19. Check capacitors for looseness in magneto cover of harness assembly and for any physical damage.
Check capacitors for capacitance, series resistance, and leakage. Capacitance should be 0.34 to 0.41
microfarads. The use of a Bendix condenser tester, part number 11-1767-1, -2, or-3 or equivalent will
simplify this test. Replace defective capacitors and tighten securing nut to a torque of 60 to 70 inch-
pounds.
—NOTE—
Spring in capacitor outlet may cause an indication of a short to
ground if adapter lead is not used.
IMPULSE COUPLING
REMOVAL OF IMPULSE COUPLING
1. Using heavy gloves or shop cloth, grasp coupling body firmly to prevent internal spring from
unwinding suddenly. Pull outward on coupling body only enough to release it from cam assembly.
Keep coupling body close against cam and allow body to turn as spring unwinds. After one or two
turns, spring coils will wedge against projections on body, restraining spring from further unwinding.
2. Look into hole in body and note location of inner eye of spring where it engages with mating recess in
cam hub. Insert a screwdriver under spring end and pry spring eye out of recess. Remove body and
spring together. Uncoil spring from body and pry spring eye from body recess to disengage spring.
3. Thread protective cap of 11-702-1 puller securely on end of shaft. Engage puller over protective cap
and cam assembly with wide jaws of puller hooked under cam assembly as shown in figure 74-10.
4. Tighten puller handle to remove coupling from shaft. If coupling does not release with maximum hand
torque at puller handle, apply penetrating thread release compound between coupling and shaft. Then
while puller is still fully tightened, hold tip of hot heavy duty soldering iron in contact with hub of
coupling cam assembly. Solder wetting of tip at point of contact with cam hub will assist in heat
transfer to parts. Retighten puller after about a minute of heat application.
—CAUTION—
Do not strike puller with a hammer. If puller is struck with a
hammer main bearings must be replaced
5. Do not tighten puller handle further after coupling cam releases from shaft. This could damage
flyweight if flyweight is caught under woodruff key. Remove puller from shaft. Then while holding
both flyweight tips inward, lift cam from shaft, and remove woodruff key from rotor shaft.
INSPECTION OF IMPULSE COUPLING
1. Check clearance between each flyweight and each stop pin as follows:
a. Bend end of a stiff piece of wire into a right angle, 1/8 inch long.
74 - 12 - 00
Page - 74-12
Reissued: August 1, 1986
2J8
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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