Page 287 of 1463
1B2-98 M161 ENGINE MECHANICAL
Oil Circulation
1 Oil Strainer
2 Oil Pump
3 Oil Pan
4 Oil Non-Return Valve
5 Oil Filter
6 Oil Filter Bypass Valve
7 Main Oil Gallery
8 Closing Ball (
f 15mm)
9 Crankshaft
10 Connecting Rod Bearing
11 Crankshaft Bearing
12 Connecting Rod
13 Piston
14 Oil Spray (Piston Crown Area)
15 Non-Return Valve (Crankcase)16 Oil Supply (To Chain Tensioner)
1 7 Camshaft
18 Cam Bearing
19 Valve
20 Oil Gallery (Supply Oil to Intake Tappet)
21 Oil Gallery (Supply Oil to Exhaust Tappet)
22 Ball (
f 8mm)
23 Camshaft Plug
2 4 Seal
25 Screw Plug
26 Oil Return Gallery (Cylinder Head and
Crankcase)
27 Oil Return Gallery (Crankcase)
28 End Cover (
f 20mm)
29 Oil Return Pipe
Page 288 of 1463
M161 ENGINE MECHANICAL 1B2-99
ENGINE OIL AND OIL FILTER ELEMENT
1 Oil Filter Cover.......................................... 25 Nm
2 O-ring .................................................... Replace
3 Oil Filter Element4 Oil Drain Plug
5 Oil Filter Bypass Valve
6 Oil Filter Cap
Page 289 of 1463

1B2-100 M161 ENGINE MECHANICAL
9. Fill up engine oil through the engine oil filler opening.
10. Check for oil leaks at normal engine temperature after
starting the engine.
11. Stop the engine and wait 5 minutes.
Check the oil level and fill up as specified if necessary. 4. Remove the drain plug (1) and drain the engine oil.
Notice
Leave the oil filler cap (3) open to ease the engine oil
discharge.
5. Tighten the engine oil drain plug after cleaning it.
Installation Notice Tools Required
103 589 02 09 00 Oil Filter Socket Wrench
Replacement Procedure
1. Install the socket wrench”7” (special tool : 103 589 02 09
00) on the oil filter cover (2).
Notice
Make the screw cover removable by tightening the bolt at
the side of the socket wrench (special tool).
2. Install the wrench to the upper bolt in the socket wrench
and remove the oil cover by turning it.
3. Remove the oil filter element.
Notice
Work with a cloth under the vehicle when removing the oil
filter element to not drain the oil.
Replace the seal washer with new one.
6. Replace the O-ring(5) in the oil filter cover with new one.
Notice
Apply the engine oil to the O-ring.
7. Insert new oil filter element into the oil filter housing.
Tightening Torque 25 Nm
8. Temporarily tighten the oil filter cover (2). Install the socket
wrench “7” (special tool : 103 589 02 09 00), and then
completely tighten it.
Installation Notice
2 Oil Filter Cover
5 O-ring
6 Oil Filter Element
7 Special Tool (Socket Wrench)
Tightening Torque 25 Nm
Page 303 of 1463

SECTION 1B3
OM600 ENGINE MECHANICAL
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.
Specifications . . . . . . . . . . . . . . . . . . . . . . . 1B3-2
Fastener Tightening Specifications . . . . . . . . 1B3-2
Special Tools . . . . . . . . . . . . . . . . . . . . . . . 1B3-4
Special Tools Table . . . . . . . . . . . . . . . . . . . . 1B3-4
Maintenance and Repair . . . . . . . . . . . . . 1B3-12
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . 1B3-12
Engine Assembly . . . . . . . . . . . . . . . . . . . . 1B3-12
Poly V-Belt . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-21
Tensioning Device . . . . . . . . . . . . . . . . . . . . 1B3-23
Poly V-Belt Alignment & Inspection . . . . . . . 1B3-26
Prechamber . . . . . . . . . . . . . . . . . . . . . . . . 1B3-29
Milling of Prechamber Sealing Surface . . . . 1B3-32
TDC (TDC Sensor Bracket) Setting . . . . . . 1B3-35
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . 1B3-37
Timing Case Cover . . . . . . . . . . . . . . . . . . . 1B3-63
Crankshaft End Cover . . . . . . . . . . . . . . . . 1B3-71
Vibration Damper and Hub . . . . . . . . . . . . . 1B3-74
Crankshaft Front Radial Seal . . . . . . . . . . . 1B3-80
Crankshaft Ball Bearing . . . . . . . . . . . . . . . 1B3-82
Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-83
Flywheel . . . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-93
Machining of Flywheel . . . . . . . . . . . . . . . . 1B3-97
