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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
2. Compress the valve spring by hand using valve
spring compressor adapter.
Valve Spring Compressor Adapter
PV-43513-A
3. Push down on the spring
e
and remove the split
keepers
q
.
4. Slowly release valve spring pressure and remove the
compressor adapter.
5. Remove the valve retainer
w
, valve spring
e
, valve
stem seal
r
and valve spring seat
t
. Discard the
valve seal.
NOTICE
Replace valve seals whenever cylinder head is
disassembled. Hardened, cracked or worn seals will
cause excessive oil consumption.
6. Lift up the cylinder head and push the valve
y
out,
keeping it in order for reassembly in the same valve
guide.
7. Repeat the previous steps to remove the remaining
valve.
8. Clean the combustion chamber and head gasket
surface.
CYLINDER HEAD INSPECTION
Thoroughly clean cylinder head surface to remove all
traces of gasket material and carbon.
IMPORTANT
Use care not to damage gasket sealing surface. All
gasket surfaces must be clean, dry and free of any oil
or grease upon assembly. Clean sealing surfaces with
rubbing alcohol or electrical contact cleaner. Do not
touch sealing surfaces of the new head gasket.
CYLINDER HEAD WARP INSPECTION
1. Lay a straight edge across the surface of the cylinder
head at several different points and measure warp by
inserting a feeler gauge between the straight edge
and the cylinder head surface. If warp exceeds the
service limit, replace the cylinder head.
MEASUREMENT
Cylinder Head Warp Limit:
.0024" (0.06 mm)
VALVE INSPECTION
1. Remove all carbon from valves with a soft wire wheel
or brush.
2. Check valve face for excessive runout, pitting, and
burnt spots.
ENGINE / COOLING SYSTEM
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