Piper PA-32R-301T SARATOGA S, Maintenance Manual

Page: 757 / 956

7. Remove the magneto drive gear backlash by turning the propeller opposite to normal rotation approxi-
mately 40° past the No. 1 firing position. Then turn the propeller in the direction of normal rotation up
to the No. 1 firing position of 20° BTC.
8. Remove the timing window plug from the most convenient side of the magneto housing. Also,
remove the plug from the rotor viewing window in the center of the housing.
9. Turn the rotating magnet drive shaft in the normal direction of magneto rotation until the red distribu-
tor tooth is centered in the timing hole. Also, check to ensure that the built-in pointer just ahead of the
rotor viewing window aligns with the R or L mark on the rotor depending on whether the magneto is
for right or left hand rotation as specified by the magneto data plate.
10. While holding the magneto in its No. 1 firing position (tooth in window center and pointer over R or
L mark on rotor), install the magneto to the engine and loosely clamp in position.
– NOTE –
Engine should be in No. 1 firing position of 20° cylinder
BTDC.
11. Attach red lead from the 11-9110 timing light to the left switch adapter lead, the green timing light
lead to the right switch adapter lead and the black timing light lead to the magneto housing. (Refer to
Figure 4.)
– NOTE –
An internal timing tolerance is allowed when adjusting the two
main breakers. Therefore, one of the main breakers may open
slightly before the other. Magneto-to-engine timing should be
accomplished using the first main breaker to open as a refer-
ence point when the engine is in the firing position for the No.
1 cylinder. This will ensure that ignition created by either
spark plug will not occur prior to the desired engine firing
point.
Timing Marks on Magneto Rotor
Figure 5
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
74-10-00
Page 74-7
Reissued: July 1, 1993
4B9