4-12. Air Cleaner Housing Screw Hole Repair
Damaged or stripped air cleaner housing screw holes must be repaired to insure proper
s e a l i n g of the air cleaner door. I f damaged or stripped holes occur, p e r f o r m the
(1) Tools and Equipment Required
Drill Bit, letter size "X" (0.397)
Air-vat Vacuum Tool NSN 7910-00-807-3704
Dry Cleaning Solvent NSN 6850-00-281-1985
Tool kit, Coil Thread Insert: 3/8-16 UNC NSN 5180-00-935-0734
Tap and Reamer Wrench
Approved Eye Protection
(2) Repair. Perform the following to repair housing hole (fig. 4-26).
Wrap masking tape around tap provided in insert kit so that 1-inch of tap is
exposed below tape (view A).
Fabricate drill stop (view B).
Remove air cleaner filter element (TM-20).
Tape cardboard over air outlet port to prevent dust or drilling chips from
entering engine (view C).
Use approved eye protection during drilling operations to
prevent serious eye injury.
Using drill motor, drill, and fabricated drill stop, drill through stripped screw
U s e cutting oil on tap to prevent thread spalling and to
minimize tap breakage.
Using tap, tap wrench, and cutting oil, turn tap into drilled hole until tape
contacts housing surface.
Using vacuum cleaner, rags, and cleaning solvent, remove chips and cutting
oil from housing.