Polaris Sportsman 400, Service Manual

Page: 81 / 381

ENGINE
3.12
CRANKSHAFT STRAIGHTENING
Lubricate the bearings and clamp the crankshaft securely in the holding fixture. Refer to the illustrations below.
NOTE:The rod pin position in relation to the dial indicator position tells you what action is required to straighten
the shaft.
1. To correct a situation like the one shown in the
illustration at right, strike the shaft at point A with a
brass hammer.
2. To correct a situation like the one shown in the
illustration at right, squeeze the crankshaft at
point A. (Use tool from alignment kit).
3. If the crank rod pin location is 180
_
from the dial
indicator (opposite that shown above), it will be
necessary to spread the crankshaft at position A
as shown in the illustration at right.
When
rebuilding and straightening a crankshaft, runout
must be as close to zero as possible.
NOTE:Maximum allowable runout is .0024 I .
Crankshaft Alignment Fixture
PN 2870569
A
B
HIGH .004 (.1mm)
HIGH .004 (.1mm)
SUPPORT CRANKSHAFT
HERE.
A A
HIGH .002 (.05mm)
HIGH .005 (.13mm)
A
HIGH .002 (.05mm)
HIGH .005 (.13mm)
A