7. Engage recess in hub on cam assembly with eye at inner end of spring. With eye engaged, rotate cam
assembly slightly in direction to unwind spring to permit hub of cam to slip into inner turn of spring.
Rotate cam in opposite direction, winding spring slightly, until projections on edge of cam clear over
projections on body. Push cam assembly down into body, at same time taking screwdriver out.
8. Insert a spare rotating magnet, with woodruff key in taper, into cam assembly. Turn magnet slightly in
direction of coupling rotation (to wind spring). Lift magnet with cam only enough to clear projections
on the body. Wind spring one-half turn and re-engage cam assembly into body.
9. Tension of spring assembly in assembled coupling when wound to point of impulse tripping must not
be less than 9 or more than 15 inch-pounds.
DISTRIBUTION
IGNITION HARNESS
INSPECTION OF HARNESS
1. Inspect cover for cracks or other damage. Inspect lead assemblies for abrasions, mutilated braid or
other physical damage.
2. Inspect grommets for tears and eyelets for spark erosion.
3. Disconnect harness coupling nuts from spark plugs and extract lead terminations. Inspect contact
springs and compression springs for any damage or distortion. Inspect sleeves for cracks or carbon
tracking.
4. Inspect coupling nuts and elbow assemblies for damaged threads or other defects. Replace any
damaged components per instructions in Maintenance of Harness.
5. Test continuity of each harness lead with a High Tension Lead Te s t e r, part number 11-8888 or
11-88888-1 from Bendix as follows:
a. Connect black test lead to contact spring and red lead to eyelet of same lead. (Refer to figure
74-20.)
b. Observe that continuity lamp illuminates.
6. Test insulation resistance of each harness lead by using 11-8888 or 11-8888-1 tester as follows:
a. Attach red high voltage test lead to contact spring of harness lead. (Refer to figure 74-21.)
b. Attach black test lead to ferrule of same harness lead. (Refer to figure 74-21.)
c. Depress PRESS-TO-TEST pushbutton switch.
d. Observe that indicator lamp flashes and GAP fires simultaneously as long as PRESS-TO-TEST
switch is held depressed. Whenever indicator lamp flashes and GAP fails to fire, lead under test is
defective and must be replaced.
74 - 21 - 00
Page - 74-18
Reissued: August 1, 1986
2J14
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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