OPERATING THE TESTER
Select and install the proper size steel testing adapter into the compression chain -
b e r -- l o c a t e d near the right front of the unit. The steel adapter should be in-
s t a l l e d finger tight.
S c r e w the cleaned plug with gasket
into the adapter which has been installed in
t h e compression chamber finger tight.
NOTE: 7/8" spark plugs screw directly into the compression chamber with no
I M P O R T A N T : Air leakage at the adapter or spark plug threads is required, as it
helps exhaust ionized air from the compression chamber and facili-
tates steady control of air pressure. Installing adapter or spark plug
with a wrench to eliminate air leakage is not recommended as false
Connect the high voltage clip to the spark plug.
Move the tester gage dial (outer ring) so the plug gap arrow is alined with
s e t t i n g of the gap of plug being tested (See Fig. #2 -- Assume 0.035" Gap.).
P r e s s switch button and raise air pressure by opening the black air value (lo-
cated on the top right front corner of unit the until the spark goes out.
N O T E : With low pressure and a small spark plug gap, the plug may continue to
spark. This is acceptable.
While continuing to press the switch button, rotate the air valve to reduce pressure
until the spark becomes steady, Observe the section of the tester gage dial that
t h e gage pointer is now indicating. This reading is the sparking efficiency of the
plug being tested.
When the pointer is in the green or to the right of the green, the plug is good.
With the pointer in the yellow, the plug is questionable. Any readings of the dial
pointer in the red indicate a bad plug and the plug should be replaced.