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24. 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.
NOTE: When replacing the inner water pump
seals, use the recommended Water Pump Bearing
and Seal Tool Kit only.
25. 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.
26. Using a pair of snap ring pliers, remove the snap
ring securing the inner seal in the crankcase.
27. Using the hooked end of the tool, pull the inner
seal free of the crankcase.
28. Using the hooked end of the tool, pry the seal ring
from the backside of the water pump impeller.
Cleaning and Inspecting Engine
NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is
necessary.
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.
3. Inspect the cylinder head for flatness using a
straightedge and a feeler gauge. Acceptable war-
CM159A
page must not exceed 0.002 in.
NOTE: If the warpage exceeds specification,
resurface the cylinder head using procedures
identified in step 4.
4. Place the cylinder heads on a Surface Plate cov-
ered with #400 grit wet-or-dry sandpaper. Using
light pressure, move each cylinder head in a figure
eight motion. Inspect the sealing surface for any
FC036
indication of high spots. A high spot can be noted
by a bright metallic finish. Correct any high spots
before assembly by continuing to move the cylin-
der head in a figure eight motion until a uniform
bright metallic finish is attained.
AN327D
FS270
41
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