Page 294 of 1463
M161 ENGINE MECHANICAL 1B2-105
OIL DIPSTICK GUIDE TUBE
1 Oil Dipstick Level Gauge
2 Oil Dipstick Guide Tube
3 O-ring
Removal & Installation Procedure
1. Pull out the oil dipstick level gauge (1).
2. Unscrew the bolt (4) and remove the oil dipstick guide
tube (2).
Installation Notice4 Bolt (M6 X 16, 1 piece)........................... 9-11 Nm
5 Clamp
Tightening Torque 9 - 11 Nm
It is very hard to remove the oil dipstick guide tube without
special tool. If it is not necessary, do not remove the guide
tube.
3. Installation should follow the removal procedure in the
reverse order.
4. Check for leaks by starting the engine.
Page 296 of 1463
M161 ENGINE MECHANICAL 1B2-107
Tools Required
102 589 00 15 00 Drift
Replacement Procedure
1. Remove the intake and exhaust manifolds.
2. Pull back the core plug until the end of one side comes out
using the screw driver.
3. Pull out the plug carefully using a pliers.
5. Press in new plug using a drift.
Notice
Wait for about 45minutes before filling the coolant so that
the Loctite 241 hardens.
6. Warm up the engine and check the coolant for leaks. 4. Clean the sealing surface and apply Loctite 241.
Page 302 of 1463
M161 ENGINE MECHANICAL 1B2-113
Measurement of Mating Surface
1. Measure the height (H) of the cylinder head (refer to Service
data standard
).
2. Check the mating surface of the cylinder head.
3. Mill the sharp edge of the combustion chamber.
4. Re-measure the height (H) of the cylinder head.
5. Seal the intake and exhaust valves.
6. Measure the dimension (T) between the camshaft bearing
and the valve system (refer to
Service data standard).
7. Mill the cylinder head valve seat (refer to
Service data
standard
).
Universal Tool
Surface Grinding MachineSceledum, Type RTY
Roaro
Schio/Italy
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 329 of 1463
OM600 ENGINE MECHANICAL 1B3-27
Inspection Procedure
lMark poly V-belt at a clearly visible point with chalk.
lRotate the engine and check the belt.
Notice
If one of the following types of damage is found, replace
the belt.
1. Rubber lumps in the base of rips.
2. Dirt or grit ingrained.
5. Cord torn out at the side.
6. Outer cords frayed. 3. Pointed rips.
4. Belt cord visible in the base of rips.
Page 339 of 1463

OM600 ENGINE MECHANICAL 1B3-37
CYLINDER HEAD
1 Fuel Injection Pipe.....................................18Nm
2 Cylinder Head
3 Gasket ................................................... Replace
4 Bolt............................................................25Nm
5 Washer
6 Clamp
7 Heater Feed Pipe
8 Bolt
9 Washer
1 0 Bolt
11 Nozzle Washer....................................... Replace
12 Fuel Injection Nozzle............................35-40 Nm
13 Hexagon Socket Bolt................................. 25 Nm
14 Washer
1 5 Bolt........................................................... 25 Nm
16 Cylinder Head Bolt..............................See Table
17 Cylinder Head Cover
1 8 Bolt........................................................... 10 Nm
19 Gasket
2 0 Camshaft21 Camshaft Drive Sprocket....................... Replace
22 Washer
23 Bolt(12-Sided) ..................................25Nm + 90°
24 Sliding Rail
25 Sliding Rail Pin
26 Sliding Rail Pin
27 Chain Tensioner....................................... 80 Nm
28 Gasket ................................................... Replace
29 Cooling Fan.............................................. Check
30 Hexagon Socket Bolt................................. 45 Nm
31 Tensioning Lever
3 2 Bolt........................................................... 25 Nm
3 3 Bolt
34 Nut ............................................................ 23 Nm
35 Fuel Filter
36 Turbo Charger
37 Intake Duct
38 Gasket ................................................... Replace
39 Intake Manifold
Page 350 of 1463
1B3-48 OM600 ENGINE MECHANICAL
38. Remove the camshaft bearing cap bolts according to the
numerical sequence.
Notice
Remove the No.1 bolts first and then remove the No. 2
bolts. Do not remove the bolts at a time completely but
remove them step by step evenly or camshaft can be
seriously damaged.
OM662LA
39. Remove the bearing caps and then pull out the
camshaft(20) upward.
Notice
Be careful not to miss the locking washer.
40. Remove the locking washer.
Notice
Check the locking washer and replace if necessary.
OM661LA
Page 357 of 1463
OM600 ENGINE MECHANICAL 1B3-55
12. Install the idle pulley and fit the closing cover.
Tightening Torque 25 Nm
13. Insert the tensioning lever(31) and install the spring.
14. Install the damper.
Tightening Torque 23 Nm
Notice
Insert the tensioning lever bolts onto the mounting hole.
15. Insert the locking washer.
16. Inspect the valve tappet and check that the tappet moves
smoothly.