Page 577 of 2053
1B3 -- 28 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
7. Belt detached from the base of rip.
8. Splits across the rips.
9. Sections of rip torn out.
10. Splits across several rips.
11. Splits across the back.
Page 578 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 29
D AEW OO M Y_2000
PRECHAMBER
Preceding Work : Removal of glow plug
Removal of fuel injection nozzle
1 Threaded Ring 130 N∙m (96 lb-ft) ...........
2 Prechamber3 Cylinder Head
Page 579 of 2053
1B3 -- 30 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
Tools Required
603 589 00 09 00 Serration Wrench
667589036300 SlidingHammer
Removal & Installation Procedure
1. Using the serration wrench (4), remove the threaded
ring (1).
Serration Wrench 603 589 00 09 00
2. Install the sliding hammer into the prechamber.
Sliding Hammer 667 589 03 63 00
3. Remove the perchamber (2).
Notice
After removing the prechamber, cover over the
bores with clean rag.
4. Inspect the prechamber.
Notice
If the prechamber seats in the cylinder head are
leaking or if the prechambers are replaced, the seal-
ing surfaces in the cylinder head must be rema-
chined.
Page 580 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 31
D AEW OO M Y_2000
Assembly Procedure
Notice
In case the prechambers are reused, inspect the
prechambers thoroughly, if the ball pin by heat and
fire is broken, it can not be used.
1. Clean the sealing surface of the prechamber.
2. Insert the prechamber into the cylinder head at the
same time aligning the cam on the collar of the pre-
chambers with the slots in the cylinder head.
Notice
If the spacer rings are fitted to the prechambers, the
spacer rings should be replaced with rings of the
same thickness.
Thickness of Spacer
Ring0.3, 0.6, 1.0 mm
3. Coat the threaded ring with oil and assemble the
ring by using the serration wrench.
Tightening Torque130 N∙m (96 lb-ft)
Page 581 of 2053
1B3 -- 32 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
MILLING OF PRECHAMBER SEALING SURFACE
1Drift
2 Sleeve
3 Milling Cutter4 Counter Sink (Special Tool -- 601 589 00 66)
5 Cylinder Head
Tools Required
601589006600 CounterSink
667 589 00 23 00 Height Gauge
Milling of the Prechamber Sealing Surface
Notice
The prechamber sealing surface may only be rema-
chined once with the cylinder head fitted. It is essen-
tial to adhere to the specified projection ’C’ of the
prechamber of 7.6 -- 8.1mm.
This ensures that the required clearance exists be-
tween prechamber and piston crown with the piston
in TDC. For this reason, spacer rings should be in-
serted on remachined sealing surfaces.
Thickness of spacers0.3, 0.6, 1.0 mm
If a spacer ring is already fitted, or a marking is
made on the cylinder head, the cylinder head must
be removed and size ’C’ measured if further rema-
chining is necessary on a prechamber sealing sur-
face.
Page 582 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 33
D AEW OO M Y_2000
1. Remove the injection nozzle.
2. Remove the prechamber.
3. Cover the prechamber bore to avoid any chips drop-
ping into the combustion chamber.
4. Remove the protective sleeve from the countersink
and rotate the countersink into the prechamber bore
to be machined as far as the stop.
Counter Sink 601 589 00 66 00
5. Maintain size ’X’ from the top edge of mandrel to the
top edge of the sleeve with the gauge.
Height Gauge 667 589 00 23 00
6. Measure the ’X’ by using a vernier caliper.
7. Mount the turning tool onto the countersink tool and
rotate to the right approx. 5 revolutions by applying
slight pressure.
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1B3 -- 34 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
8. Remeasure size ’X’ and compare it with the first
measurement and determine the thickness of
spacer ring.
Ex
Size before machining25.7 mm
Size after machining25.5 mm
The spacer ring should be selected so that it is at
least 0.1mm and not more than 0.3mm thicker than
the measured on the sealing surface. In this exam-
ple, the necessary thickness of spacer ring should
be within 0.3 ~ 0.5mm and the thickness of spacer
ring to be installed is 0.3mm.
9. Remove the countersink tool and clean the chips.
Notice
If the sealing surface is not completely flat, rema-
chine the sealing surface.
10. Remove rag from the prechamber bore and crank
the engine with starter motor to threw out any chips
which may have got into the combustion chamber.
11. Insert the proper spacer ring into the prechamber
sealing surface.
12. Punch a mark on the cylinder head above the pre-
chamber sealing surface which has been machined.
13. Install the prechambers.
Notice
If the cylinder head is removed, the projection ’C’ is
measured in place of size ’X’ and the appropriate
size of spacer ring selected.
Normal Projection (c)7.6 -- 8.1mm
Page 584 of 2053
OM600 ENGINE MECHANICAL 1B3 -- 35
D AEW OO M Y_2000
TDC (TDC SENSOR BRACKET) SETTING
Preceding Work : Removal of No.1 cylinder prechamber
1 Measuring Device
2 Dial Gauge
3 Cylinder Head
4 Piston Set at TDC........................
Tools Service
001589322100 DialGauge
601 589 07 21 00 Depth Gauge
667589012100 FixingDevice
Notice
DThe TDC sensor bracket must be adjusted in case
of followings.
DWhen replacing the TDC sensor bracket.
DWhen replacing the crankshaft, the hub or the
vibration damper.
DlWhen replacing or installing the timing case cover.
DAfter engine overhauling.
* If the cylinder head is removed, the measuring pin of
the dial gauge can be positioned on the piston
crown.
This is done by placing the magnetic dial holder on
the mating surface of the crankcase.