Piper COMANCHE PA-24-180 Service Manual page 422

PIPER COMANCHE SERVICE MANUAL
A".
PAINTED LINE ON DISTRIBUTOR BLOCK
w
PAINTED LINE ON DISTRIBUTOR FINGE
FIGURE 7B-12. ALIGNMENT OF CAM IN INSPECTION HOLE
NOTE
Be sure the Timing Pointer does not move on the rotor shaft after it has
been aligned with the full register position timing mark.
f.
Turn rotor shaft in direction of rotation until timing line of Timing Pointer is directly over timing
mark for main contact assembly point opening Tighten adjusting knob so rotor cannot turn but not tight
enough to cause damage to drive end bearing
g
Install main contact assembly and tighten pivot screw. Turn cam until files notch on cam is
approximately
in center of hole marked "T". (Refer to Figure 7B-12.) Then continue turning cam in
direction of rotation until cam follower of main contact assembly is on high point of cam lobe Set contact
clearance to 0.019 + 0.001. Torque secunng screws to 20-25 lb. in. and pivot screw to 12-15 lb. in.
h. Turn cam until notch on cam flange is approximately aligned with screw hole nearest hole marked
"T". Connect the 11-851 Timing Light, or equivalent. across main contact assembly. Turn cam in direction
of rotation slowly until timing light goes our (contact points open). While holding cam in this position,
tighten cam securing nut. Be sure cam does not move while tightening nut Torque nut to 20-25 lb. in Be
sure timing light is still our
i.
Check that the Timing Pointer is over timing mark for main contact assembly point opening.
Loosen adjusting knob of the Rotor Holding Tool and turn shaft until Timing Pointer is aligned with
scribed line for retard contact assembly point opening. Tighten adjusting knob of Holding Tool enough to
hold rotor in this position.
j.
Install retard contact assembly and tighten pivot screw. Using the 11-851 Timing Light, set contact
points to open at this point Torque securing screws to 20-25 lb. in. and pivot screw to 12-15 lb. in. Loosen
adjusting knob of Holding Tool. Turn rotor in direction of rotation until cam follower of retard contact
assembly is on high point of cam lobe. Check contact clearance. It must be from 0.018 to 0.023 inch. If
clearance does not fall within limits, replace the contact assembly.
k. Apply a stripe of glyptal. any color, across cam retaining nut and distributor
rotor mounting
surface.
POWER PLANT
ISSUED: 8/18/72
2 F16