
SPECIAL SERVICE TOOL........................................31
Cooling Circuit ...........................................................32
System Check............................................................32
CHECKING COOLING SYSTEM HOSES...................32
CHECKING COOLING SYSTEM FOR LEAKS............32
CHECKING RADIATOR............................................33
CHECKING RADIATOR CAP....................................33
Water Pump ...............................................................33
REMOVAL AND INSTALLATION...............................33
INSPECTION...........................................................34
Thermostat .................................................................35
REMOVAL AND INSTALLATION...............................35
INSPECTION...........................................................36
Water Outlet ...............................................................36
INSPECTION...........................................................36
INSTALLATION........................................................36
Radiator .....................................................................37
COMPONENTS.......................................................37
Cooling Fan Control System .....................................37
Changing Engine Coolant..........................................38
- DRAINING ENGINE COOLANT -............................38
- REFILLING ENGINE COOLANT -...........................38
- FLUSHING COOLING SYSTEM -............................39
Overheating Cause Analysis .....................................40
Service Data and Specifications (SDS).....................41
THERMOSTAT........................................................41
RADIATOR..............................................................41
COOLANT CAPACITY..............................................41
YD
ENGINE LUBRICATION SYSTEM................................42
Precautions ................................................................42
LIQUID GASKET APPLICATION PROCEDURE..........42
Preparation ................................................................42
SPECIAL SERVICE TOOLS......................................42
Lubrication Circuit ......................................................43
Oil Pressure Check....................................................44
Oil Pump ....................................................................44
REMOVAL AND INSTALLATION...............................44
DISASSEMBLY AND ASSEMBLY..............................45
OIL PUMP INSPECTION..........................................45
REGULATOR VALVE INSPECTION..........................46
Changing Engine Oil..................................................47
Oil Filter Bracket ........................................................48
REMOVAL AND INSTALLATION...............................48
Changing Oil Filter .....................................................48
REMOVAL...............................................................49
INSTALLATION........................................................49
Oil Cooler ...................................................................50
REMOVAL AND INSTALLATION...............................50
Service Data and Specifications (SDS).....................51
OIL PRESSURE CHECK..........................................51
REGULATOR VALVE INSPECTION..........................51
OIL PUMP INSPECTION..........................................51
ENGINE OIL CAPACITY...........................................51
ENGINE COOLING SYSTEM........................................52
Precautions ................................................................52
LIQUID GASKET APPLICATION PROCEDURE..........52
Preparation ................................................................52
SPECIAL SERVICE TOOLS......................................52
Cooling Circuit ...........................................................53
System Check............................................................54
CHECKING COOLING SYSTEM HOSES...................54
CHECKING RADIATOR............................................54
CHECKING RADIATOR CAP....................................54
CHECKING COOLING SYSTEM FOR LEAKS............55
Water Pump ...............................................................55
REMOVAL AND INSTALLATION...............................55
REMOVAL...............................................................56
INSPECTION...........................................................56
INSTALLATION........................................................56
Thermostat .................................................................57
REMOVAL AND INSTALLATION...............................57
INSPECTION...........................................................58
Radiator .....................................................................58
COMPONENTS.......................................................58
REMOVAL AND INSTALLATION...............................59
Cooling Fan ...............................................................59
COMPONENTS.......................................................59
CONTROL SYSTEM................................................59
Changing Engine Coolant..........................................59
- DRAINING ENGINE COOLANT -............................59
- REFILLING ENGINE COOLANT -...........................60
- FLUSHING COOLING SYSTEM -............................61
Overheating Cause Analysis .....................................62
Service Data and Specifications (SDS).....................63
THERMOSTAT........................................................63
RADIATOR..............................................................63
ENGINE COOLANT CAPACITY................................63
CONTENTS(Cont'd)
LC-2

7. Repeat steps 1 through 6 until clear water begins to drain from
radiator.
Overheating Cause AnalysisNLLC0028
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
Ð Thermostat stuck closed Ð
Damaged finsDust contamination or
paper clogging
Mechanical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
ÐÐ High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud Ð Ð Ð
Improper coolant mixture
ratioÐÐÐ
Poor coolant quality Ð Ð Ð
Insufficient coolantCoolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration
ENGINE COOLING SYSTEMQG
Overheating Cause Analysis
LC-21

