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8-22. Mixture Adjustment. With the engine operating at the idle speed as previously set, move the mixture control lever with a smooth steady pull into the idle cut-off posi-tion and observe the tachometer for any change in RPM during the leaning process. Caution must be exercised to return the mixture control level to "Full Rich" before the RPM can drop to a point where the engine cuts out. An in-crease of more than 50 RPM while "leaning out" indicates an excessively rich mixture. A decrease in RPM (if not preceded by a momentary increase) indicates that the mixture is too lean.
8-23. If it is indicated that the mixture is either too lean or too rich, turn the idle mixture adjustment in the direction required for correction. Check this setting by repeating the procedure in paragraph 8-21. Each time the adjust-ment is changed, it is necessary to run the engine for a short time at 2000 RPM to clear the engine out before pro-ceeding with the idle speed check. The final adjustment of the idle speed should be made with the throttle closed against the idle stop.
8-24. Preservation and Storage. In the event the engine is to be stored at the completion of the run-in the engine should be preserved in the following manner.
8-25. Upon completion of the run-in, drain the oil. Refill the engine with a 1 to 1 mixture of MIL-C-6529, Type 1, and Bayol "D" or equivalent.
8-26. Remove top spark plugs, and with the crankcase full of oil, slowly turn the propeller through two (2) revolu-tions.
OVERHAUL MANUAL

LYCOMING 76 SERIES AIRCRAFT ENGINES Section8
TestProcedure
Let engine stand for ten (10) minutes after which the pro-peller should be turned back and forth through 90 for twelve (12)cycles. Drain the preservative oil.
8-27. Spray the exhaust port and valve of each cylinderwith the piston approximately 1/4 turn before top center of the exhaust stroke using MIL-C-6529 oil, Type 1.
8-28. Spray each cylinder with an airless spray gun(Spraying System Company "Gunjet" model 24A-8395 or equivalent) through the spark plug holes with MIL-
C-6529oil, Type 1. Spray approximately two (2)ounces of oil into each cylinder.
8-29. For all spraying the spray nozzle temperature shall be maintained between 200°F. and 220°F.
NOTE In the event an airless spray gun is not available, it is recommended that a moisture trap be installed in the air line of the conventional spray gun and the oil shall be 200°F. to 220°F. at the nozzle.
8-30. Seal the breather openings with oil and moisture resistant caps or dehydrator plug, P/N 40238 or AN4062-11.
8-31. All accessory drives for which oil seals are providedshall be liberally coated with MIL-C-6529 oil, Type 1, before applying the drive covers.
8-32. Engines shall have spark plugs installed in the bot-tom cylinder location and dehydrator plugs, P/N 40238in-stalled in the upper cylinder location. The ignition harness shall be attached to the spark plugs in the bottom loca-tions and have ignition cable protectors (AN-4060)on the top locations.
　
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