Jeep Grand Cherokee WK. Manual — part 206
ENGINE
TABLE OF CONTENTS
page
page
COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
DIAGNOSIS AND TESTING - COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
CONTAINER-COOLANT RECOVERY
. . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . . . . . . . . . 33
FAN-RADIATOR
. . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
. . . . . . . . . . . . . . 36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
. . . . . . . . . . . . . . . . . . . . . . . . . . 37
. . . . . . . . . . . . . . . . . . . . . . 38
SOLENOID-RADIATOR FAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
. . . . . . . . . . . . . . . . . . . . . . . . . 39
HEATER-ENGINE BLOCK
. . . . . . . . . . . . . . . . . . . . . . . . . 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . 40
DIAGNOSIS AND TESTING - ENGINE BLOCK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
. . . . . . . . . . . . . . . . . . . . . . . . . 41
. . . . . . . . . . . . . . . . . . . . . . . . . 41
. . . . . . . . . . . . . . . . . . . . . . . . . 42
. . . . . . . . . . . . . . . . . . . . . . . . . 43
SENSOR-ENGINE COOLANT TEMPERATURE
. . . . . . . . . . . . . . . . . . . . . . . . . 43
. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
. . . . . . . . . . . . . . . . . . . . . . . . . 44
. . . . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
. . . . . . . . . . . . . . . . . . . . . . . . . 46
. . . . . . . . . . . . . . . . . . . . . . . . . 47
THERMOSTAT-ENGINE COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . 47
. . . . . . . . . . . . . . . . . . . . . . . . . . . 48
DIAGNOSIS AND TESTING - THERMOSTAT
. . . . . . . . . . . . . . . . . . . . . 48
. . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . 50
VISCOUS CLUTCH-FAN DRIVE
. . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . . . 51
DIAGNOSIS AND TESTING - VISCOUS FAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
. . . . . . . . . . . . . . . . . . . . . . . . . 52
. . . . . . . . . . . . . . . . . . . . . . . . . 53
RADIATOR
. . . . . . . . . . . . . . . . . . . . . . . . . 53
. . . . . . . . . . . . . . . . . . . . . . . 54
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
. . . . . . . . . . . . . . . . . . . . . . . . . . 56
. . . . . . . . . . . . . . . . . . . . . . . 56
MOTOR-RADIATOR FAN
DIAGNOSIS AND TESTING—ELECTRIC
. . . . . . . . . . . . . . . . . . . . . . . . 56
PUMP-WATER
DESCRIPTION - WATER PUMP - 4.7L
DESCRIPTION - WATER PUMP BYPASS
WATER PUMP BYPASS – 3.7L/4.7L ENGINE
DIAGNOSIS AND TESTING - WATER PUMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
. . . . . . . . . . . . . . . . . . . . . . . . . 61
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
. . . . . . . . . . . . . . . . . . . . . . . . . . 62
. . . . . . . . . . . . . . . . . . . . . . . . . 62
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
. . . . . . . . . . . . . . . . . . . . . . . . . 64
7 - 30
ENGINE
WK
CAP-RADIATOR PRESSURE
. . . . . . . . . . . . . . . . . . . . . . . . . 65
. . . . . . . . . . . . . . . . . . . . . . . . . . . 65
DIAGNOSIS AND TESTING - RADIATOR
. . . . . . . . . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . . . . . . . . . . . 66
COOLANT
DESCRIPTION - ENGINE COOLANT
WARNING: ANTIFREEZE IS AN ETHYLENE GLYCOL BASE COOLANT AND IS HARMFUL IF SWALLOWED OR
INHALED. IF SWALLOWED, DRINK TWO GLASSES OF WATER AND INDUCE VOMITING. IF INHALED, MOVE
TO FRESH AIR AREA. SEEK MEDICAL ATTENTION IMMEDIATELY. DO NOT STORE IN OPEN OR UNMARKED
CONTAINERS. WASH SKIN AND CLOTHING THOROUGHLY AFTER COMING IN CONTACT WITH ETHYLENE
GLYCOL. KEEP OUT OF REACH OF CHILDREN. DISPOSE OF GLYCOL BASE COOLANT PROPERLY, CON-
TACT YOUR DEALER OR GOVERNMENT AGENCY FOR LOCATION OF COLLECTION CENTER IN YOUR
AREA. DO NOT OPEN A COOLING SYSTEM WHEN THE ENGINE IS AT OPERATING TEMPERATURE OR HOT
UNDER PRESSURE, PERSONAL INJURY CAN RESULT. AVOID RADIATOR COOLING FAN WHEN ENGINE
COMPARTMENT RELATED SERVICE IS PERFORMED, PERSONAL INJURY CAN RESULT.
