Doosan DX60R Shop Manual page 288

Disassembly of 4-Valve Cylinder Head
Prepare a clean, flat working surface on a workbench large
enough to accommodate the cylinder head assembly. Discard
all gaskets, O-rings and seals. Use new gaskets, O-rings and
seals on reassembly of the cylinder head.
1. Drain the coolant from the engine into a suitable container.
See "Adjust Intake / Exhaust Valve Clearance" on
page -86
Identify all parts and their location using an appropriate
method. It is important that all parts are returned to the
same position during the reassembly process.
2. Remove the high pressure fuel injection lines (1, Figure
122). See "Removal of Fuel Injectors" on page -194
Remove or install the high-pressure fuel injection lines
as an assembly whenever possible. Disassembling the
high-pressure fuel injection lines from the retainers or
bending any of the fuel lines will make it difficult to
reinstall the fuel lines.
3. Disconnect the fuel return hose (2, Figure 122) from the
cylinder head.
4. Disconnect the hoses (3, Figure 122) from the cold start
device on the fuel injection pump.
This cooling water pipe is not used in electronically
controlled engines 4TNV98-E.
Instead, these engines use a solenoid valve and
connecting coupler but, when removing the cylinder head
only, it is not necessary to remove the connecting coupler.
5. Remove the turbocharger-to-intake manifold hose (1,
Figure 123) (if equipped).
6. Disconnect the electrical wire from the intake air heater
(12, Figure 123).
7. Remove the intake manifold bolts (11, Figure 123).
Remove the intake manifold (10, Figure 123). Discard the
intake manifold gasket (9, Figure 123).
8. Disconnect the turbocharger oil supply (2, Figure 123)
and the return lines (4, Figure 123) (if equipped).
9. Remove the exhaust manifold bolts (7, Figure 123).
Remove the exhaust manifold (6, Figure 123) with the
turbocharger attached. Discard the exhaust manifold
gasket. (5, Figure 123).
Engine
Page 108
CAUTION
CAUTION
Figure 122
Figure 123
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