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ENGINE LUBRICATION &
COOLING SYSTEMS
SECTION
CONTENTS
PRECAUTION..................................................................2
PREPARATION................................................................3
Special Service Tools ..................................................3
QG
ENGINE LUBRICATION SYSTEM..................................4
Lubrication Circuit ........................................................4
Oil Pressure Check......................................................5
Oil Pump ......................................................................5
Oil Filter .......................................................................7
ENGINE COOLING SYSTEM..........................................8
Cooling Circuit .............................................................8
System Check..............................................................8
Water Pump ...............................................................10
Thermostat.................................................................11
Radiator .....................................................................13
SR20DE
ENGINE LUBRICATION SYSTEM................................15
Lubrication Circuit ......................................................15
Oil Pressure Check....................................................16
Oil Pump ....................................................................17
Oil Filter .....................................................................19
Oil Cooler...................................................................20
ENGINE COOLING SYSTEM........................................21
Cooling Circuit ...........................................................21
System Check............................................................21
Cooling System Inspection ........................................21
Water Pump ...............................................................22
Thermostat.................................................................23
Radiator .....................................................................25
CD20T
ENGINE LUBRICATION SYSTEM
................................26
Lubrication Circuit ......................................................26
Oil Pressure Check....................................................27
Oil Pump ....................................................................27
Oil Cooler...................................................................30
ENGINE COOLING SYSTEM........................................31
Cooling Circuit ...........................................................31
System Check............................................................32
Water Pump ...............................................................33
Thermostat.................................................................34
Radiator .....................................................................36
LC
LC
Overheating Cause Analysis .....................................37
QG
SERVICE DATA AND SPECIFICATIONS (SDS)
..........39
Oil Pressure Check....................................................39
Oil Pump Inspection ..................................................39
Regulator Valve Inspection........................................39
Thermostat.................................................................39
Radiator .....................................................................39
SR20DE
Oil Pressure Check....................................................40
Oil Pump Inspection ..................................................40
Regulator Valve Inspection........................................40
Thermostat.................................................................40
Radiator .....................................................................40
CD20T
Oil Pressure Check....................................................41
Oil Pump Inspection ..................................................41
Thermostat.................................................................41
Radiator .....................................................................41
PRECAUTION
LIQUID GASKET APPLICATION PROCEDURE
1.
Use a scraper to remove all traces of old liquid gasket from
mating surfaces and grooves. Also, completely clean any oil
from these areas.
Apply a continuous bead of liquid gasket to mating surfaces.
(Use Genuine Liquid Gasket or equivalent.)
Be sure liquid gasket is 4.0 to 5.0 mm (0.157 to 0.197 in) wide
for SR engine and 3.5 to 4.5 mm (0.138 to 0.177 in) wide for
QG and CD engine (for oil pan).
Be sure liquid gasket is 2.0 to 3.0 mm (0.079 to 0.118 in) wide
(in areas except oil pan).
Apply liquid gasket around the inner side of bolt holes (unless
otherwise specified).
Assembly should be done within 5 minutes after coating.
Wait at least 30 minutes before refilling engine oil and engine
coolant.
Inner
side
2.
¼
Groove
Bolt hole
SEM164
¼
3.
4.
5.
Inner side
Groove
.
AEM080
LC-2
PREPARATION
Special Service Tools
Special Service Tools
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
Tool name
ST25051001*
Oil pressure gauge
PS1/4x19/in
Description
SR
Measuring oil
pressure
Maximum measuring
range: 2,452 kPa
(24.5 bar, 25 kg/cm
2
,
356 psi)
PS1/8x28/in
PS1/4x19/in
Adapting oil
pressure gauge to
cylinder block
X
X
X
X
X
X
Engine
application
CD
QG
NT558
ST25052000*
Hose
NT559
KV10115801 or
KV10115800
Oil filter wrench
Removing oil filter
15 faces,
Inner span: 64.3 mm (2.531 in)
(Face to opposite face)
X
—
X
NT362
99545R2500
(KV10106S0)
Oil filter wrench
Removing oil filter
15 faces,
Inner span: 92.5 mm (3.642 in)
(Face to opposite corner)
NT631
—
X
—
WS39930000
Tube presser
Pressing the tube of
liquid gasket
X
X
X
NT052
EG17650301
Radiator cap tester
adapter
Adapting radiator
cap tester to radiator
filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
X
X
X
NT564
*:Special tool or commercial equivalent
LC-3
ENGINE LUBRICATION SYSTEM
Lubrication Circuit
QG
Lubrication Circuit
Oil drop
NCLC0003
Intake camshaft
Exhaust camshaft
VTC
Main gallery
Timing chain guide
Chain tensioner
Oil jet
Relief valve
Oil filter
Oil pump
Oil strainer
SEM852F
Oil passage
Oil pan
Oil strainer
Oil gallery in cylinder block
By-pass passage
Oil pump
Regulator valve
Oil jet
Drain
Oil filter
Oil pressure
relief valve
Main oil
gallery
Cylinder head
oil gallery
Main bearing
Timing chain
oil jet
#1 Intake
camshaft journal
#1 Exhaust
camshaft journal
Exhaust
camshaft journal
Intake
camshaft journal
Chain tensioner
Connecting rod
bearing
Timing chain
Valve timing
control solenoid
(OFF)
(ON)
#1 Intake
camshaft
#1 Exhaust
camshaft
Exhaust
camshaft
Intake
camshaft
Connecting rod
Valve timing
controller
Valve lifter
Valve lifter
Piston
SEM938F
LC-4
ENGINE LUBRICATION SYSTEM
Oil pressure switch
QG
Oil Pressure Check
Oil Pressure Check
NCLC0004
Front
WARNING:
¼
Be careful not to burn yourself, as the engine and oil may
be hot.
¼
Put gearshift lever in Neutral “N” position.
1. Check oil level.
2. Remove oil pressure switch.
SEM853F
3.
4.
5.
ST25051001
Install pressure gauge.
Start engine and warm it up to normal operating temperature.
Check oil pressure with engine running under no-load.
Engine speed
rpm
600
2,000
Approximate discharge pressure
kPa (bar, kg/cm
2
, psi)
More than 98 (0.98, 1.0, 14)
More than 294 (2.94, 3.0, 43)
More than 392 (3.92, 4.0, 57)
ST25052000
SLC926-A
6,000
¼
6.
If difference is extreme, check oil passage and oil pump
for oil leaks.
Install oil pressure switch with sealant.
Oil Pump
REMOVAL AND INSTALLATION
¼
¼
¼
1.
2.
3.
4.
5.
6.
7.
NCLC0005
Always replace oil seal with a new one. Refer to EM sec-
tion (“OIL SEAL REPLACEMENT”).
When installing oil pump, apply engine oil to gears.
Make sure that O-ring is fitted properly.
Drain engine oil.
Remove drive belts.
Remove oil pan. Refer to EM section (“OIL PAN”).
Remove oil strainer.
Remove front cover. Refer to EM section (“TIMING CHAIN”).
Install front cover.
Reinstall parts in reverse order of removal.
LC-5

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