Doosan DX60R Shop Manual page 314

Removal of Camshaft
1. Before removing the camshaft, check the camshaft end
play.
• Method A: Install a dial indicator (1, Figure 175) on
the cylinder block. Move the camshaft (2, Figure
175) back and forth to measure the end play. Record
the measurement. See "Camshaft" on page -97 for
the service limit.
• Method B: Use a feeler gauge to measure the
clearance between the thrust plate (1, Figure 176) and
front camshaft bearing (2, Figure 176). See "Thrust
Bearing" on page -98 for the service limit.
2. Remove the two bolts (3, Figure 177) retaining the
camshaft thrust plate (1, Figure 177).
3. Rotate the engine in the engine stand so that gravity
causes the tappets (5, Figure 177) to drop away from the
camshaft lobes.
NOTE: Rotate the camshaft at least two turns to "bump"
any sticking tappets away from the camshaft.
4. Slowly pull the camshaft (2, Figure 177) assembly out of
the engine being careful not to damage the front camshaft
bushing.
NOTE:
If the engine is not installed on an engine repair
fixture, stand the engine upright on the flywheel
end mounting flange. Rotate the camshaft at
least two turns to bump the tappets out of the
way to prevent the tappets from interfering with
the removal of the camshaft.
NOTE:
The tappets are "mushroom" shaped and must
be removed from inside the engine crankcase.
5. Remove the tappets. Mark the tappets so they can be
reinstalled in the same location.
6. Remove the camshaft drive gear (4, Figure 177) only if the
gear or camshaft require replacement. Use a knife-edge
puller and a press to remove the gear. The gear is a
shrink-fit and will need to be heated to 356° - 392°F (180° -
200°C) to remove.
Engine
Page 134
Figure 175
Figure 176
Figure 177
SP001693