3.41
ENGINE
3
9923983 - 2012-2013 RZR 170 Service Manual
© Copyright 2012 Polaris Sales Inc.
Cylinder Head and Camshaft Installation
NOTE: Verify the gasket surfaces on the cylinder
head and cylinder are clean. Remove all traces of old
gasket material.
1. Install the dowel pin(s) and a new cylinder head
gasket over the cylinder studs.
2. Pull the cam chain through the cylinder head chain
room and secure with mechanic’s wire.
3. Place the cylinder head onto the cylinder.
4. Install the two 6 mm base bolts, but do not tighten at
this time.
5. Install the cam according to the “Cam Shaft Timing”
procedure. Verify the cam chain is in place around the
crankshaft gear.
NOTE: Verify camshaft timing is accurate before
installing the rocker and tensioner assemblies.
Camshaft Timing
IMPORTANT CAMSHAFT TIMING NOTE: In order to
time the camshaft to the crankshaft, the piston must be
precisely located at Top Dead Center (TDC). This can be
accomplished using one of two methods.
1. Install the cam chain over the crankshaft.
When the stator housing is removed, use Method 1. This
method uses the camshaft gear marks and the crankshaft
keyway to establish TDC (see Method 1 illustration). It is
important to note that this method can only be used when
the stator housing is removed and the crankshaft keyway
is in view. The camshaft sprocket alignment marks are
parallel to the gasket surface, and camshaft lobes are
pointing down. Cam chain plate links are not used to time
the camshaft.
When the stator housing is installed, use Method 2. This
method establishes Top Dead Center (TDC) by aligning
the single mark on the flywheel in the timing inspection
hole (see Method 2 illustration). The camshaft sprocket
alignment marks are parallel to the gasket surface, and
camshaft lobes are pointing down. Cam chain plate links
are not used to time the camshaft.
Camshaft Installation - Timing Method 1
Reference Illustration Page 3.43
Stator housing is removed. NOTE: Use this method only
when the stator is removed and cam shaft drive sprocket
is in view.
1. Rotate the crankshaft until the keyway on the
crankshaft is pointed ’UP” (keyway facing upward)
and the piston is at TDC.
2. Align the cam chain onto the teeth of the crankshaft
sprocket. Use a wire to pull the chain up through the
cylinder and cylinder head and to hold it in place.
Secure and maintain tension so that the chain does
not fall off the crankshaft sprocket.
3. Apply engine assembly lubricant to the camshaft main
journals and cam lobes. Lubricate automatic
compression release mechanism with clean engine
oil.
4. Orientate the camshaft for installation with the lobes
facing downward.
Serious engine damage will result if the
camshaft is not properly timed to the crankshaft.
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