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4-16.See figure 4-1. Assemble "o" ring in groove on the in-side of magneto gear. Install gear in bushing of crankcase. Install magneto drive cushion retainer in the magneto gear. Assemble magneto drive cushions in retainer. In-stall magneto gasket and magneto. Install clamps, lockwasher, and 5/16 plain nut. Tighten slightly until the final timing is completed.
4-17. Timing Magneto to Engine. Rotate the crankshaft in direction of normal rotation until no. 1 cylinder is on the compression stroke and approximately 350 BTC. Clamp the ignition timing pointer (64697) on the advance timing mark on the rear of the starter ring gear. The starter ring gear may be marked at 20 and 25. Consult engine nameplate for correct advance timing mark to use. Con-tinue rotating the crankshaft until the timing pointer and the parting flange of the crankcase align. Leave the crankshaft in this position until the magneto is installed.
4-18. In the event that an igntion timing pointer is not available an alternate method may be used. Rotate the crankshaft in direction of normal rotation until no. 1 cylinder is on the compression stroke and continue rotating the crankshaft until the correct advance timing mark on the front of the starter ring gear is in exact align-ment with the small drilled hole located at the two o'clock position on the front face of the starter housing. Leave the crankshaft in this position until the magneto is installed.
NOTE

The advance timing mark is specified on the engine nameplate.
4-19. Remove the inspection plug from the magneto and rotate the drive shaft in direction of normal rotation until the painted chamfered tooth on the large distributor gear is aligned in the center of the inspection window. The shaft on the impulse coupling magnetos can be turned by depressing the pawl on the coupling. Be sure the magneto gear does not move from this position and secure each magneto finger tight. The magnetos are now ready for final timing.
4-20. Final Timing D-2000 Dual Magneto. Using a battery power timing light, attach the red lead of timing light to the left switch terminal, green lead of timing light to right switch, black lead to an unpainted portion of the engine. Rotate the magneto in its mounting flange to a point where the light comes on, then slowly turn it in the op-posite direction until the red light goes out. Tighten the magneto clamps evenly.
4-21. Back off the crankshaft approximately 10 so the timing light goes on. Bring the crankshaft slowly back in the direction of normal rotation until red light goes out. Indicating the left main breaker opening at no. 1 firing
OVERHAUL  MANUAL  LYCOMING  76  SERIES  AIRCRAFT  ENGINES  Section4 
IgnitionSystem 
position. The right main breaker monitored by the green light must open within + 2 engine degrees of the no. 1 fir-ing position. Completely tighten nuts to specified torque. 
4-22. Ignition Harness. Prior to inserting spark plug lead in plug barrel use flurocarbon spray MS-S122 (available from Miller-Stephenson Chemical Co., 16 Sugar Hollow Rd., Danbury, Conn. 06813). Assemble the leads into pro-per spark plug. Consult wiring diagram figure 4-3. Torque nuts to 110 -120 inch pounds. 
　
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