IMPORTANT CONSIDERATIONS WHEN TESTING
1.
There will always be some leakage past the piston rings, even in a new engine.
Therefore, you will always hear some leakage at the oil dipstick tube.
2.
If 100%, or excessive leakage, shows on the Leakage Gauge (part #4), the
cylinder may not be at TDC (Top Dead Center) on the compression stroke.
Check to make sure the cylinder is at TDC so that the valves have closed.
(See Assy. Diagram.)
3.
Similar to compression testing, it is important that all cylinders have fairly uniform
readings. Differences of 15% to 30% indicate excessive leakage. Large engines
tend to leak more than small engines. If leakage is excessive on a vehicle with
relatively low mileage, the piston rings may be stuck. Treat the engine with a
tune-up oil for a period of time and retest with the Cylinder Leakage Tester.
4.
The lower the pitch of the leakage sound, the greater the leakage.
5.
Good listening devices are a length of hose (not included) or a mechanic’s
stethoscope (not included) with the probe removed.
6.
The Leakage Gauge (part #4) readings may vary 10% or more when making
repeat tests on the same cylinder(s). The piston position and the temperature of
the engine can cause the readings to vary.
7.
If a vehicle has multiple problems, such as bad piston rings and burned valves,
the Cylinder Leakage Tester may only show the most serious of the problems.
OPERATING INSTRUCTIONS
NOTE:
For additional references to the parts mentioned in the following pages, refer
to the
Assembly Diagram on page 7.
1.
IMPORTANT: Make sure the Regulator Knob (part #5) is turned fully coun-
terclockwise before connecting the Cylinder Leakage Tester to an air com-
pressor. Failure to do so may result in damage to the tool.
2.
Prepare the engine for leakage testing by starting the engine and allowing it to
warm up to its normal operating temperature. Then, switch off the ignition.
CAUTION: Always make sure to run an engine in a well ventilated area
(never a closed garage). When emitted from a running engine, carbon
monoxide is an odorless, non- visible vapor that can cause serious
personal injury or death if inhaled.
SKU 04317
PAGE 5
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