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AC 2018BL
MULTI-BRAND COMPRESSION GAUGE PETROL-DIESEL/DCI
Compression Testing
1. Check the engine oil is at the correct level.
2. Remove all of the glow plugs/spark plugs from the engine.
3. Select the applicable adaptor from the kit and screw it into the first glow/spark plug port,
ensuring there is a good seal with the O-ring (if fitted). Connect the coupling on the pressure
gauge hose to the adaptor, ensuring it locks into place.
4. Turn over the engine using the starter motor and observe the gauge, looking for a steady
increase in the reading and note the maximum reading obtained. Refer to the vehicle/engine
manufacturer's workshop manual for compression data.
5. Depress the Re-set Valve (situated under the gauge) to release the pressure. The Re-set Valve
allows the test to be repeated if required without disconnecting the tester from the glow/spark
plug port.
WARNING! Always release pressure via the Re-set Valve BEFORE disconnecting the Tester.
6. Disconnect the compression tester from the adaptor and remove the adaptor from the glow/
spark plug port. Install them into the next cylinder's glow/spark plug port and repeat the tests.
Continue the tests for all of the remaining cylinders in turn.
NOTE: A variation in compression readings between cylinders is often a better indication of engine
problems than the individual values of compression
CONDITION DE COMPRESSION
Low compression reading on some cylinders.
High relative compression readings and
relatively equal cylinder readings.
Lower relative compression readings. One or
more cylinders lower than others.
TDC Indicator Tool
1. Remove the glow/spark plug from cylinder number 1. It may also be necessary to remove all
glow/spark plugs to facilitate manual turning over of the engine.
2. Select the applicable adaptor from the kit and screw it into the glow/spark plug port of cylinder
number 1. Ensure that there is a good seal with the O-ring (if fitted). Connect the coupling on the
TDC finder to the adaptor, ensuring it locks into place.
3. Position the indicator in a vertical position, in a suitable viewable location, using the magnetic
hook if needed.
4. Turn the engine over manually, using a spanner or socket on the crankshaft pulley, in the
direction of engine rotation and watch for the float to rise in the tube. As the piston rises on the
compression stroke, the float will rise to the top of the tube and stay there, when the piston goes
past TDC and compression is lost, the float will suddenly sink. Note the position and temporarily
make suitable marks to indicate TDC,
or compare with existing timing marks.
ACTION/DIAGNOSTIC
(a) Use oil in cylinder to see if rings are worn.
(b) If compression increases, rings and/or cylinder wall are
worn.
(c) If compression does not rise, do a cylinder leakage test
to
determine source of problem.
If excessive exhaust emissions, lack of power, poor
performance, or poor fuel consumption do a cylinder
leakage test to determine source
of problem.
Do a cylinder leakage test to determine source of problem.
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