Sea-doo GTX Limited iS 255 2009, Shop Manual

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Section 02 ENGINE
Subsection 09 (COOLING SYSTEM)
GENERAL
During assembly/installation, use torque values
and service products as in the exploded view.
Clean threads before applying a threadlocker. Re-
fer to
SELF-LOCKING FASTENERS and LOCTITE
APPLICATION
at the beginning of this manual for
complete procedure.
WARNING
Torque wrench tightening specifications
must be strictly adhered to.
Locking devices (e.g.: locking tabs, elastic
stop nuts, self-locking fasteners, cotter pins,
etc.) must be replaced with new ones.
Hoses, cables or locking ties removed during a
procedure must be reinstalled as per factory stan-
dards.
SYSTEM DESCRIPTION
A closed loop cooling system is utilized on the
1503 4-TEC engines, which offers an efficient
engine cooling while keeping dirt and salt water
out of the cooling system. This system keeps
the temperature constant and prevents internal
engine corrosion.
A separate coolant expansion tank ensures that
enough engine coolant is in the circuit during any
operating condition.
The coolant flow comes from the water pump im-
peller into the cylinder block. It goes around the
cylinders and straight up to the cylinder head. A
smaller quantity of engine coolant enters the cylin-
der block on the exhaust side for a better cool-
ing. In the cylinder head the water channels flow
around the exhaust and then the intake valves and
leave the engine through a large hose. From there
the coolant goes back to the water pump hous-
ing and depending on the engine temperature, it
flows through the thermostat directly back to the
water pump impeller, or it takes its way through
the heat exchanger.
Engine coolant is also directed towards the oil
cooler (coolant type).
Coolant temperature sensor and bleed nipple are
located on the cylinder head.
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1. Bleed nipple
2. Coolant temperature sensor (CTS)
NOTICE
Never modify cooling system ar-
rangement, otherwise serious engine damage
could occur.
Technical Specifications
TYPE
Closed loop cooling
system.
COOLANT FLOW Flow from water pump.
TEMPERATURE
CONTROL
Thermostat.
SYSTEM BLEEDING
Self-bleed type through
expansion tank (hose at
uppermost point of circuit).
MONITORING
BEEPER
Turns on at 100°C (212°F)
on naturally aspirated
engines. Turns on at 110°C
(230°F) on supercharged
engines.
MAINTENANCE
ENGINE COOLANT
WARNING
To avoid potential burns, do not remove the
expansion tank cap or loosen the ride plate
drain plug if the engine is hot.
Recommended Coolant
Use
BRP PREMIXED COOLANT (P/N 219 700 362)
or
a blend of 50% antifreeze with 50% demineral-
ized water.
NOTE: Using a blend of 40% antifreeze with 60%
demineralized water will improve the cooling effi-
ciency when watercraft is used in particularly hot
weather and/or hot water condition.
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