Piper SARATOGA PA-32-301 Maintenance Manual page 523

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
5. Inspect for excess radial wear between the flyweight and axle using the 11-10041 flyweight gauge.
Insert the gauge between flyweights and against cam hub as shown in Figure 74-14. If the gauge cannot be
inserted easily, remove burr from edges of hub keyway with a small file. Hold the gauge firmly against the hub.
at the same time squeezing the flyweights against the gauge. If the innerend of either flyweight heel touches the
gauge. replace the cam assembly. If parts are near limits, check clearance between flyweight and gauge with a
003 inch feeler. If flyweight heel is tight on feeler, replace the cam assembly.
-CAUTION
-
Never attempt to repair any part of a rejected cam and flyweight
assembly.
6. Inspect ears of the coupling body for grooves worn by the tail of the flyweights and wear at the
triggering ramp and cam stop contact areas. (Referto Figure 74-15.) If either ear shows a perceptible groove or
a ridge can be felt when fingernail is drawn across the surface, replace the coupling body.
7. Inspect drive lugs of body. If wear is noted. measure difference between worn and unworn areas on
drive lug surface. If difference is in excess of .015 of an inch. replace the body.
8. With spring released and free. it should form a smooth spiral curve with no sharp bends or flat spots.
(Refer to Figure 74-16.) If spring is deformed, replace it.
9. Inspect spring for cracks particularly at the ends and around spring eyes. Inspect coils of spring for
excessive wear. If grooves or ridges and worn in coils or cracks are found, replace spring.
10. Inspect the housing for cracks. stripped threads or other damage. Replace if necessary.
INSTALLATION OF IMPULSE COUPLING.
1. Check mating cam assembly and body for magnetization which would present flyweights from
engaging. Hold the assembly as shown in Figure 74-17 and push upper flyweight against body. When released.
flyweight must drop down, If flyweight sticks to body. parts are magnetized and coupling may not function.
Perform test on both flyweights.
2. To demagnetize. place body over shaft of a charged rotating magnet and spin body rapidly by hand.
While body is still spinning, invert magnet so body falls off. Catch body in hand and repeat test for
magnetization.
3. Clamp one drive lug of the body in a padded jaw vise with the spring recess side up.
4. Orient the spring with the body for correct rotation. On clockwise couplings, the spring must coil in a
clockwise direction from the outside toward the center when viewed from the spring recess side of the body.
(Refer to Figure 74-18.) Insert eye of outer end of spring into hole drilled in inner rim of body.
5 Using heavy gloves to protect the hands. wind spring into body manually. lifting spring coils one at a
time over projections on body. Extreme care should be used to avoid scratching or nicking the spring. After
winding the spring, brush a coating of light oil over the spring coils.
6. Pry up one and one-half turns at the inner end of the spring with a small screwdriver and support in
position as shown in Figure 74-19.
7. Engage recess in the hub on the cam assembly with eye at inner end of spring. With eve engaged.
rotate cam assembly slightly in direction to unwind spring to permit hub of cam to slip into the inner turn ofthe
spring. Rotate the cam in the opposite direction, winding spring slightly, until projections on edge of cam clear
over the projections on the body. Push the cam assembly down into the body. at the same time taking the
screwdriver out.
74-10-08
Page 74-16
2K16
Revised: August 9. 1984
2K16