TROUBLESHOOTING
Page 71
4. Check the oil nozzle in the CCV base for dirt
and any accumulated oily deposits. Clean
the nozzle as required. If unable to clean the
nozzle sufficiently, replace the complete
CCV separator assembly.
52
Figure 52 — Oil Nozzle (Separator Base)
If the oil nozzle becomes clogged, the oil
pressure is reduced and the turbine does not
rotate as it should.
Cylinder Head, Pressure Test
(Cylinder Head Removed)
The following procedure applies for MACK MP7,
MP8 and MP10 engine cylinder heads. While the
procedure is typical, the sealing tools required will
be different for each MP engine series.
1. Clean the contact surfaces on the cylinder
head. Install the:
앫 Sealing plates, 9990105 (MP7),
9809696 and 9998266 (MP8) or
9990164 (MP10), onto the cylinder
head coolant ports using cylinder head
bolts and M16 nuts
앫 Connection disc, 9990107, in position
on the thermostat housing bore
앫 Plug, M12x1.5, in the temperature
sensor hole
앫 Sealing plate, 88800215, on the side of
the cylinder head
53
Figure 53 — Sealing Plates Installed (Typical)
2. Connect the pressure gauge, 9996662, to a
suitable air supply. Connect the pressure
gauge hose to the connection disc on the
cylinder head. Adjust the pressure to
100 kPa (14.5 psi) using the control valve.
Close the stop valve for two minutes. The
pressure should not fall.
3. Lower the pressure in the cylinder head by
adjusting the knob on the pressure gauge
control valve.
54
Figure 54 — Pressure Gauge Adjustment Knob
1. Sealing Plates (Cooling
Ports)
2. Sealing Plate (By-Pass
Port)
3. Connection Disc
(Thermostat Housing)
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