PIPER CHEROKEE SERVICE MANUAL
01/31/08
VIII - POWER PLANT (PA-28)
2L7
8-34. TIMING PROCEDURE. (Internal Timing) (-20 and -200 Series Magnetos)
When installing new or adjusting breaker points and before timing the magneto to the engine, it is
important that the internal timing of the magneto be correct.
NOTE: Verify correct engine timing for the airplane being worked on by checking the engine dataplate.
a. To internally time the -20 series and the early -200 series magnetos without the case in timing
marks, the magneto should be removed from the engine to determine “E” gap.
b. To determine “E” gap, find neutral position of the magneto drive by rotating drive coupling in a left
hand direction until the red or white chamfered tooth on the distributor drive gear appears through
the timing inspection hole. At the same location, the drive should feel to have fallen into a notch or
neutral position.
c. With timing plate and pointer attached. (Refer to Figure 8-17.) and pointer set at zero, rotate
coupling from neutral in a left hand direction 10 degrees. Appearing through timing hole, ascertain
if the white or red tooth aligns with the white line of the distributor block. (Refer to Figure 8-16.)
Alignment may not vary over ± 4 degrees.
NOTE: A timing kit, including timing plate, etc. may be purchased through the engine or magneto
manufacturer. A pointer may be formed as shown in Figure 8-17.
Figure 8-16. Magneto Timing Marks
Figure 8-17. Timing Pointer
Summary of Contents for Cherokee 140 PA-28-140
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