Page 72
TROUBLESHOOTING
4. Attach the cylinder head lifting tool,
85109036, to the cylinder head.
5. Using a hoist, lower the cylinder head into a
container suitable for the pressure test. Fill
the container with 70°C (158°F) water.
55
Figure 55 — Testing for Air Leaks
6. With the pressure gauge connected to an air
supply and the connection disc on the
cylinder head, carefully open the gauge
control valve.
7. Set the pressure to 50 kPa (7.25 psi) and
hold the pressure for one minute.
8. Raise the pressure to 150 kPa (21.8 psi) and
close the stop valve. After two minutes,
check for a drop in pressure and for any air
bubbles forming around the cylinder head.
A drop in pressure and the appearance of air
bubbles indicates a leak(s) in the coolant, fuel or
oil passages. The source of the leak(s) must be
found and the cylinder head repaired or replaced
as required.
9. Lower the pressure in the cylinder head by
adjusting the knob on the pressure gauge
control valve.
10. Using a hoist, remove the cylinder head from
the water container.
11. Remove the sealing plates and connection
disc from the cylinder head. Using
compressed air, blow the water off the
cylinder head and out of all threaded holes.
Use care with the fuel passages to make sure
that no dirt enters the fuel channels. Dirt can
cause the unit injectors to be damaged.
Cylinder Liner and Piston Wear,
Check
Thoroughly clean the cylinder liners and pistons
before inspecting and measuring. To thoroughly
check for cracks, remove the cylinder liner from
the cylinder block. Mark the position of the
cylinder liner in the cylinder block before
removing it so it can be installed in the same
position during assembly.
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