Doosan DX60R Shop Manual page 298

Reassembly of Valve Guides
1. The valve guides are installed into the cylinder head with
an extremely tight press fit. Before installing the valve
guides, place the valve guides in a freezer for at least
twenty minutes This will cause the valve guides to
contract, making it easier to install the valve guides into
place.
2. Immediately after removing the valve guides from the
freezer, insert the valve guides (1, Figure 148) in their
proper positions.
3. Finish installing the valve guides (1, Figure 149) into the
cylinder head to the proper height (3, Figure 149) using
the valve guide installation tool (2, Figure 149). See
"Intake / Exhaust Valve and Guide" on page -95
Reassembly of Intake and Exhaust Valves
Always install new valve stem seals. The exhaust valve seals
can be identified by having yellow paint. Ensure they are
installed in the correct locations.
Engine
Page 118
IMPORTANT
Figure 148
Figure 149
2
3
1
FG008893
SP001693