OM600 ENGINE MECHANICAL 1B3-177
CYLINDER HEAD PRESSURE LEAKAGE TEST Preceding Work : Removal of the cylinder head Removal of the exhaust manifold Removal of the valve
1 Feed Pipe
2 Bolt
3 Return Connection
4 Gasket ................................................................ Replace
5 Coolant Gallery ................................................... Sealing
6 Pressure Measuring Plate ..................................Completely tight to the cylinder head
7 Cylinder Head .....................................................
Immerse with pressure measuring plate into warm water of approx. 60 °C and pressurize with compressed
airof 2 bar.
Notice If air bubbles are seen, replace the cylinderhead.
Tools Required
115 589 34 63 00 Pressure Measuring Plate 601 589 00 25 00 Suspension Device
UNIT REPAIR
1B3-178 OM600 ENGINE MECHANICALHeight ‘A’
(cylinder head surface - cylinder head cover surface) Minimum height after machiningPermissible unevenness of parting surface Permissible variation of parallelism (longitud. Direction) Peak-to-valley height
Valve arrears ‘a’
Prechamber protrusion
Service Data
In longitudinal direction In transverse direction Intake valve Exhaust valve
142.9 - 143.1mm
142.5mm0.08mm0.0mm
Max. 0.1mm
0.0017mm
0.1 - 0.7mm 0.1 - 0.7mm 7.6 - 8.1mm
FACING CYLINDER HEAD MATING SURFACE
Preceding Work : Removal of prechamber Cylinder head pressure leakage test
1 Valve
2 Cylinder Head
3 Prechamber
A Height of Cylinder Head B Longitudinal Direction
C Transverse Direction
a Valve Arrears
b Prechamber Protrusion
OM600 ENGINE MECHANICAL 1B3-179
Measurement Procedure
1. Measure height ‘A’ .
Limit 142.5 mm
Notice If the height is less than 142.5mm, replace the cylinder head.
2. Insert the valve (1) and measure valve arrears ‘a’.
Valve Arrears ‘a’ 0.1 - 0.7 mm
Notice If out of standard, machine the valve seat.
3. Install the prechamber and measure protrusion ‘C’.
Protrusion ‘C’ 7.6 - 8.1mm
4. Assemble the engine and check the valve timing.