Inspection; Cylinder Leak Test - Can-Am DS 450 2008 Shop Manual

Section 03 ENGINE
Subsection 07 (CYLINDER HEAD/CYLINDER)
Valve Clearance Adjustment
Adjust valve clearance by replacing the adjust-
ment shim of the respective valve.
NOTE: When replacing the adjustment shims,
crankshaft must be locked at ignition TDC.
Refer to appropriate procedures in this section to
remove the following parts:
– Timing chain tensioner
– Camshaft timing gears
– Camshaft
– Valve lifter bucket.
Remove adjustment shim and check its thickness
with a micrometer.
Choose the proper adjustment shim thickness to
reach the specified valve clearance.
New shim thickness =
Recorded valve clearance – Adjustment
specification + Old shim thickness
After parts reassembly, check again valve clear-
ance.
Install removed parts using their recommended
installation instructions.

INSPECTION

CYLINDER LEAK TEST

General
Before performing the cylinder leak test, verify the
following:
– Clamp(s) tightness
– Radiator and hoses condition.
NOTE: For best accuracy, the leak test should be
done with the engine at normal operating temper-
ature.
WARNING
Prevent burning yourself due to handling on
the hot engine.
Preparation
Remove the bottom spark plug. Refer to
TION SYSTEM
section.
VALVE COVER
Remove
section.
Bring the piston to TDC of compression stroke.
Refer to CRANKSHAFT LOCKING PROCEDURE
the CRANKCASE/CRANKSHAFT
90
IGNI-
. See procedure in this
in
section.
Leak Test
Install a gauge adaptor of the engine leak down
test kit (P/N 529 035 661) into previously cleaned
spark plug hole.
Connect the leak down tester to an adequate air
supply.
Set needle of measuring gauge to zero.
NOTE: All testers have specific instructions on
gauge operation and required pressure. Refer to
manufacturer's instructions.
Supply combustion chamber with air pressure.
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1. Gauge adaptor
2. Leak tester
3. Air supply hose
Gently tap on each valve lifter buckets to remove
carbon deposits from valves.
Note the amount or percentage of leakage (de-
pending on tester).
LEAKAGE
PERCENTAGE
0% to 15%
16% to 25%
26% to 40%
41% and higher
ENGINE
CONDITION
Excellent condition
Good condition
Fair condition; reduced
engine performance
Poor condition, diagnose
and repair engine
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