CLAS AC 0115 Mode D'emploi page 6

AC 0115
COMPRESSIOMETRE ESSENCE
TESTING
1. Connect the quick locking head of air gauge assembly to the pipe of the rubber cone
hose then screw the pipe in or push the erubber hose into the spark plug hole.
2. Run engine for at least four compression cycles or until the pressure stops rising. Then
cut the engine and note the value.
3. Remove the tester and return air gauge to zero. Fit the spark plug and the connecting
wires back and continue the test of the next cylinder.
RESULTS ANALYSIS
1. If the cylinder is working properly, the pressure must increase with each compression cycle then
climb up to the max. The pressure of each cylinder for the same vehicle must be in accordance
with the standard set by the manufacturer.
2. If the pressure remains the same or does not increase after several cycles of compression, the
valve is probably clogged.
3. If the pressure in two adjacent cylinders is not greater than 20lbs, or inferior to another cylinder
then the cylinder head gasket is to be damaged.
4. If the pressure is much higher than the standard established by the manufacturer, it is possible
that there are residues of carbon.
5. If there are significant differences in pressure between the cylinders, put a teaspoon of SA30 oil
in each of them and then try again. If after that, the pressure has increased too much the problem
can come from improper installation of the cylinder or the piston ring. If the pressure has not
changed then control the valve.
6. Refer to the manufacturer's maintenance instructions for the pressure standard of the cylinder.
WARNINGS
1. This tester is only suitable for gas cylinder (car or motocycle). Do not use it on the diesel
cylinder of car. Be careful, the high temperature of pressure during test.
2. During test, if the reading of air gauge is getting up but getting down after the engine
is stopped then the stop valve in the gauge is broken and had to be sent for repairment.