Engine De-Preservation
long-term preservation of engines can result in trapping large amounts of oil in the combustion chambers of one or more cylinders. For this reason, engines should not be rotated until all of the preservative oil is drained away. Failure to do so can result in damage to the piston, connecting rod, and crankshaft of the flooded cylinder To return the aircraft to service - remove seals, tape, and desiccant bags. Use a solvent to remove tape residue. Remove spark plugs or dehydrator plugs. With the magnetos off, rotate the propeller by hand through sufficient rotations to remove excess preservative oil from the cylinders. Drain the remaining preservative through the sump. Most engines are equipped with a quick-drain oil fitting on one side of the oil sump and a standard AN plug on the other. Remove both in order to drain as much of the preservative oil from the sump as possible. Uninstalled engines should be hoist...