CAUTION: Use of Propylene Glycol based coolants is not recommended, as they provide less freeze pro-
tection and less boiling protection.
The cooling system is designed around the coolant. The coolant must accept heat from engine metal, in the cylinder
head area near the exhaust valves and engine block. Then coolant carries the heat to the radiator where the tube/
fin radiator can transfer the heat to the air.
The use of aluminum cylinder blocks, cylinder heads, and water pumps requires special corrosion protection.
Mopar
T
Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769), or the equivalent ethylene glycol base coolant
with hybrid organic corrosion inhibitors (called HOAT, for Hybrid Organic Additive Technology) is recommended. This
coolant offers the best engine cooling without corrosion when mixed with 50% Ethylene Glycol and 50% distilled
water to obtain a freeze point of -37°C (-35°F). If it loses color or becomes contaminated, drain, flush, and replace
with fresh properly mixed coolant solution.
The green coolant MUST NOT BE MIXED with the orange or magenta coolants. When replacing coolant the com-
plete system flush must be performed before using the replacement coolant.
CAUTION: Mopar
T
Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any
other type of antifreeze. Doing so will reduce the corrosion protection and may result in premature water
pump seal failure. If non-HOAT coolant is introduced into the cooling system in an emergency, it should be
replaced with the specified coolant as soon as possible.
OPERATION
Coolant flows through the engine block absorbing the heat from the engine, then flows to the radiator where the
cooling fins in the radiator transfers the heat from the coolant to the atmosphere. During cold weather the ethylene-
glycol or propylene-glycol coolant prevents water present in the cooling system from freezing within temperatures
indicated by mixture ratio of coolant to water.
DIAGNOSIS AND TESTING - COOLANT CONCENTRATION TESTING
Coolant concentration should be checked when any additional coolant was added to system or after a coolant drain,
flush and refill. The coolant mixture offers optimum engine cooling and protection against corrosion when mixed to
a freeze point of -37°C (-34°F) to -46°C (-50°F). The use of a hydrometer or a refractometer can be used to test
coolant concentration.
A hydrometer will test the amount of glycol in a mixture by measuring the specific gravity of the mixture. The higher
the concentration of ethylene glycol, the larger the number of balls that will float, and higher the freeze protection
(up to a maximum of 60% by volume glycol).
A refractometer (Special Tool 8286) (Refer to 7 - COOLING - SPECIAL TOOLS) will test the amount of glycol in a
coolant mixture by measuring the amount a beam of light bends as it passes through the fluid.
WK
ENGINE
7 - 31
Some coolant manufactures use other types of glycols into their coolant formulations. Propylene glycol is the most
common new coolant. However, propylene glycol based coolants do not provide the same freezing protection and
corrosion protection and is not recommended.
CAUTION: Do not mix types of coolant—corrosion protection will be severely reduced.
STANDARD PROCEDURE - COOLANT SERVICE
For engine coolant recommended service schedule, (Refer to LUBRICATION & MAINTENANCE/MAINTENANCE
SCHEDULES - DESCRIPTION).
CONTAINER-COOLANT RECOVERY
DESCRIPTION
This system works along with the radiator pressure
cap. This is done by using thermal expansion and
contraction of the coolant to keep the coolant free of
trapped air. It provides:
•
A volume for coolant expansion and contraction.
•
A convenient and safe method for checking/ad-
justing coolant level at atmospheric pressure.
This is done without removing the radiator pres-
sure cap.
•
Some reserve coolant to the radiator to cover
minor leaks and evaporation or boiling losses.
As the engine cools, a vacuum is formed in the cool-
ing system of both the radiator and engine. Coolant
will then be drawn from the coolant tank and returned
to a proper level in the radiator.
The coolant reservoir/overflow system has a radiator
mounted pressurized cap, an overflow tube and a
plastic coolant reservoir/overflow tank mounted to the
right inner fender.
REMOVAL
1. Disconnect the coolant overflow hose (2).
2. Remove two mounting bolts (3).
3. Remove the coolant reservoir/overflow tank (1).
7 - 32
ENGINE
WK
INSTALLATION
1. Position the coolant reservoir/overflow tank (1) in
the vehicle.
2. Intstall two mounting bolts (3).
3. Install the coolant overflow hose (2).
FAN-RADIATOR
DESCRIPTION
3.7L ENGINE The radiator cooling fan used on the
3.7L engine is an electrical fan and is integral to the
fan shroud.
4.7L ENGINE The radiator cooling fan used on the
4.7L engine is a hybrid design. The hybrid fan system
consist of a low speed viscous driven mechanical fan
and a electrical fan.
WK
ENGINE
7 - 33
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст