3. Overview
4. Functional Overview
The KS Tools Digital Petrol Engine Compression Test Kit can perform wet and/or dry compression tests to determine
the pressure produced in the cylinders of a gasoline engine. It can measure, display, and store compression values of
up to 300 psi (20 bar) (2,000 kPa) for up to 12 cylinders. It can also be used as a tool for pressurizing an engine
cylinder to hold the valves closed while performing repairs. When using this tester to perform a compression test on
a cylinder, the current peak compression value is displayed in large numbers at the center of the LCD. This value is
automatically transferred to memory, and displayed in smaller numbers at the bottom right of the display. When the
pressure relief button is depressed, the current compression reading returns to zero, but the peak value is retained
in memory and continues to be displayed in the bottom right corner of the LCD. Repeated tests can be run on the
same cylinder, and the new current peak value will be displayed by the large numbers. This new peak value will not be
retained in memory unless it surpasses the value of the previous test, or the CLEAR button was pressed to erase the
old value from memory. Peak compression values can be stored for up to 12 cylinders. Each is displayed on the LCD
along with the cylinder number. During and/or after completion of testing all cylinders, the peak values can be reviewed
by pressing the CYLINDER button to scroll through the memory. Individual peak values can be erased from memory
by pressing the CLEAR button when the appropriate cylinder and value are displayed. Pressing the CLEAR button for
3 seconds at any time will clear the memory for all cylinders and return the display to cylinder 1.
Current Pressure Indication –
Displays the maximum compression value
for the indicated cylinder until the
Pressure Relief Button is pressed. This is
the measurement of the residual pressure
maintained in the hose assembly by the
Schrader valve.
Cylinder Indication –
Displays cylinder number related
to current and maximum
compression values being
displayed. Number is advanced
by pressing the Cylinder Button
Maximum Compression
Indication -
Displays maximum compression
value for the indicated cylinder.
Holds the value until the Clear
Button is pressed. Value is
stored electronically.
Clear Button -
Clears maximum compression
value shown for indicated
cylinder. Clears values for all
cylinders and returns to cylinder
1 if held for 3 seconds.
Pressure Relief Button –
Pressing this button relieves
the residual pressure in the tester
hose assembly. The value
indicated for the Current Pressure
will return to zero, but the
Maximum Compression value
will be maintained electronically
until the Clear Button is pressed.
Cylinder Advance Button –
Pressing this button advances the cylinder number by one. If the pressure in the
hose assembly is not relieved by pressing the Pressure Relief Button
or disconnecting the hose at the quick disconnect junction, the values for current
max and stored max for the new cylinder will reflect the stored hose pressure.
On/Unit/Off Button –
Pressing this button when unit is off,
turns unit on. Pressing and releasing
this button while the unit is on,
advances the current unit of
measurement forward. Pressing and
holding this button for 3 seconds
while unit is on, turns unit off. Tester
automatically shuts off after six
(6) minutes of non-use. Compression
values are maintained when unit is
cycled off and on.
Current Unit Indication –
Displays current unit of measure.
Available units of measure include
PSI, Bar, or kPa. Current unit of
measure is maintained when unit is
cycled off and on.
