3.1.16. Compression
Check of a compression allows to draw conclusions on a condition of the engine. At its check it is possible to establish whether valves or pistons (piston rings) are normal or they are worn-out. Besides, by results of control it is possible to define whether the engine is subject to replacement or it can be repaired in a complex. For check the device is necessary for control of a compression.
Pressure difference between separate cylinders has to make at most 1,5 bars. If the difference in pressure makes more than 1,5 bars, then it is a sign of defective valves, worn-out piston rings or guides of the cylinder. If reach a wear limit, the engine needs to be repaired or replaced.
Pressure of compression has to make: for the 4-cylinder engine of 10-14 bars, for 6-cylinder about 12 bars.
PERFORMANCE ORDER |
1. For control of a compression warm up the engine. After achievement of working temperature of cooling liquid pass 5 more km to provide the sufficient temperature of engine oil. |
2. Raise an engine cowl. |
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3. 1,8 / 2,0 l engine: switch off ignition. Disconnect the sensor of a position of a bent shaft (L5) from the PMS monitor. |
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4. 2,2 / 2,8 l engine: switch off ignition. Remove a monitor covering behind a forward wall of a body. Disconnect the plug (A) from the HFM monitor (N3/4). |
5. Unscrew all spark plugs. |
6. Several times scroll the engine a starter to remove deposits and soot.
Prevention
Install the transmission in the provision of idling and tighten the parking brake. During scrolling do not bend over the engine: danger of a trauma!
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7. Insert the device of control of a compression (01) according to the maintenance instruction or twist a rod (04) in a spark plug opening. Enter a new leaf for the chart (03), (02) an intermediate detail. |
8. Charge to the assistant to press an accelerator pedal against the stop and to hold it until the end of the check pressed. |
9. The engine has to make about eight turns, rise in pressure by the measuring device will not be fixed yet. |
10. One by one check all cylinders and compare to nominal rate. |
11. Then insert spark plugs. |
12. At the switched-off ignition put on the sensor of a position of a bent shaft PMS or the HFM monitor. Establish a cover of the operating HFM device. |
13. Close a cowl. |
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