Section 09 COOLING SYSTEM
Subsection 01 (CIRCUIT, COMPONENTS AND CARE)
CIRCUIT
CAUTION: All hoses and fittings of the cooling
system have calibrated inside diameters to as-
sure proper cooling of the engine. Always re-
place using appropriate Bombardier part num-
ber.
717 Engines
A serial cooling system is utilized on the 717 en-
gines, which offers an efficient cooling of the com-
bustion chamber to prevent the possibilities of
detonation.
The water supply is taken from a pressurized area
in the jet pump between the impeller and venturi.
Water enters the cylinder head, cooling the com-
bustion chamber to prevent detonations. Then,
water exits cylinder head toward tuned pipe.
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3
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4
1. Cylinder head cover
2. Fresh water from jet pump
3. Water exiting head assembly to tuned pipe, exhaust
manifold and cylinders
4. Water from cylinder water jackets exiting engine
The tuned pipe and exhaust manifold are designed
with a double wall to allow water circulation.
Water is pre-heated by the exhaust system before
entering the cylinder cooling jackets.
Water enters cylinder cooling jacket through pas-
sages located below exhaust ports from tuned
pipe.
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1. Water passages
No water enters crankcase.
When engine is running, water must flow from
bleed outlet indicating that water circulates.
CAUTION: When investigating for no water
flow in the cooling system, check all elbows
and straight fittings as well as all hoses for
blockage.
For a minimum back pressure in the exhaust, en-
gine water outlet hose is not connected to the ex-
haust. It has its own outlet at the rear of the hull.
Draining of the cooling system is accomplished
by a drain hose located at the lowest point of the
circuit.
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717 ENGINES
1. Drain hose
smr2004-Complete Line Up 473
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