Dodge Viper SRT-10 (ZB). Manual — part 49
REMOVAL
(1) Remove the air cleaner housing (Refer to 9 -
ENGINE/AIR
INTAKE
SYSTEM/AIR
CLEANER
HOUSING - REMOVAL).
(2) Release the belt tension by rotating the ten-
sioner counterclockwise with a 15 mm wrench on
the tensioner pulley bolt. Rotate belt tensioner until
belt can be removed from pulleys (Fig. 1).
(3) Remove belt.
(4) Gently release tensioner.
(5) If belt tensioner removal is necessary, remove
tensioner mounting nut (Fig. 2).
INSPECTION
Satisfactory performance of the belt driven accesso-
ries depends on belt condition and proper belt ten-
sion.
Belt replacement under any or all of the following
conditions is required:
• Excessive wear.
• Frayed cords.
• Severe glazing.
The Poly-V belt with a back driven pulley may
develop minor cracks across the ribbed side (due to
reverse bending). These minor cracks are considered
normal and acceptable. Parallel cracks are not (Fig.
3).
Fig. 1 Accessory Drive Belt Routing
1 - GENERATOR
2 - IDLER PULLEY
3 - POWER STEERING PUMP
4 - A/C COMPRESSOR
5 - CRANKSHAFT
6 - BELT TENSIONER
7 - WATER PUMP
Fig. 2 Accessory Drive Belt Tensioner Mounting Nut
1 - MOUNTING NUT
Fig. 3 Drive Belt Inspection
1 - NORMAL CRACKS BELT OK
2 - NOT NORMAL CRACKS REPLACE BELT
7 - 4
ACCESSORY DRIVE
ZB
ACCESSORY DRIVE BELT AND TENSIONER (Continued)
INSTALLATION
NOTE: When installing accessory drive belt onto
pulleys, make sure that belt is properly routed and
all V-grooves make proper contact with pulleys.
(1) If belt tensioner was removed, install tensioner
and mounting nut (Fig. 2). Torque mounting nut to
41 N·m (30 ft. lbs.).
(2) Position the drive belt over all pulleys except
for the water pump pulley (Fig. 1).
(3) Rotate tensioner counterclockwise and slip
the belt over the water pump pulley.
(4) Gently release tensioner.
(5) Install the air cleaner housing (Refer to 9 -
ENGINE/AIR
INTAKE
SYSTEM/AIR
CLEANER
HOUSING - INSTALLATION).
ZB
ACCESSORY DRIVE
7 - 5
ACCESSORY DRIVE BELT AND TENSIONER (Continued)
ENGINE
TABLE OF CONTENTS
page
page
ENGINE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
COOLANT
DIAGNOSIS AND TESTING - COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PRESSURE CAP
. . . . . . . . . . . . . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DIAGNOSIS AND TESTING - COOLING
. . . . . . . . . . . . . . . . . . . . . . . . . . 16
COOLANT PRESSURE BOTTLE
. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . 17
ENGINE COOLANT TEMPERATURE SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . 18
ENGINE COOLANT THERMOSTAT
. . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DIAGNOSIS AND TESTING - THERMOSTAT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . 19
HOSE CLAMPS
. . . . . . . . . . . . . . . . . . . . . . . . . 20
COOLING SYSTEM HOSES
. . . . . . . . . . . . . . . . . . . . . . . . . 20
RADIATOR FAN
. . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . 23
RADIATOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . 25
WATER PUMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . 26
ENGINE
OPERATION
The cooling systems maintains engine temperature
in a range that will provide satisfactory engine per-
formance and emission levels under all expected driv-
ing conditions.
It also provides a source of hot water (coolant) for
heater performance. It performs this task by trans-
ferring heat from engine block to the coolant, then
moving this heated coolant to the radiator where the
heat is transferred to the ambient air.
• When engine is cold the thermostat is closed.
The cooling system has no flow through the radiator.
The coolant flows through the engine, water pump,
and heater.
• When engine is warm the thermostat is full
open. The coolant flows through the radiator, heater,
and water pump.
DIAGNOSIS AND TESTING
COOLING SYSTEM
Establish what driving condition caused the cooling
system complaint. The problem may be caused by an
abnormal load on the system such as the following:
prolonged idle, very high ambient temperature, slight
tail wind at idle, slow traffic speed, traffic jam, high
speed, steep grade.
VISUAL INSPECTION
If the cooling system problem is not caused by a
driving condition, perform a visual inspection to
determine if there was a recent service or accident
repair, including the following:
• Loose/damaged accessory drive belt
• Incorrect cooling system refilling (trapped air or
low level)
• Brakes possibly dragging
7 - 6
ENGINE
ZB
• Damaged hoses
• Loose/damaged hose clamps
• Damaged/incorrect engine thermostat
• Damaged radiator hydraulic fan motor, fan blade
and fan shroud
• Damaged head gasket
• Damaged water pump
• Damaged radiator
• Damaged coolant recovery system
• Damaged heater core
If the visual inspection reveals none of the above
as cause for a cooling system complaint, refer to the
following diagnostic charts.
COOLING SYSTEM DIAGNOSIS CHART
CONDITION
POSSIBLE CAUSES
CORRECTION
PRESSURE CAP IS BLOWING
OFF STEAM AND/OR COOLANT.
TEMPERATURE GAUGE READ-
ING MAY BE ABOVE NORMAL
BUT NOT HIGH.
1. Pressure relief valve in pressure
cap is defective, or was not prop-
erly seated.
1. Check condition of pressure cap
and cap seal. Replace cap as nec-
essary.
2. Incorrect pressure cap was
installed.
2. Replace pressure cap as neces-
sary.
3. Incorrect coolant mixture.
3. Make sure a 50% by volume
mixture of coolant is used.
COOLANT LOSS TO THE
GROUND WITHOUT PRESSURE
CAP BLOWOFF. GAUGE IS
READING HIGH OR HOT.
1. Coolant leaks in radiator, cool-
ing system hoses, water pump or
engine.
1. Pressure test cooling system
and repair as necessary.
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION SYS-
TEM). GAUGE MAY NOT BE
READING HIGH.
1. Engine overheating.
1. Check reason for overheating
and repair as necessary.
2. Freeze point of coolant not cor-
rect. Mixture too concentrated or
too diluted.
2. Check freeze point of the cool-
ant. Adjust the ethylene glycol-to-
water ratio as required.
3. Wrong cooling system pressure
cap.
3. Install correct pressure cap.
HOSE(S) COLLAPSE AS ENGINE
COOLS DOWN.
1. Vacuum created in cooling sys-
tem on engine cool-down is not
being relieved through coolant bot-
tle system.
1. Pressure cap relief valve stuck.
Replace as necessary.
INADEQUATE AIR CONDITIONER
PERFORMANCE (COOLING SYS-
TEM SUSPECTED).
1. Radiator and/or A/C condenser
is restricted, obstructed, or dirty
(insects, leaves, etc.).
1. Remove restriction and/or clean
as necessary.
2. Engine is overheating (heat may
be transferred from radiator to A/C
condenser). High underhood tem-
peratures due to engine overheat-
ing may also transfer heat to A/C
components.
2. Correct overheating condition.
ZB
ENGINE
7 - 7
ENGINE (Continued)
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