Crankshaft Inspection - Arctic Cat Cougar Service Manual

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replace damaged studs as described under Cyl-
inder Stud Replacement in this chapter.
6. Check the upper and lower crankcase halves
around the grooves for the oil seals and bearing
retaining rings (Figure 95 and 96) for cracks or
damage.
7. Inspect the seal and bearings for the coolant
pump and oil injection pump as described in this
chapter.
8. Check the machined surfaces of the coolant
pump on the lower crankcase half (Figure 98).
Check the surface for gouges or other damage
that would indicate damage.
9. Inspect the coolant pump as described in this
chapter.
10. If there is any doubt as to the condition of
the crankcase halves, and they cannot be re-
paired, replace the crankcase halves as a set.
Crankshaft Inspection
Do not remove any bearings that are pressed
onto the crankshaft unless new bearings are
available. Refer to Figure 99 for a typical crank-
shaft. A single roller bearing is used on some
models in place of the two ball bearings (2 and
4, Figure 99) shown.
1. Remove the crankshaft seals from each end
of the crankshaft. Even though the seals may
appear okay, they should be replaced when the
crankcase is disassembled to make sure the
crankcase is airtight when it is assembled.
2. Support the crankshaft on V-blocks so it can
be rotated while inspecting it.
3. Inspect the small end (Figure 70) and big end
(Figure 100) of each connecting rod for exces-
sive heat discoloration or bearing damage.
4. Spin each connecting rod by hand, while
checking for excessive noise or roughness.
5. Carefully examine the condition ofthe crank-
shaft main bearings (Figure 101). Clean the
bearings with solvent and dry with compressed
air. Do not allow bearings to spin while drying.
Oil each bearing, then check it by rolling each
CHAPTER FIVE
bearing by hand. Make sure that it turns quietly
and smoothly. There must not be any rough spots
or apparent radial play. Replace defective bear-
ings.
6. Inspect the drive gear (Figure 102) for
cracks, deep scoring or excessive wear. Check
the gear (Figure 103) on the coolant and injec-
tion pump driveshaft for damage. If either gear
is damaged, replace both gears. If the drive gear
is damaged, the crankshaft will have to be disas-
sembled or replaced; refer crankshaft disassem-
bly to a dealer or crankshaft specialist.
NOTE
The bearings installed on the outside of
the crank wheels can be replaced as
described under Crankshaft Bearing
Replacement in this chapter. To replace
the bearings, seals and center gear in-
stalled between the crank wheels, the
crankshaft must be disassembled. Refer