5.4
Engine Systems
9923396 - 2007-2012 EDGE/Widetrak LX Service Manual
©2011 Polaris Sales Inc.
Crankshaft Runout Inspection
1. Support the crankshaft in a set of “V” blocks as shown.
2. Use a dial indicator to measure the runout at the
following locations:
• PTO end = First taper after bearing flat.
• MAG end = 1/2" from bearing flat.
3. Runout deflection cannot exceed .0025" (.07mm).
4. If the runout deflection exceeds the maximum
specification, crankshaft trueing may correct the
deflection.
Piston Inspection
Check piston for scoring or cracks in piston crown or pin
area. Excessive carbon buildup below the ring lands is an
indication of piston, ring or cylinder wear. On Fuji engines,
measure piston outside diameter at a point that is 1/2"
(12.7mm) up form the bottom of the skirt at a 90° angle to
the direction of the piston pin.
Subtract this measurement from the minimum cylinder
measurement (90° to the pin). If clearance exceeds the
service limit, the cylinder should be re-bored (replaced if
Nicasil-lined) and new pistons and rings installed.
Taper Limit = .002" (.051mm)
Out-of-Round Limit = .002" (.051mm)
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