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2-158 CM165C 26. Remove the oil-injection pump/water pump drive- shaft from the lower crankcase half. Account for the thrust washer on the outer end of the shaft. CM159A NOTE: Do not replace the inner seals unless the 27. Place the crankcase on the bench with the water pump side down. Using the long seal driver, drive the mechanical water pump seal from the crank- case. FC036 28. Using a pair of snap ring pliers, remove the snap ring securing the inner seal in the crankcase. 29. Using the hooked end of the tool, pull the inner seal free of the crankcase. 30. Using the hooked end of the tool, pry the seal ring from the backside of the water pump impeller. AN327D Cleaning and Inspecting Engine NOTE: Whenever a part is worn excessively, CYLINDER HEAD 1. Using a non-metallic carbon removal tool, remove any carbon buildup from the combustion chambers being careful not to nick, scrape, or damage the combustion chambers or the sealing surfaces. 2. Inspect the spark-plug holes for any damaged threads. Repair damaged threads using a heli-coil insert. 3. Inspect the cylinder head for flatness using a straightedge and a feeler gauge. Acceptable warpage must not exceed 0.05 mm (0.002 in.). NOTE: If the warpage exceeds specification, 4. Place the cylinder heads on a Surface Plate (p/n 0644-016) covered with #400 grit wet-or-dry sandpaper. Using light pressure, move each cylin- der head in a figure eight motion. Inspect the seal- ing surface for any indication of high spots. A high spot can be noted by a bright metallic finish. Cor- rect any high spots before assembly by continuing to move the cylinder head in a figure eight motion until a uniform bright metallic finish is attained. ! CAUTION Water or parts-cleaning solvent must be used in |