Flywheel Ring Gear . . . . . . . . . . . . . . . . . . 1B3-98
Hydraulic Valve Clearance Compensation
Element Check . . . . . . . . . . . . . . . . . . . . 1B3-101
Valve Tappets . . . . . . . . . . . . . . . . . . . . . . 1B3-103
Valve Spring Check . . . . . . . . . . . . . . . . . 1B3-105
Valve Springs (Cylinder Head Removed) . 1B3-106
TABLE OF CONTENTS
Valve Springs (Cylinder Head Installed) . . 1B3-109
Valve Stem Seals . . . . . . . . . . . . . . . . . . . 1B3-112
Check and Replacement of
Valve Guides . . . . . . . . . . . . . . . . . . . . . 1B3-116
Valve Seat Rings . . . . . . . . . . . . . . . . . . . 1B3-122
Check and Machining of Valves . . . . . . . . 1B3-127
Machining of Valve Seat . . . . . . . . . . . . . . 1B3-132
Camshaft Timing Test . . . . . . . . . . . . . . . . 1B3-137
Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-139
Chain Tensioner . . . . . . . . . . . . . . . . . . . . 1B3-145
Timing Chain . . . . . . . . . . . . . . . . . . . . . . . 1B3-147
Tensioning Rail . . . . . . . . . . . . . . . . . . . . . 1B3-151
Cylinder Head Guide Rail . . . . . . . . . . . . . 1B3-152
Timing Case Cover Guide Rail . . . . . . . . . 1B3-156
Crankshaft Sprocket . . . . . . . . . . . . . . . . . 1B3-158
Piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-163
Oil Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-169
Oil Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-171
Oil Spray Nozzle . . . . . . . . . . . . . . . . . . . . 1B3-174
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . 1B3-175
Unit Repair . . . . . . . . . . . . . . . . . . . . . . . 1B3-177
Cylinder Head Pressure Leakage Test . . . 1B3-177
Facing Cylinder Head Mating Surface . . . . 1B3-178
Replacement of Crankcase Core Plug . . . 1B3-180
Facing Crankcase Contacting Surface . . . 1B3-182
Oil Gallery Steel Ball . . . . . . . . . . . . . . . . . 1B3-183
Cylinder Bore Measurement . . . . . . . . . . . 1B3-187
Page 304 of 1463
1B3-2 OM600 ENGINE MECHANICAL
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
N
· ·· ·
·m
28 - 47
30
3 - 7
8 - 18
20 - 34
30
70 - 80
81 - 84
50 - 75
N
· ·· ·
·m
10
23
200 / 90°
10
55 / 90°
45 / 90°
25 / 90°
25
N
· ·· ·
·m
35 / 90°
N
· ·· ·
·m
45 / 90°Application
Skid Plate Bolt
Drain Plug Bolt
Coolong Fan Shroud Bolt
Control Linkage Nut
Clutch Linkage Cylinder Nut
Exhaust Manifold Bolt
Propeller Shaft Bolt & Nut (Axle)
Propeller Shaft Bolt & Nut(T/C)
Engine Mounting Nut
Application
Cooling Fan Belt Pulley Bolt
Socket Bolt
Tighten The Bolt
End Cover Bolt
Crankshaft Bearing Cap Bolt
Ball Bearing
Camshaft Sprocket Bolt
Oil Pump Sprocket Bolt
Application
Connecting Rod Bolt
Application
12-Sided Stretch Bolt
Engine Assembly
Crankshaft Assembly
Piston
Flywheel
Cylinder Head
Application
Prechamber Threaded Ring
Cylinder Head Cover Bolt
Fuel Injsction Pipe Nut
Socket Bolt
Fuel Filter Pipe Bolt
Idle Pulley Bolt
Damper BoltN
· ·· ·
·m
130
10
18
25
25
23
21
Page 318 of 1463
1B3-16 OM600 ENGINE MECHANICAL
16. Remove the power steering pump lines.
Notice
Completely drain the fluid.
17. Disconnect the fuel feed line with prefilter from the feed
pump on injection pump.
18. Vehicle with automatic transmission.
Remove the hydraulic lines (19, 20) from oil cooler (2).
19. Disconnect the engine harness.
20. Disconnect the preheating time relay cable.
Page 346 of 1463
1B3-44 OM600 ENGINE MECHANICAL
22. Remove the cable channel.
23. Disconnect the cables from the glow plug sensor and
coolant temperature sensor.
24. Remove the heater pipe bracket from the oil filter.
25. Pry off the clamp and push the heater feed pipe forward
and then pull out the pipe.
Page 363 of 1463
OM600 ENGINE MECHANICAL 1B3-61
38. Replace the O-ring of heater feed pipe and install it to the
cylinder head.
Notice
For installation, clean the hole.
39. Install the bracket of heater feed pipe to the oil filter.
40. Install the fuel pipe and the accelerator control linkage.
41. Connect the fuel lines to the injection nozzles and to the
injection pump.
Box Wrench Insert 000 589 77 03 00
Tightening Torque 18 Nm