CLAS AC 0115 Mode D'emploi page 5

AC 0115
PETROL COMPRESSION GAUGE
1. Air gauge with quick coupling & release valve
2. High-tension connecting pipe with safeety lock coupling
3. Cranck shaft type test pipe with rubber plug
4. Transverse axle test pipe with rubber plug
10. M10x1.0 adapter
12. M12x1.25 adapter
14. M14x1.25 adapter
18. M18x1.5 adapter
PREPARATION
1. Start engine for 10 minutes approximately or until it reaches its normal temperature.
2. Stop engine then disconnect the spark plug and connect wires. Have the wires marked with
number to distinguish and reconnect correctly.
3. Remove all dirt and any debris around the spark plugs. It is strongly recommended to wear eye
protection and make cleaning with compressed air. Store all neatly on a clean and level surface.
This helps to identify the cylinders having a problem comparing: the appearance of each spark
plug to the compression level of the corresponding cylinder.
4. On vehicles with a standard distributor, disconnect the cable from the coil (high voltage cable)
of the distributor cap and attach it to a proper grounding or disable the ignition by disconnecting
the positive terminal (BAT) of the coil.
For vehicles with no distributor, disable the ignition system by removing the electronic ignition
fuse control module or unplug the crankshaft position sensor.
NOTE: Consult the appropriate service manual to determine which element or fuse must be
temporarily removed.
5. Remove the air fi lter of the carburetor or throttle body and the control block in open position.
NOTE: NEVER put anything into the throttle body, as this can cause internal damage to the engine.
On vehicles with injection in the intake port, remove the covers throttle control (as needed) and
lock the position control of full throttle.But, the reading of pressure got from this method is not
so accurate.