Section 08
COOLING SYSTEM
Subsection 02
(CIRCUIT, COMPONENTS AND CARE)
SMR2002-080_08_02A.FM
08-02-13
1503 engines
CIRCUIT
Closed Loop System
A closed loop cooling system is utilized on the
1503 4-TEC engines, which offers an efficient en-
gine cooling while keeping dirt and salt water out
of the cooling system. This system keeps the tem-
perature 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 coolant pump
impeller into the engine block. It goes around the
cylinders and straight up to the cylinder head. A
smaller quantity of engine coolant enters the en-
gine block on the exhaust side for a better cooling.
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 housing
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 ride plate which operates as a heat exchanger.
A smaller quantity of engine coolant is also direct-
ed towards the oil cooler, which is located under
the air intake manifold, to increase cooling effi-
ciency.
Coolant temperature sensor and bleed nipple are
located on the cylinder head.
1. Bleed nipple
2. Coolant temperature sensor (CTS)
CAUTION:
Never modify cooling system arrange-
ment, otherwise serious engine damage could
occur.
Pressure Cap
Check if cap pressurize the system. if not, install
a new 90 kPa (13 PSI) cap (do not exceed this pres-
sure).
COOLING SYSTEM LEAK TEST
Install test radiator cap (P/N 529 021 400) and hose
pincher (P/N 295 000 076) on overflow hose. Pres-
surize all system through coolant expansion tank
to 90 kPa (13 PSI).
1. Hose pincher
2. Pressure pump (P/N 529 021 800)
Check all hoses, ride plate, engine and oil cooler for
coolant leaks. Spray a soap/water solution and look
for air bubbles.
Remove hose pincher and test pressure cap.
Open Loop system
The water supply is provided by a pressurized area
in the jet pump between the impeller and venturi.
The water flow is controlled by a reducer located
between the jet pump support and the jet pump
on the inlet side. The reducer is black on the 4-TEC
models.
1
F18E0XA
2
WARNING
To prevent burning yourself, do not remove
the expansion tank cap or loosen the ride-
plate drain plug if the engine is hot.
1
2
F18E1IA
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Содержание GTX 4-TEC 5573 2002
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