9. Install next two plugs for test and repeat above outlined procedures. Occasionally open air control needle valve
to the test chambers (without any plugs in place). The air flow will blow out any loose metallic thread particles
which could accumulate and possibly cause erratic test results by shorting or bridging the spark plug electrodes.
10. For Best Results:
Do not electric test any spark plugs until they have been degreased, firing end cavity cleaned, shielding barrel
cleaned, threads cleaned, and electrodes regapped to engine manufacturer's specifications.
If engine manufacturer's recommendations for spark plug gap sizes exceed .025, the electrode gaps should be
reset after electric testing.
Drain water trap.
If necessary, re-locate cleaner
Fogged viewing window
Excessive Moisture in
away from sump end of compressed
Broken viewing window
See replacement instructions.
Replace fuse or repair
High tension lead
Pull service cord from outlet
and replace H.T. lead in
No high tension spark
Replace switch type CL-104.
Unsolder wire leads and, looking at
rear of switch, un-screw switch from
knob in counter-clockwise direction.
Wrong terminal contactor
Use long contactor for 3/4" barrels,
or none used.
short contactor for 5/8" barrels.
Air not turned an.
Turn on air.
Air gouge does not
Replace gauge assembly
Clear Air Line.