Page 649 of 2053
1B3 -- 100 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
6. Measure axial runout of ring gear (1) on a surface
plate.
LimitMax. 0.4mm
Notice
For correct measurement, put the flywheel on the
flat measuring board.
Dial Gauge 001 589 53 21 00
Dial Gauge Holder 363 589 02 21 00
Page 650 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 101
D AEW OO M Y_2000
HYDRAULIC VALVE CLEARANCE COMPENSATION ELEMENT CHECK
1 Cylinder Head Cover
2 Bolt 10N∙m (89 lb-in) .....................
3 Gasket Replace..........................4 Valve Tappet
5 Cylinder Head
Page 651 of 2053

1B3 -- 102 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
Checking
Notice
The noise which continues short time during short
travel (frequent starting of the engine) or engine
starting after a long time storage is normal operating
conditions. So, it does not need to be repaired. De-
termine the malfunctions in valve clearance com-
pensation device with noise through following tests.
If defective, replace as respectively.
1. Run the engine at more than 3000rpm for approx. 4
minutes.
2. Stop the engine. After 5minutes, check the engine
oil level and adjust if necessary.
3. Remove the cylinder head cover.
4. Check the valve tappets at TDC position of each cyl-
inders.
5. Using a drift, lightly press the valve tappet and mea-
sure clearance between the cam and valve tappet.
Notice
If the clearance exceeds 0.4mm, replace the valve
tappet.
6. If a valve tappet moves down too far in comparison
to the others, replace the valve tappet.
7. Rotate the engine and check the remaining valve
tappets.
Notice
DUnnecessary rotation of the engine will damage
the valve tappets.
DDo not rotate the engine by using the camshaft
sprocket bolt or to the opposite direction of the
engine rotation.
Page 652 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 103
D AEW OO M Y_2000
VALVE TAPPETS
Preceding Work : Removal of camshaft
1 Valve Tappet
2 Cylinder Head
3 Oil Gallery4 Seal Replace.............................
5 Screw Plug
Tools Required
102 589 03 40 00 Magnetic Bar
Page 653 of 2053
1B3 -- 104 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
Replacement Procedure
1. Pull out the valve tappet (1).
Magnetic Bar 102 589 03 40 00
2. Remove the plug (5) and blow compressed air into
the oil gallery (3). At this time, check that the outlet
bores(arrow) at the seat of the valve tappet are
clear.
3. Replace the seal (4) and tighten the plug (5).
4. Insert the new valve tappet.
Notice
Coat the valve tappet with oil.
Page 654 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 105
D AEW OO M Y_2000
VALVE SPRINGS CHECK
Preceding Work : Removal of valve spring
1 Valve Spring2 Spring Scale
Service Data
OuterdiameterWirediameterFreelengthAt preloadedOuterdiameterWirediameterFreelengthLengthTension (new)Limit
33.1 mm4.20 mm50.0 mm27 mm680 -- 740 N612 N
Page 655 of 2053
1B3 -- 106 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
VALVE SPRINGS (CYLINDER HEAD REMOVED)
Cylinder Head Removed
1 Valve Tappet
2 Valve Cotters
3 Spring Retainer
4 Valve Spring Check, replace if necessary....
5 Cylinder Head6 Stud Bolt 12N∙m (106 lb-in) ................
7Washer
8 Nut Replace, 25N∙m (18 lb-ft) ..............
9 Exhaust Manifold
Page 656 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 107
D AEW OO M Y_2000
Tools Required
102 589 03 40 00 Magnetic Bar
116 589 06 63 00 Magnetic Finger
601589015900AssemblingBoard
601 589 02 59 00 Supporting Bridge
667589003100PressLever
Removal & Installation Procedure
1. Remove the nuts (8) uniformly and then remove the
washer (7), exhaust manifold (9) and gasket.
Installation Notice
Check the stud bolt (6) for damage and replace if
necessary.
Tightening Torque12 N∙m (106 lb-in)
Replace the gasket and tighten the nuts (8).
Tightening Torque25 N∙m (18 lb-ft)
2. Install the assembling board (11) to the cylinder
head with 4 cylinder head blots (10).
Assembling Board 601 589 01 59 00
3. Pull out the valve tappet (1) with magnetic bar (12).
Notice
Place the valve tappets upside down (open end up-
ward).
Magnetic Bar 102 589 03 40 00
4. Install the supporting bridge (13) on the cylinder
head (5).
Supporting Bridge 601 589 02 59 00