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WorksheetsEngine Mechanical Testing
Total questions: 15
Worksheet time: 8mins
What is this?
Cylinder Compression Gauge
Cylinder Leakage Tester
Manifold Gauge
Compression Tester
What it the purpose of Cylinder Leakage Tester?
To identify cylinder compression leakage area by supply compressed air through the gauge.
To carry out wet and dry test of cylinder
To calculate the compression ratio
To measure cylinder blow-by
Item number 6 is ......
Regulator Gauge
Base Gauge
Leakage Gauge / Percentage Gauge
Low Pressure Gauge
Item number 7 is ......
Regulator Gauge
Base Gauge
Leakage Gauge / Percentage Gauge
Low Pressure Gauge
The operator may also locate the source of the compression loss by listening at these places:
Oil dipstick tube for leaking cylinder rings.
Radiator fill cap for cylinder wall cracks or gasket leaking
Adjacent port for head gasket leaking.
Tailpipe for intake valve leaks.
Carburetor air horn or throttle valve for exhaust valve leakage.
Select the CORRECT Statement
A “good” reading will show compression loss of all cylinders at about the same rate.
Compression loss of exhaust valve can be listened at throttle body / valve.
A large difference of 15% to 30% comparing one cylinder to the others indicates a problem.
Piston position and engine temperature do not cause variable readings of Cylinder Leakage Tester.
Select the correct procedures of using a Cylinder Leakage Tester on a vehicle's engine.
I. Remove park plugs.
II. Connect the Cylinder Leak-Down Tester to a compressed air source.
III. Position the cylinder to be tested at TDC.
IV. Turn the Regulator Knob clockwise until the Gauge reads “0” (zero) at the end of the yellow band.
V. Set the air compressor’s regulator to 100 PSI
I, II, III, IV, V
I, III, II,V, IV
I, III, IV, II, V
I, II, IV, V, III
Cylinder Leakage Testing also known as .....
Cylinder Leak Down Test
Cylinder Compression Test
Compression Dry Test
A good and normal vacuum gauge reading for engine idling is ...
below 18 inHg
between 17 inHg to 21 inHg
above 22 inHg
0 inHg
What is the possible result on vacuum gauge reading if exhaust system blocked or clogged when the engine is at 2000rpm?
above 21 inHg
below 17 inHg
move from 0 inHg to 20 inHg
Remain between 17 inHg to 21 inHg
'Throttle Snap Test' of a engine and vacuum gauge shows needle drop to 0 inHg and back to 20-23 inHg. What is the possible cause of this situation?
worn piston rings
weak valve springs
leakage of intake manifold
blocked exhaust system
"When the throttle plate is
closed, manifold vacuum should be higher than when the throttle plate is open."
The statement above is....
True
False
"A slow turning engine will
produce less manifold vacuum than a fast turning engine."
The above statement is...
True
False
"Manifold vacuum will be at its
highest when the engine RPM is high, and the throttle plate is closed."
The above situation will happen during....
acceleration
deceleration
cranking
idling
What is the possible cause for vacuum gauge reading fluctuates and changes quickly during idle?
valve guide worn
sticky valve
leakage of intake manifold
low compression in one cylinder
