3.174
9928485 R01 - 2017-2018 RANGER 500 / 570 Service Manual
© Copyright Polaris Industries Inc.
VALVE SEALING TEST
1. Clean and dry the combustion chamber area
q
.
2. Pour a small amount of clean solvent into each
intake port
w
and check for leakage around the
valves. The valve seats should hold fluid with no
seepage.
3. Repeat for exhaust valves by pouring fluid into each
exhaust port
e
.
VALVE CLEARANCE CHECK / ADJUSTMENT
NOTE
Always inspect valve clearance prior to camshaft
installation or final engine assembly.
1. Install the cam chain guides and cam chain before
camshaft installation (if removed) as outlined in this
chapter.
2. Reference the camshaft intake
q
and exhaust
w
markings made during disassembly. If installing new
camshafts or if camshafts were not marked, you can
reference the part number stamped on the end of the
shafts.
3. Lubricate the camshaft bearing journal surfaces with
Polaris PS-4 engine oil prior to installation.
4. Carefully install the camshafts into the cylinder head.
The camshaft lobes should face out.
5. Carefully install the camshaft carrier onto the
camshafts.
6. Install the upper cam chain guide and the eight bolts
that retain the camshaft carrier.
ENGINE / COOLING SYSTEM
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