3.45
ENGINE / COOLING SYSTEM
3
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
6. Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again (take
six measurements total). Compare to specifications.
7. Measure valve guide inside dia
meter at the top middle
and end of the guide using a small hole gauge and a
micrometer. Measure in two directions.
8. Be su re to mea sure each guide a nd valve
combination indiv
idually.
NOTE: The valve guides cannot be replaced.
Combustion Chamber Cleaning
1. Clean a ll accumulated car bon dep osits fro m
combustion chambers and valve seat area.
NOTE: Carbon Clean Fu el Tre atment (2 871326) can
b
e used to help remove carbon deposits.
IMPORTANT: Do not u se a met al scr aper, a co arse
wire
brush or abrasive cleaners to clean the cylinder
head. Damage may result.
2. Visually inspe ct cylinde r head g asket su rface and
com
bustion chamber for cracks or damage. Pay close
attention to the areas around sp ark p lug and va lve
seats.
Valve Stem Diameter:
Intake: 0.2155" - 0.2161" (5.475 - 5.490 mm)
Exhaust: 0.2147" - 0.2153" (5.455 - 5.470 mm)
Valve Guide I.D.:
0.2165" - 0.2171" (5.500 - 5.515 mm)
Wear eye protection during combustion
chamber cleaning.
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