142
SNO-379
5. Install the impeller assembly into the housing and
secure using the existing circlip.
6. With the engine still at Top-Dead-Center (TDC),
install the water pump and secure using the existing
screws. Tighten to 8.7 ft-lb.
7. Fill the cooling system.
Pressure Testing Engine
NOTE: To pressure test the engine, use Engine
Leak-Down Test Kit.
Checking Compression
NOTE: Prior to this test procedure, verify the bat-
tery is fully charged and the console is positioned over
the support bracket with the hood/main harness
plugged in.
NOTE: This test must be done with the engine at
operating temperature and “full-cranking RPM” and
the decompression system active.
3000
NOTE: The engine should be warm (operating tem-
perature) and the battery fully charged for an accu-
rate compression test.
1. Remove the spark plug wires from the spark plugs.
2. Using compressed air, blow any debris from around
the spark plugs.
3. Remove the spark plugs; then attach the spark plug
wires to the plugs and ground the plugs on the cylin-
der heads well away from the spark plug holes.
4. Attach the Compression Tester Kit.
5. While holding the throttle in the full-open position,
crank the engine over with the electric starter until
the gauge stops climbing (five to 10 compression
strokes). Compression should be as shown in the
chart.
6. If compression is abnormally low, verify the follow-
ing:
A. Starter cranks engine over (normal speed).
B. Gauge is functioning properly.
C. Throttle in the full-open position.
D. Valve/tappet clearance correct.
E. Engine warmed up.
7. If compression is still low, check for blown cylinder
head gasket, valve leakage, or worn piston rings or
cylinder.
5000/9000
With the spark plugs removed, install the compression
tester gauge with adapter into the spark plug hole; then
with the throttle valve in the full-open position, crank the
engine over to get the psi reading. Compression should
be 120 psi.
7000
With the spark plugs removed, install the compression
tester gauge with adapter into the spark plug hole; then
with the throttle valve in the full-open position, crank the
engine over to get the psi reading. Compression should
be 213.3 psi
NOTE: Verify both cylinder compression readings
are within 10% of each other.
Changing Oil/Filter
3000
NOTE: Recycle or properly dispose of the used
engine oil.
NOTE: The access panels and hood must be
removed for this procedure.
1. Park the snowmobile on a level surface; then start the
engine and let it idle and warm up until the fan on the
radiator turns on, or if the snowmobile was operated,
allow the engine to idle for approximately 30 sec-
onds. Shut the engine off.
2. Remove the torx-head screws and the rear access
plate from beneath the snowmobile.
! WARNING
Always wear safety glasses when using compressed
air.
PSI (WOT)
Cylinder #1/Cylinder #2 185
CAUTION
Do not ground the spark plug on the cylinder head
cover. The cover is made of magnesium and any contact
with spark or electrical arc will severely pit the surface.
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