Page 198 of 1574
1B2-46 M161 ENGINE MECHANICAL
8. Unscrew the bolts (A).Installation Notice
Tightening Torque 22.5 - 27.5 Nm
9. Remove the belt pulley and vibration damper. Installation Notice (Center Bolt)
Tightening Torque 1st step 180 - 220 Nm 2nd step 80
° - 100 °
10. Unscrew the bolts (1, 2) on timing gear case cover and
remove the timing gear case cover. Installation Notice
Tightening Torque 22.5 - 27.5 Nm
Notice Be careful not to damage the cylinder head gasket.
11. Remove the radial shaft seal
NoticeInstallation note replace the seal with new one.
12. Clean the timing gear case cover and crankcase sealing surface.
13. Replace the O-ring with new one and apply the sealant on the sealing surface.NoticeBe careful not to stain the oil chamber of chain tensioner with the sealant.
14. Installation should follow the removal precedure in the reverse order.
15. Warm up the engine and check for oil leaks.
Page 266 of 1574

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 otherwisenoted.
Specifications . . . . . . . . . . . . . . . . . . . . . . . 1B3-2Fastener 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 268 of 1574
OM600 ENGINE MECHANICAL 1B3-3
N
m
12 2525
25 / 90 °
N
m
1010 23 32 4
2380 23Application
Stud Bolt Exhaust Manifold Not CamShaft Bearing Cap Bolt
12-Sided Bolt (M11)
Application
Oil Pan Bolt-Socket Bolt
Oil Pan Bolt- M6
Oil Pan Bolt- M23Belt Pulley Bolt Guide Pulley Bolt Guide Pulley Bracket Nut
Chain Tensioner
Tesioning Lever Bolt
Cylinder Head
Application
Camshaft Bearing Cap Bolt Camshaft Sprocket Bolt Exhaust Pipe Bolt& Nut
Chain TensionerInjection NozzleIntake Manifold Not Injection Nozzle Pipe Not
Oil Dipstick Tube BoltScrew Plug M18 x 15 N
m
25
25 / 90 °
25804025 18 1050
Cam Support & Shaft
Timing Cover
Page 328 of 1574

OM600 ENGINE MECHANICAL 1B3-63
TIMING CASE COVER
Preceding Work : Removal of the cooling fanRmoval of the V-belt tensioning device Removal of the vibration damper and hub Removal of the alternator
1 Bolt............................................................ 10Nm
2 Cylinder Head Cover
3 Gasket ................................................... Replace
4 Socket Bolt ................................................ 25Nm
5 Fuel Filter
6 Square Nut
7 Oil Pan
8 Socket Bolt ................................................ 10Nm
9 Bolt .................................................... M6 : 10Nm
M8 : 23Nm 10 Power Steering Pump
11 Bolt
12 Belt Pulley 13 Bolt
............................................................ 32Nm
14 Timing Case Cover
15 Bolt ............................................................ 23Nm
16 Alternator Bracket
17 Bolt ............................................................ 45Nm
18 Bolt ............................................................ 25Nm
19 Bolt ............................................................ 10Nm
20 Closing Cover
21 Socket Bolt ................................................ 23Nm
22 Guide Pulley
23 Bolt .............................................................. 9Nm
24 Guide Pulley Bracket
25 Nut ............................................................. 23Nm
Page 340 of 1574
OM600 ENGINE MECHANICAL 1B3-75
Sectional View
3 Socket Bolt
4 Crankshaft Belt Pulley
5 Vibration Damper
6 Bolt
7 Washer
8 Straight Pin
Notice The mounting position of vibration damper is fixed by straight pin (8).
Tools Required 602 589 00 40 00 Engine Lock103 589 00 30 00 Puller 9 Hub
11 Radial Seal
12 Timing Gear Case Cover
13 Key
14 Crankshaft Sprocket
16 Crankshaft
Page 341 of 1574
1B3-76 OM600 ENGINE MECHANICAL
Removal Procedure
1. Remove the starter motor and install the engine lock intothe wheel ring gear.
Engine Lock 602 589 00 40 00
2. Remove the poly V-belt.
3. Remove the cooling fan. NoticeKeep the fan in vertical position.
4. Remove the cooling fan belt pulley (2).
5. Place alignment marks (arrow) on the vibration damper (5) and crankshaft belt pulley (4).
6. Remove the timing sensor bracket. Notice
Remove if necessary.
Page 344 of 1574
OM600 ENGINE MECHANICAL 1B3-79
5. Install the timing sensor bracket.Notice See the ‘TDC setting ’.
6. Install the cooling fan pulley.
Tightening Torque 10 Nm
7. Install the cooling fan.
8. Install the fan belt.
9. Remove the engine lock.
Page 417 of 1574
1B3-152 OM600 ENGINE MECHANICAL
CYLINDER HEAD GUIDE RAIL
Preceding Work : Removal of the cooling fanRemoval of poly V-belt
Removal of chain tensioner
1 Cylinder Head Cover
2 Bolt............................................................ 10Nm
3 Gasket ................................................... Replace
4 Camshaft Sprocket
5 Washer
6 12-Sided Bolt (M11) ............ Inspect, 25Nm + 90 °
7 Tensioning Lever
8 Bolt ............................................................ 23Nm9 Bearing Pin
........................... Sealing Compound
10 Guide Rail
11 Bearing Pin
12 Guide Pulley
13 Socket Bolt ................................................ 23Nm
14 Closing Cover
15 Spring
16 Timing Chain