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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-
page must not exceed 0.002 in.
NOTE: If the warpage exceeds specification,
resurface the cylinder head using procedures
identified in step 4.
FC036
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.
AN327D
Water or parts-cleaning solvent must be used in con-
junction with the wet-or-dry sandpaper or damage to
the sealing surface may result.
Cylinders
1. Using a non-metallic carbon removal tool, remove
carbon buildup from the exhaust ports.
2. Wash the cylinders in parts-cleaning solvent.
3. Inspect the cylinders for pitting, scoring, scuffing,
and corrosion. If marks are found, repair the sur-
face with a Ball Hone (p/n 0644-292) and honing
oil.
NOTE: To produce the proper 45° crosshatch pat-
tern, maintain a low drill RPM. If honing oil is not
available, use a lightweight, petroleum-based oil.
Thoroughly clean the cylinders after honing using
detergent soap and hot water and dry with com-
pressed air; then immediately apply oil to the cyl-
inder bores. If a bore is severely damaged or
gouged, the cylinder must be replaced.
CAUTION
FS270
CM018
43
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