Camshaft Chain And Sprockets Inspection - Polaris 1999 Sportsman 400 Service Manual

132
CAUTION
The sl otted nut has left-ha nd threads.
Tum the sp ecia l wrench cl ockwise to
loosen the mil.
10. Install the special tool (Fig ure 151) onto the
slotted nut. Press hard on the tool to engage the tool
tabs into the nutslots. Tum thespecial tool
clockwise
and loosen the slotted nut. Remove the special tool.
I I. Unscrew
and remove the slotted nut (Figure
152).
12. Slide the drive sprocket (Figure 153) off the
crankshaft, then remove the Woodruff key (Figur e
154) from the crankshaft.
Inspection
1.
Clean the chain and sprockets in solve nt and
thoroughly dry.
2. Place the chain on a flat surface and pull the
chain tight with no slack between the pins, exerting
approximately 4.53 kg (10 lb.) force.
3. Measure the length of any 20-pitch section with
a vern ier caliper (Figure 155). Measure at several
locations on the chain, as a chain usually does not
wear equally.
4. If the length o f 20 pitches exceeds 13.7 em
(5.394 in.) (Figure 156), replace the chain and
sprockets.
CAUTION
Never install a new drive or driven
sprocket or a new chain without re-
placing all three comp onents as a set.
(/ only one of the components is re-
p/aced.
it
will wear out prematurely.
5. Inspect both the drive (A, Figure 157) and
driven (Figure 158) sprocket teeth for wear or other
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