Removing Impulse Coupling - Piper Lance II Service Manual

805
0.015 MIN.
Figure 8-17. Removing Impulse Coupling
Figure 8-18. Checking Flyweight to
Stop Pin Clearance
8-32. IMPULSE COUPLING REMOVAL.
a. Using heavy gloves or shop cloth, grasp the coupling body firmly to prevent the
internal spring from unwinding suddenly. Pull outward on the coupling body only enough
to release it from the cam assembly. Keep the coupling body close against the cam and allow
the body to turn as the spring unwinds. After one or two turns, the spring coils will wedge
against the projections on the body, restraining the spring from further unwinding.
b. Look into the hole in body and note the location of the 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 the body and spring together. Uncoil spring from body and pry
spring eye from body recess to disengage spring.
c. 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 8-17.
d. 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 the tip
at point of contact with the cam hub will assist in heat transfer to the parts. Retighten
puller after about a minute of heat application.
CAUTION
Do not strike the puller with a hammer. If puller is struck
with a hammer the main bearings must be replaced.
Issued: 1/3/78
POWER PLANT
2B11
LANCE II SERVICE MANUAL