Yanmar 4TNV98 Service Manual page 139

Figure 6-144
(1) Fuel Injection Pump Gea.r
(2) Camshaft Gear.
(3) Optional Accessory Drive Gear.
(4) Crankshaft Gear.
(5) Direction of Rotation.
(6) Oil Pump Gear.
(7) Idler Gear.
3. Lubricate the idler gear (Figure 6-145, (2)),
bushing (Figure 6-145, (3)) and idler gear shaft
(Figure 6-145, (1)) with clean engine oil.
Figure 6-145
4. Align the timing gears as shown in (Figure 6-144).
5. Reinstall the idler gear and idler gear shaft. Be
sure the oil hole in the bushing is facing toward
the top of the engine.
6. Ensure all three timing marks (Figure 6-144, (A,
B, C)) are aligned.
7. When all gears are properly aligned, tighten the
idler gear retaining bolts to specified torque. See
Special Torque Chart on page 73 for specifications.
4TNV98 & 4TNE98 Diesel Engine
Installation of Gear Case Cover
1. Apply a continuous bead of Three Bond Liquid
Gasket No. 1212, Yanmar Part No. 977770-
01212 to the mounting area of the gear case
cover (Figure 6-146, (1)). Be sure to circle the
bolt holes.
2. Reinstall and tighten the gear case cover bolts.
3. Reinstall the crankshaft pulley.
4. Reinstall the washer and bolt. Tighten the bolt to
the specified torque. See Special Torque Chart on
page 73 for specifications.
137
Figure 6-146
Figure 6-147
Section 3. Engine