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9930588 R02 - 2017-2020 RZR 900 900/S 900/S4 1000/S 1000/S4 Service Manual
© Copyright Polaris Industries Inc.
3.97
2. Compress the valve spring by hand using valve
spring compressor adapter (PV-43513-A). Valve
spring compressor (PV-1253 or PV-4019 (Quick
Release)) can be used if desired to aid in removal.
3. Push down on spring and remove split keepers
e
.
4. Slowly release valve spring pressure and remove the
compressor adapter.
5. Remove the valve retainer
r
, valve spring
t
, valve
stem seal
y
and valve spring seat
u
. 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
i
out,
keeping it in order for reassembly in the same valve
guide.
7. Repeat the previous steps to remove the remaining
valves.
8. Clean the combustion chamber and head gasket
surface.
9. Check the condition of each valve spring. Replace if
wear or cracking is present on the spring.
VALVE INSPECTION
1. Remove all carbon from valves with a soft wire wheel
or brush.
2. Check valve face for runout, pitting, and burnt spots.
To check for bent valve stems, mount valve in a drill
or use “V” blocks and a dial indicator.
3. Check the end of the valve stem for flaring, pitting,
wear or damage.
4. Inspect split keeper groove for wear or flaring in the
keeper seat area.
NOTICE
The valves can be re-faced or end ground, if necessary.
They must be replaced if extensively worn, burnt, bent
or damaged.
ENGINE / COOLING SYSTEM
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