Page 516 of 1463
M161 ENGINE COOLING 1D2-11
THERMOSTAT
Removal & Installation Procedure
1. Drain the coolant from the radiator.
2. Loosen the hose mounting clip and remove the coolant hose
(3, 4).
3. Unscrew the three bolts (1) and remove the thermostat cover
assembly from thermostat housing.
Installation Notice
Do not separate the thermostat cover and thermostat.
4. Replace the O-ring if necessary.
5. Check the leakage in the cooling system.
Tightening Torque 9 - 11 Nm 1 Bolt (M6 X 25, 3 pieces)........................ 9 -11 Nm
2 Thermostat Cover
3 De-aeration Hose4 Coolant Outlet Hose
5 Thermostat
6 O-ring
Page 517 of 1463
1D2-12 M161 ENGINE COOLING
THERMOSTAT HOUSING ASSEMBLY
Preceding Work : Removal of viscous clutch
1a Bolt (M6 X 95, 2 pieces)......................... 9-11 Nm
1b Bolt (M8 X 75, 2 pieces).................22.5-27.5 Nm
1c Bolt (M8 X 35, 1 piece)...................22.5-27.5 Nm
2 Thermostat Housing Assembly
3 O-ring4 De-aeration Hose
5 Coolant Outlet Hose
6 Coolant Bypass Hose
7 Tensioning Device Shock Absorber
8 Engine Hanger Brocket
Page 518 of 1463
M161 ENGINE COOLING 1D2-13
Removal & Installation Procedure
1. Drain the coolant.
2. Remove the de-aeration hose (4), coolant outlet hose (5)
and coolant bypass hose (6).
3. Disconnect the coolant temperature sensor connector.
4. Unscrew the bolt (1c) and pry off the tensioning device shock
absorber (7).
Installation Notice
6. Replace the O-ring with new one.
7. Installation should follow the removal procedure in the
reverse order.
8. Check for leaks in cooling system. 5. Unscrow the bolts (1a, 1b) and remove the engine
hanger bracket and thermostat housing.
Installation Notice
Tightening Torque9 - 11 Nm
22.5 - 27.5 Nm
(1a)
(1b)
Tightening Torque 22.5 - 27.5 Nm
Page 520 of 1463
M161 ENGINE COOLING 1D2-15
REMOVAL AND INSTALLATION OF RADIATOR
Preceding Work : Removal of cooling fan shroud
1 Inlet Hose
2 Hose (to Engine)
3 Hose (to 3-way Connector)
4 Make-up Hose (to Coolant Reservoir)
5 3-way Connector
6 Automatic Transmission Oil Cooling Hose (A/T
Equippend Vehicle)7 Bolt (M6 X 20, 4 pieces)...........................3-7 Nm
8 Insulator
9 Radiator Bracket
10 Radiator
Page 521 of 1463
1D2-16 M161 ENGINE COOLING
Removal & Installation Procedure
1. Drain coolant from the radiator.
2. Remove the coolant thermo connector from the radiator.
3. Remove the each coolant hoses.
Tightening Torque 14 Nm
4. Remove the automatic transmission oil cooling hose.
Installation Notice
5. Unscrew the bolts from radiator bracket and remove the
bracket and insulator.
Installation Notice
Tightening Torque 3 - 7 Nm
6. Remove the radiator upper mounting bolts and then
remove the bracket and insulator.
7. Remove the radiator.
8. Check the radiator pin for crack, damage, leakage and
bending and replace if necessary.
9. Installation should follow the removal procedure in the
reverse order.
10. Berform the cooling system leakage test.
Page 522 of 1463

SECTION 1D3
OM600 ENGINE COOLING
Specifications . . . . . . . . . . . . . . . . . . . . . . . 1D3-1
General Specifications . . . . . . . . . . . . . . . . . 1D3-1
Fastener Tightening Specifications . . . . . . . . 1D3-1
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . 1D3-2
Cooling Circulation . . . . . . . . . . . . . . . . . . . . 1D3-2
Thermostat Operation . . . . . . . . . . . . . . . . . 1D3-3
Cooling System Leakage Test . . . . . . . . . . . 1D3-4
Maintenance and Repair . . . . . . . . . . . . . . 1D3-5On-Vehicle Service . . . . . . . . . . . . . . . . . . . . 1D3-5
Drain and Filling of Coolant . . . . . . . . . . . . . 1D3-5
Coolant Pump . . . . . . . . . . . . . . . . . . . . . . . . 1D3-6
Coolant Pump Housing . . . . . . . . . . . . . . . . . 1D3-8
Cooling Fan Clutch . . . . . . . . . . . . . . . . . . . 1D3-10
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . 1D3-12
Cooling Sub-System . . . . . . . . . . . . . . . . . . 1D3-14
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . 1D3-16
TABLE OF CONTENTS
Caution: Disconnect the negative battery cable before removing or installing any electrical unit or when a
tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable
will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise
noted.
Application
Coolant
Mixing Ratio (Water : anticorrosion)
CapacityDescription
ALUTEC P- 78
50 : 50
10.5L - 11L
9.5L - 10L
SPECIFICATIONS
GENERAL SPECIFICATIONS
Application
Coolant Pump Bolt
Belt Pulley Bolt
Coolant Pump Housing Return Pipe Bolt
Thermostat Bolt
Cooling Fan Clutch Socket Bolt (Center)
Cooling Fan Clutch Socket Bolt (Side)
Radiator Bolt
Coolant Sub-tank BoltN
· ·· ·
·m
10
10
10
10
45
10
3 - 7
3 - 7
FASTENER TIGHTENING SPECIFICATIONS
662LA
661LA
Page 524 of 1463
OM600 ENGINE COOLING 1D3-3
THERMOSTAT OPERATION
Operation
1. At warming up
Valve closes until temperature of coolant reaches to 85°C.
B. From Radiator
C. From Crankcase
D. To Crankcase
2. At partial opening.
Valve opens partially as temperature of coolant is maintained
between 85-100°C.
3. At full opening.
Valve opens full as temperature of coolant is more then
100°C.
Page 525 of 1463
1D3-4 OM600 ENGINE COOLING
COOLING SYSTEM LEAKAGE TEST
Tools Required
124 589 15 21 00 Tester
Test
1. Loosen the pressure cap by 1 notch and remove the cap
after.
Notice
Do not remove radiator cap when coolant is above 90°C.
2. Add the coolant to the arrow mark of coolant reservoir.
3. Connect the special tool to the injector of reservoir and apply
1.4bar pressure.
Tester 124 589 15 21 00
4. If the pressure on the tester drops, check the hose, pipe
and leakage and, replace or retighten.