Symptom Check items
Except cool-
ing system
parts mal-
functionÐ Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
Ð Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper Ð
Ð Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator Ð
Blocked condenser
Ð
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTATNLLC0029
Valve opening temperature ÉC (ÉF) 82 (180)
Valve lift mm/ÉC (in/ÉF)More than 8/95 (0.31/203)
RADIATORNLLC0030Unit: kPa (bar, kg/cm2, psi)
Cap reliefpressureStandard 78 - 98 (0.78 - 0.98, 0.8 - 1.0, 11 - 14)
Limit 59 - 98 (0.59 - 0.98, 0.6 - 1.0,9-14)
Leakage test pressure157 (1.57, 1.6, 23)
COOLANT CAPACITYNLLC0038Unit:!(Imp qt)
With reservoir tank6.75 (6)
Reservoir tank0.7 (5/8)
ENGINE COOLING SYSTEMQG
Overheating Cause Analysis (Cont'd)
LC-22

Overheating Cause AnalysisNLLC0109
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
Ð Thermostat stuck closed Ð
Damaged finsDust contamination or
paper clogging
Mechanical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
ÐÐ High resistance to fan
rotation
Damaged fan blades
Damaged radiator shroud Ð Ð Ð
Improper coolant mixture
ratioÐÐ Ð
Poor coolant quality Ð Ð Ð
Insufficient coolantCoolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deterioration
Cylinder head gasket dete-
rioration
ENGINE COOLING SYSTEMSR
Overheating Cause Analysis
LC-40

Symptom Check items
Except cool-
ing system
parts mal-
functionÐ Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
Ð Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper Ð
Ð Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator Ð
Blocked condenser
Ð
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTATNLLC0110
Valve opening temperature ÉC (ÉF) 82 (180)
Valve lift mm/ÉC (in/ÉF)More than 8/95 (0.31/203)
RADIATORNLLC0111Unit: kPa (bar, kg/cm2, psi)
Cap reliefpressureStandard 78 - 98 (0.78 - 0.98, 0.8 - 1.0, 11 - 14)
Limit 59 - 98 (0.59 - 0.98, 0.6 - 1.0,9-14)
Leakage test pressure157 (1.57, 1.6, 23)
COOLANT CAPACITYNLLC0112Unit:!(Imp qt)
With reservoir tank6.75 (6)
Reservoir tank0.7 (5/8)
ENGINE COOLING SYSTEMSR
Overheating Cause Analysis (Cont'd)
LC-41

Overheating Cause AnalysisNLLC0070
Symptom Check items
Cooling sys-
tem parts
malfunctionPoor heat transferWater pump malfunction Worn or loose drive belt
Ð Thermostat stuck closed Ð
Damaged finsDust contamination or
paper clogging
Mechanical damage
Clogged radiator cooling
tubeExcess foreign material
(rust, dirt, sand, etc.)
Reduced air flowCooling fan does not oper-
ate
ÐÐ High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud Ð Ð Ð
Improper coolant mixture
ratioÐÐÐ
Poor coolant quality Ð Ð Ð
Insufficient coolantCoolant leaksCooling hoseLoose clamp
Cracked hose
Water pump Poor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, dete-
rioration or improper fit-
ting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into
cooling systemCylinder head deteriora-
tion
Cylinder head gasket
deterioration
ENGINE COOLING SYSTEMYD
Overheating Cause Analysis
LC-62

Symptom Check items
Except cool-
ing system
parts mal-
functionÐ Overload on engineAbusive drivingHigh engine rpm under
no load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
Ð Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper Ð
Ð Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator Ð
Blocked condenser
Ð
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTATNLLC0071
Valve opening temperature Above 80 - 84ÉC (176 - 183ÉF)
Valve liftMore than 10 mm/95ÉC (0.394 in/203ÉF)
RADIATORNLLC0073Unit: kPa (bar, kg/cm2, psi)
Cap relief pressureStandard 78 - 98 (0.78 - 0.98, 0.8 - 1.0, 11 - 14)
Limit 59 - 98 (0.59 - 0.98, 0.6 - 1.0,9-14)
Leakage test pressure157 (1.57, 1.6, 23)
ENGINE COOLANT CAPACITYNLLC0080Unit:!(Imp qt)
With reservoir tank7.05 (6-1/4)
Reservoir tank0.7 (5/8)
ENGINE COOLING SYSTEMYD
Overheating Cause Analysis (Cont'd)
LC-63