Piper Arrow IV, Maintenance Manual

Page: 648 / 752

I. Using a scribe or similar pointed tool, unbraid 3/8 inch of braided shielding. (Refer to Figure 74-
36.) Wrap a single thickness of electrical tape around unbraided strands to facilitate insertion of
lead end through hole in cable outlet plate.
J. Remove cable outlet plate from magneto. Support plate securely and, using suitable cutting pliers,
split and remove eyelets from leads adjacent to lead being replaced. When splitting eyelet make
certain that wire strands are not cut. Removal of eyelets on adjacent leads will allow grommet to
be pulled away from outlet plate to facilitate insertion of new lead.
K. Pass the taped end of new lead through hole in outlet plate. Remove electrical tape from lead and
install tapered end of ferrule under the unbraided strands of shielding. Form strands of shielding
evenly as shown in Figure 74-37 and pull lead assembly back through cable outlet plate until
ferrule binds in the outlet well. Position the Scintilla 11-7074 Ferrule Seating Tool (Figure 74-38)
over the wire and firmly seat the ferrule by tapping the seating tool with a hammer or by using an
arbor press.
L. Measure 1/2 inch from tapered ferrule and strip remaining insulation from wire. (Refer to Figure
74-40.)
M. Insert Scintilla 11-7073 Needle (Figure 74-39) through small hole of grommet and over stripped
end of wire. (Refer to Figure 74-41.) Slide grommet down needle until it seats tightly against the
tapered ferrule.
N. Cut wire 3/8 inch from top of grommet outlet. (Refer to Figure 74-42.) Double wire over as shown
in A of Figure 74-43. Slide eyelet over doubled wire until it is firmly seated in recess of grommet
outlet.
O. Using the “AB” groove of Scintilla 11-4152 Crimping Tool, or equivalent, crimp eyelet to wire.
Approximately 1/ 32 of an inch of wire should extend from end of eyelet after crimping. (Refer to
B of Figure 74-43.)
—NOTE—
If the crimping tool is not available, a satisfactory connection can
be made by soldering with Kester Flux 709 or equivalent and a
non-corrosive solder. After soldering, clean solder joints using
denatured alcohol.
P. Install clamps and cable ties as necessary to secure lead to the engine.
INSTALLATION OF HARNESS.
Before installing harness on magneto, check mating surfaces for cleanliness. Spray entire face of grommet
with a light coat of Plastic Mold Spray, SM-O-O-TH Silicone Spray or equivalent. This will prevent harness
grommet from sticking to magneto distributor block.
l. Place the harness terminal plate on the magneto and tighten nuts around the plate alternately to seat
cover squarely on magneto. Torque nuts to 18 to 22 inch-pounds.
2. Route ignition wires to their respective cylinders.
3. Clamp the harness assembly in position.
4. Connect the leads to the spark plugs.
Effectivity 74-21-03
PA-28RT-201 Page 74-35
December 1, 1978
3E20
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL