4. If retreatment is necessary, the plugs should be allowed to cool for 20 minutes before returning to the vapor
cleaning tank (electrode ends down).
Exceptionally dirty spark plugs should be lowered directly into the
trichloroethylene for one minute, then removed and allowed to cool before returning to the vapor cleaning
position in tank.
Trichloroethylene vapors are toxic and should be vented by an air conditioning hood to atmosphere. Other equally good
commercial solvents can be used if handled with equal care.
III. Firing End Cavity - Cleaning
One of the most effective and economical ways of removing non-soluble combustion deposits from the spark plug firing
end cavity is by the use of an abrasive blast unit.
This unit operates with available shop compressed air and is
commercially obtainable with universal adapting features for all standard type aircraft spark plugs.
AC FINE WIRE AIRCRAFT SPARK PLUG CLEANER INSTRUCTIONS
MODEL AV11-1 AIRCRAFT SPARK PLUG CLEANER AND INDICATOR
Installation:
1. Bench position unit so as to b e conveniently located for spark plug cleaning and testing operations.
2. Attach (CL-107) water trap with opening marked "Outlet" to air inlet at rear of unit with furnished 1/4" pipe nipple
or street elbow.
3. Attach hood to rear portion of top casting with the two prepositioned screws.
4. Attach compressed air line to the water trap opening marked "Inlet".
Air pressure at the water trap must be at least 120 psig (150 psig more preferable). A "Globe" or "Gate" wheel
type shut off valve should be installed into the air line servicing the unit so air supply can be shut off when unit is
not in use.
5. Attach a ground wire (No. 16 or 18 size) to indicated transformer retaining
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