Figure 74-8. Timing Light Connected to Magneto and Breakers
INTERNAL TIMING OF MAGNETO
1. Remove magneto cover.
2. Loosen flange clamps and remove magneto from engine.
3. Check condition of points; replace if necessary.
4. Rotate magneto drive shaft until a main cam lobe touches follower of left main breaker assembly and
adjust breaker points to an initial opening of 0.016 inch.
5. Adjust right main breaker contact assembly to an initial point opening of 0.016 inch as in step 4.
6. Bend fixed contact support to adjust clearance. If support is bent, main breaker contact must be
rechecked. Tighten breaker securing screws to a torque of-20 to 25 inch-pounds.
—CAUTION—
Bend bracket carefully. Do not correct by bending back if bent
too much; this weakens the bracket.
7. Position rotor so keyway is at 12 o’clock position and red painted distributor teeth are visible in timing
windows.
8. Loosen drive shaft nut and position rotor holding tool (Bendix part number 11-8465) under washer or
bushing on drive end of rotor shaft with clamp at 4 o’clock position so any shaft deflection caused by
clamping action will be in a plane parallel to breaker contacts. Tighten nut to secure holding tool to
shaft. Check to ensure proper location of keyway and tighten adjusting screw of holding tool to lock
rotor in position.
74 - 11 - 00
Page - 74-08
Reissued: August 1, 1986
2J5
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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