steering
9. Brake system
10. Electric equipment
11. Body
12. Wheels and tires
13. Purchase of spare parts
14. A trip on HUNDRED
15. Winter operation of the car
16. Preparation for checkup
17. Advice to the beginning mechanic
18. Appendices
19. Schemes of electric equipment



5.2. Check of a compression in cylinders

Compression (pressure at the end of a compression step) in cylinders — the major indicator for diagnostics of a condition of the engine without its dismantling. And on a difference of values in separate cylinders it is possible with sufficient degree of accuracy to determine degree of the general wear of details of conrod and piston group of the engine by its average value, to reveal malfunctions of this group and details of the valvate mechanism.
Check a compression the special device — kompressometry which can be got freely in large shops of auto parts now.

So looks компрессометр, used for an illustration of this book. There are options of kompressometr at which instead of the carving union for a vvorachivaniye instead of a spark plug the rubber tip is established. Such kompressometra when checking a compression just strongly press to a candle opening.

Important condition of correctness of indications when checking a compression is serviceability of a starter and its electric chains, and also full state of charge of the rechargeable battery.

1. Launch the engine and warm up it up to the working temperature.
2. Stop the engine, remove tips of wires from spark plugs and turn out all candles (see. "Replacement and service of spark plugs").
3. Disconnect a block of a plait of low-voltage wires from the ignition coil, having disconnected thereby system of ignition.

Provorachivaniye of the engine a starter at the disconnected tips of high-voltage wires and not switched-off coil of ignition can lead to breakdown of its high-voltage chain.

4. Switch-off the fuel pump, having taken out a safety lock No. 11 …
5. … or the relay of the fuel pump in the assembly block (see. "Assembly blocks").
6. Screw in a candle opening of the checked cylinder компрессометр.
7. Press an accelerator pedal against the stop completely to open a butterfly valve.
8. Include a starter and turn it a bent shaft of the engine until pressure in the cylinder does not cease to increase. It corresponds to about four steps of compression.

For obtaining the correct indications of a kompressometr the bent shaft has to rotate with a frequency of 180-200 min.-1 or above, but no more than 350 min.-1.

9. Having written down indications of a kompressometr …
10. … establish it to the shooter on zero, having pressed the valve of production of air.

At kompressometr of other design of the indication can be dumped in other ways according to the instruction to the device.

11. Repeat operations of subitem 6-10 for other cylinders. Pressure has to be not lower than 1,0 MPas and more than on 0,1 MPas should not differ in different cylinders. The lowered compression in separate cylinders can result from leaky landing of valves in saddles, damages of laying of a head of the block of cylinders, breakages or burnings of piston rings. The lowered compression in all cylinders indicates wear of piston rings.
12. For clarification of the reasons of an insufficient compression fill in in the cylinder with the lowered compression about 20 ml of pure engine oil and again measure a compression. If indications of a kompressometr raised, malfunction of piston rings is most probable. If the compression remained an invariable, so plate of valves leaky adjoin to their saddles or laying of a head of the block of cylinders is damaged.

The reason of an insufficient compression can be found out also supply of compressed air in the cylinder in which the piston is previously installed in compression step VMT. For this purpose remove a tip from a kompressometr and attach to it a compressor hose. Insert a tip into a candle opening and give to the cylinder air under pressure of 0,2–0,3 MPas. In order that the bent shaft of the engine was not turned, include the highest transfer and slow down the car the parking brake. An exit (leak) of air through throttle knot testifies to leakage of the inlet valve, and via the muffler — to leakage of the final valve. At damage of laying of a head of the block of cylinders air will come out through a mouth of a broad tank in the form of bubbles or in the next cylinder that is found on the characteristic hissing sound.

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5.1.1. Possible malfunctions of the engine, their reason and ways of elimination
following page"
5.3. Removal and installation of mudguards of the engine