Page 1985 of 2267
Water Pump
REMOVAL AND INSTALLATIONNCLC0018
CAUTION:
When removing water pump assembly, be careful not to
get coolant on drive belt.
Water pump cannot be disassembled and should be
replaced as a unit.
After installing water pump, and check for leaks using
radiator cap tester.
1. Drain coolant from radiator and cylinder block.
Refer to MA section (“Changing Engine Coolant”,“ENGINE
MAINTENANCE”).
2. Remove cylinder head front mounting bracket.
3. Remove drive belts and idler pulley.
4. Loosen water pump pulley bolts.
5. Remove water pump pulley.
6. Remove water pump bolts.
7. Remove water pump with gasket.
8. Reinstall parts in reverse order of removal.
SEM858F
17 - 24 (1.7 - 2.4, 12 - 17)
Water pump
6.3 - 8.3 (0.64 - 0.85, 55.6 - 73.8)
Do not re-use
:N·m (kg-m, in-lb)
:N·m (kg-m, ft-lb)Water pump pulley
17 - 24 (1.7 - 2.4, 12 - 17)
GasketSEC. 210
SEM869F Drain plug
SEM859F Water pump
ENGINE COOLING SYSTEMQG
Water Pump
LC-10
Page 1986 of 2267
INSPECTIONNCLC0019
Check body assembly and vane for rust or corrosion.
Check for rough operation due to excessive end play.
Thermostat
REMOVAL AND INSTALLATIONNCLC0021
Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant.
Use Genuine Liquid Gasket or equivalent.
1. Drain engine coolant.
2. Remove lower radiator hose.
3. Remove water inlet, then take out thermostat.
4. Install gum ring to thermostat.
SEM860F
SEM861F
17 - 24 (1.7 - 2.4, 12 - 17)
Thermostat housing
Bracket
6.0 - 7.7
(0.61 - 0.79,
52.9 - 68.6)
Water inlet
6.3 - 8.3
(0.64 - 0.85,
55.6 - 73.8) Thermostat
From lower radiator hoseGum ring
6.7 - 7.8
(0.68 - 0.80,
59.0 - 69.4)
Washer
17 - 24 (1.7 - 2.4, 12 - 17)
17 - 24 (1.7 - 2.4, 12 - 17) Do not re-use.
:N·m (kg-m, in-lb)
:N·m (kg-m, ft-lb) Engine frontTo upper radiator hoseWater outlet
Gasket
SEC. 210
SEM862F Gum ring
Thermostat flangeUpper
Jiggle valve
(top side)
ENGINE COOLING SYSTEMQG
Thermostat
LC-11
Page 1987 of 2267
5. Install thermostat with jiggle valve or air bleeder at upper side.
After installation, run engine for a few minutes, and check
for leaks.
INSPECTIONNCLC0022
1. Check for valve seating condition at normal room temperature.
It should seat tightly.
2. Check valve opening temperature and valve lift.
Valve opening temperature°C(°F) 82 (180)
Valve lift mm/°C (in/°F)More than 9/95 (0.35/203)
3. Then check if valve closes at 5°C (41°F) below valve opening
temperature.
SEM863F Jiggle valveJiggle valve position
Thermostat
housing
Thermostat
SLC343
ENGINE COOLING SYSTEMQG
Thermostat (Cont’d)
LC-12
Page 1988 of 2267
Radiator
COMPONENTS=NCLC0025
1Reservoir tank
2Reservoir hose
3Radiator cap
4Mounting bracket
5Upper radiator hose
6Mounting rubber
7Cooling fan motor
8Radiator
9Lower radiator hose
10Cooling fan
11Cooling fan motor shield
NLC086
:N·m (kg-m, in-lb)
3.8 - 4.5
(0.39 - 0.45,
34 - 39)
4.0 - 4.5
(0.41 - 0.45,
36 - 39)
3.25 - 4.25
(0.34 - 0.43,
29 - 37)
4.0 - 4.5
(0.41 - 0.45,
36 - 39)
ENGINE COOLING SYSTEMQG
Radiator
LC-13
Page 1989 of 2267
Cooling Fan Control SystemNCLC0026
Cooling fans are controlled by the ECM. For details, refer to EC
section [TROUBLE DIAGNOSIS FOR OVERHEAT (COOLING
SYSTEM)].
Refilling Engine CoolantNCLC0027
For details on refilling engine coolant, refer to MA section
(“ENGINE MAINTENANCE”,“Changing Engine Coolant”, MA-30)
ENGINE COOLING SYSTEMQG
Radiator (Cont’d)
LC-14
Page 1990 of 2267
Lubrication Circuit
SLC093B Return
Feed
Relief valve
Oil filter
Oil filter bracket
Oil cooler
Oil pump
Oil strainerCamshaft
Hydraulic lash adjuster
Oil pan
NLC043 Oil gallery
Oil passage
By-pass passage
To oil pan Regulator valve
(Built into oil pump)
Relief valve
Relief valve
(Built into oil filter) Oil pan
Oil strainer
Oil pump
Oil filter
Oil cooler
Chain tensioner
Timing chain Main gallery
Cylinder head oil
gallery
Hydraulic lash
adjuster Camshaft
journal Main bearing
Connecting rod bearing
Connecting rod
Piston and cylinder
ENGINE LUBRICATION SYSTEMSR20DE
Lubrication Circuit
LC-15
Page 1991 of 2267
Oil Pressure Check
WARNING:
Be careful not to burn yourself, as the engine and oil may
be hot.
Oil pressure check should be done in“Neutral position”.
1. Check oil level.
2. Remove oil pressure switch.
3. Install pressure gauge.
4. Start engine and warm it up to normal operating temperature.
5. Check oil pressure with engine running under no-load.
Engine speed
rpmApproximate discharge pressure
kPa (bar, kg/cm2, psi)
Idle speedMore than 78 (0.78, 0.8, 11)
3,200314 - 392 (3.14 - 3.92, 3.2 - 4.0, 46 - 57)
If difference is extreme, check oil passage and oil pump for oil
leaks.
6. Install oil pressure switch with sealant.
.Oil pressure
switch
.Oil cooler.NLC045
.SR20DE models
.SLC717A
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pressure Check
LC-16
Page 1992 of 2267
Oil Pump
REMOVAL AND INSTALLATION
1. Drain engine oil
2. Remove drive belts.
3. Remove cylinder head. (Refer to EM section).
4. Remove oil pan. (Refer to EM section).
5. Remove oil strainer and baffle plate.
6. Remove front cover assembly.
7. Install front cover assembly.
8. Reinstall any parts removed in reverse order of removal
DISASSEMBLY AND ASSEMBLY
1Oil pump cover
2Front cover
3Inner gear
4Outer gear
5Regulator valve
6Spring
7Plug
8Regulator valve set
9Oil strainer
Always replace oil seal, gasket and O-ring with new ones.
When installing oil pump, apply engine oil to inner and
outer gears.
Be sure that O-rings are properly fitted.
NLC050
Gasket
3.7 - 5.0 (0.38 - 0.51, 32.7 - 44.3)
6.3 - 8.3 (0.64 - 0.85, 55.8 - 73.5)
16 - 19 (1.6 - 1.9, 12 - 14)
50 - 70 (5.1 - 7.1, 37 - 51) :N·m (kg-m, ft-lb)
:N·m (kg-m, in-lb)
: Apply engine oil.
: Apply liquid gasket.
SEC. 135⋅150
.
ENGINE LUBRICATION SYSTEMSR20DE
Oil Pump
LC-17