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10. Remove the bearing spacer (AC50F2 and
AE50A2 only) and the remaining PTO end
bearing using the instructions in steps 6-9.
Make note of any shims that were removed as
to thickness and position. The shims must be
replaced during assembly, otherwise. engine
damage may result.
Bearing Removal Tools
Item
Part No.
Usage
Bearing Puller Kit
0144-080
All Models
Bearing Puller
2000 and 3000
Shells
0144-114
Series
Bearing Puller
-
4000 and 5000
Shells
0144-115
Series
II
NOTE: The PTa and MAG side bearings are
identical in size and appearance but are
different in composition. Be sure to mark
bearings to ensure correct installation. New
bearings can be identified by box part number
only.
•
CAUTION
•
1.
To remove bearings from the MAG end of the
crankshaft, use a medium bearing puller or a
bearing splitter to separate the MAG bear-
ings enough to allow use of the Arctic
bearing puller.
II
NOTE: Be sure to place some type of
support under the bearings when using a
bearing splitter to prevent the crankshaft from
being damaged.
2.
Thread the flywheel nut onto the threaded
portion of the crankshaft so it is flush with the
end of the shaft. This will prevent damage to
the threads.
3.
Make a small drawing of the crankshaft and
bearings making special note of dowel pin
holes in bearings.
4.
Slide puller over end of crankshaft. Place
shells over bearings; then slide retaining ring
over shells.
5.
Tighten the puller bolt until the bearing
releases from the crankshaft taper. Remove
the remaining bearing using instructions in
steps 1-5.
6.
Separate the PTO side outer bearing using a
bearing splitter.
II
NOTE: Be sure to place some type of
support under the bearings when using a
bearing splitter to prevent the crankshaft from
being damaged.
7.
Install the protective dowel into the threaded
bore in the PTO end of the crankshaft.
8.
Install the bearing puller and shells around
the bearing; then slide the retaining ring over
the shells.
9.
Tighten the bearing puller bolt until the
bearing releases from the crankshaft taper.
38
Cleaning and
Inspecting
II
NOTE: Whenever a part is worn excessively,
cracked, defective or damaged in any way,
replacement is necessary.
Cylinder Head
1.
Remove any carbon buildup which has
collected in the combustion chamber. Use a
non-metallic tool to prevent scratching and
scoring of the combustion chamber.
2.
Thoroughly clean the cylinder head using
cleaning solvent.
3.
Place the cylinder head on a surface plate.
Move the head in a large circular motion.
Examine the sealing surface. The surface
must seat evenly. Any "high" areas will be
noted by a shiny finish on the sealing surface.
Fig. 4-74
Al0S
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