Timing Chain Drive Gears - Can-Am DS 450 2008 Shop Manual

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1. Bearing screw
2. Chain tensioner guide
Timing Chain and Chain Tensioner
Guide Inspection
Timing Chain
NOTE: Check timing chain on camshaft timing
gear for excessive radial play.
Check chain links condition for wear or other dam-
age.
Measure timing chain length. Mark 21 pins on
chain and measure the distance at the outer di-
ameter of pins.
NOTE: Ensure to eliminate play in chain while
measuring.
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A. Timing chain length
TIMING CHAIN LENGTH (DISTANCE OF 21 PINS)
SERVICE LIMIT
If chain is out of specification, excessively worn
or damaged, replace it as a set (camshaft timing
gears, intermediate gear and timing chain).
Chain Tensioner Guide
Check the chain tensioner guide for wear, cracks
or other damage. Replace if necessary.
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165.2 mm (6.504 in)
Subsection 08 (CRANKCASE/CRANKSHAFT)
Timing Chain and Chain Tensioner
Guide Installation
The installation is the reverse of the removal pro-
cedure. However, pay attention to the following.
To adjust the camshaft timing correctly refer to
TIMING CHAIN DRIVE GEARS INSTALLATION
this section.
CAUTION: Improperly adjusted valve timing
will damage engine components.

TIMING CHAIN DRIVE GEARS

Timing Chain Drive Gears Removal
CAUTION: Crankshaft must be locked at TDC
of compression stroke, refer to CRANKSHAFT
LOCKING PROCEDURE above.
Remove:
– Valve cover
– Timing chain tensioner
– Timing gears and chain guide, refer to
DER HEAD/CYLINDER
– Primary drive gear, refer to the procedure above
– Timing chain.
Withdraw intermediate gear, needle bearing and
thrust washer of bearing pin.
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1. Intermediate gear
2. Needle bearing
3. Thrust washer
4. Bearing pin
Remove retaining screw and washer of control
gear.
Section 03 ENGINE
CYLIN-
in
119