Yanmar 3TNV82A Service Manual page 198

ENGINE
2. Remove the two bolts (Figure 6-94, (3))
retaining the camshaft thrust plate
(Figure 6-94, (1)).
Figure 6-94
3. Rotate the engine in the engine stand so that
gravity causes the tappets (Figure 6-94, (5)) 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 (Figure 6-94, (2))
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
(Figure 6-94, (4)) 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.
6-72
(5)
(2)
(1)
(4)
(3)
0001966
Crankshaft and Camshaft Components
Removal of Gear Case or Front Plate
Note: The camshaft must be removed before
the gear case / front plate can be
removed. See Inspection of Camshaft on
page 6-82.
1. TNV94 - TNV106: Remove the oil pump.
Note: It is not necessary to remove the fuel
injection pump from the gear case / front
plate to remove the gear case / front
plate. If the fuel injection pump does not
need to be repaired, leaving it mounted
to the timing gear case / front plate will
eliminate the need to re-time it during
assembly. See Fuel Injection Pump on
page 7-16.
2. Remove the bolts (Figure 6-95, (4)).
3. Remove the gear case (Figure 6-95, (1)) or
front plate from the cylinder block. Thoroughly
clean all old sealant from the mating surfaces.
4. Inspect and measure the camshaft bushing.
See Camshaft on page 6-10 for the service
limit. If damaged or worn beyond service limits,
remove the camshaft bushing
(Figure 6-95, (3)).
5. TNV94 - TNV106: Remove two O-rings
(Figure 6-95, (2)).
(2)
Figure 6-95
TNV DI Service Manual
(1)
(3)
(4)
0001737B