Check compression in the cylinders of the engine
Check compression (pressure at the end of the compression stroke) in
cylinders of the engine is carried compressometer (Fig. 4).
Before measurement, check the correct valve
clearances and, if necessary, adjust them. Then the engine
heated to the temperature of the coolant (60-80 * C)
turn out all the spark plugs and the air is completely open
and the throttle valve. After this, insert the rubber
Tip 6 compressometer the hole plugs of the first cylinder,
tightly to the edge of tip openings and bore
Crank the engine starteromdo until the pressure in the
cylinder will not cease to grow. To obtain prravilnyh
testimony compressometer engine crankshaft to rotate
with a frequency of 180-200 1 \ min or more but noxtexceeding 350 1 \ min.
The battery must be fully charged. But
shall be allowed a temporary increase in voltage at the terminals
starter connecting an external source of direct current.
Writing the value of the maximum davleniyagazov in the cylinder, release
air from compressometer by removing 1-2 turnover cap nut 3;
Gradual return of the arrows to zero again tighten the nut.
In the same way the compression test, alternately in the other
the cylinders. The pressure must be not less than 10 kg \ cm2 and should not be
differ in different cylinders for more than 1 kg \ cm2.
The reduced compression in some cylinders may occur in
result of leaky valves, landing in the saddle, pad damage
cylinder heads, broken, or stick piston rings.
To clarify the reasons for the lack of compression pour 20-25 cm3
clean oil into the cylinder with low compression and it is measured again.
Higher rates compressometer in this case
often indicate failure of piston rings. If the
magnitude of compression remains unchanged, this indicates
by gapping the valves to their heads or saddles
damage to the cylinder head gasket.
The reason for the lack of compression can be detected and fed
compressed air in the cylinder in which piston is placed in a pre-
position of top dead center (TDC) clock
of compression. To this end, removing the rubber cone compressometer
tip and attach the hose compressometer,
insert the tip of a candle in the hole of the cylinder and is fed into it
air at a pressure of 2-3 kg \ cm2. In order to prevent
cranking the engine include a higher transmission
in the transmission and inhibit the vehicle parking brake
The output (drain) of air through the carburetor indicates
inlet valve leaks, and through muffler - about leaks
the exhaust valve. If the damage cylinder head gasket
Air bubbles will come out through the neck of a radiator or in
adjacent cylinder, which is detected by the characteristic hissing