Polaris Sportsman 400, Service Manual

Page: 92 / 381

ENGINE
3.23
AUTOMATIC COMPRESSION RELEASE REMOVAL/INSPECTION
NOTE: The automatic compression release mecha-
nism can be inspected and serviced without removing
the camshaft from the cylinder head. The actuator ball
in the camshaft is not replaceable. Replace the cam-
shaft as an assembly if the actuator ball is worn or dam-
aged.
1. Check release lever shaft for smooth operation
throughout the entire range of rotation. The spring
should hold the shaft weight against the stop pin.
In this position, the actuator ball will be held
outward in the compression release mode.
2. Remove release lever shaft and return spring.
3. Inspect shaft for wear or galling.
4. Inspect lobe on end of release lever shaft and
actuator ball for wear and replace if necessary.
AUTOMATIC COMPRESSION RELEASE INSTALLATION
1. Slide spring onto shaft.
2. Apply engine oil to release lever shaft.
The actuator ball must be held outward to allow instal-
lation of the release lever shaft.
If Camshaft Is Removed From Engine:
3. Turn the camshaft until the actuator ball is in the
lowest position and install the release lever shaft.
If Camshaft Is Installed In The Engine:
4. Use a small magnet to draw the actuator ball
outward, or rotate the engine until the cam lobes
face upward and install release lever shaft.
5. Position camshaft as shown at bottom of
illustration at right.
6. Place arm of spring under stop pin as shown and
push release lever inward until fully seated. Do not
pre-wind
the spring one full turn or the
compression release will not disengage when the
engine starts. Check operation of mechanism as
outlined in step 1 of Removal (above).
NOTE: When shaft is properly installed, actuator
ball will be held in the “out” position. It is important
to note that spring pressure is very light.
Spring in relaxed position
Stop pin