Disassembly Of Camshaft And Timing Components - Yanmar 2TNV70 Service Manual

ENGINE
5. Remove the engine from the machine. Mount
the engine to a suitable engine repair stand
having adequate weight capacity.
6. Clean the engine by washing with solvent, air or
steam cleaning. Carefully operate to prevent
any foreign matter or fluids from entering the
engine, fuel system, or electrical components
remaining on the engine.
7. Drain the engine oil into a suitable container.
Remove oil filter.
8. Remove the cylinder head. See Disassembly of
Cylinder Head on page 6-19.
9. Remove the fuel injection pump from the gear
case only if it must be sent out for repair, or will
interfere with other procedures such as "hot
tank" cleaning. See Removal of Fuel Injection
Pump on page 7-12.
10. Remove the starter motor. See Removal of
Starter Motor on page 10-9.
Disassembly of Camshaft and Timing
Components
Discard all gaskets, O-rings and seals. Use new
gaskets, O-rings and seals on reassembly of
camshaft and timing components.
Removal of Timing Gear Case Cover
1. Remove the bolt and washer retaining the
crankshaft pulley.
IMPORTANT
Use care not to damage the threads in the
end of the crankshaft when removing the
crankshaft pulley.
2. Remove the crankshaft pulley with a gear puller.
3. Remove the bolts that retain the gear case
cover to the cylinder block and oil pan.
4. Remove the gear case cover (Figure 6-39, (1)).
5. Remove the dowel pins (Figure 6-39, (3)) and
O-ring (Figure 6-39, (2)).
6-36
Figure 6-39
Checking Timing Gear Backlash
Prior to removing the timing gears, measure the
gear backlash and determine the gear wear.
Note: Check the backlash between each pair of
mating gears. If not within specification,
replace both mating gears. Do not allow
the gear being checked to move axially
as excess end play could cause a false
reading. See Timing Gear Backlash on
page 6-7 for service limits.
(1)
C
C
(5)
1 – Fuel Injection Pump Drive Gear
2 – Camshaft Drive Gear
3 – Auxiliary Drive Gear (Optional)
4 – Crankshaft Drive Gear
5 – Idler Gear
Figure 6-40
TNV IDI Service Manual
Cylinder Block
(3)
(1)
(2)
0002181
(2)
(3)
B B
A
A
(4)
K0002190-01X