Yanmar 4TNV98 Service Manual page 211

5. Inspect the condition of the V-belt. There must be
clearance (Figure 8-14, (1)) between the V-belt
and the bottom of the pulley groove. If there is no
clearance (Figure 8-14, (2)) between the V-belt
and the bottom of the pulley groove, replace the
V-belt.
Figure 8-14
6. Reinstall the V-belt. Tighten the V-belt to the
proper tension. See Check and Adjust Cooling
Fan V-Belt on page 47.
7. Reinstall and tighten the drain plug or close the
drain cock in the radiator. Reinstall and tighten
the engine block drain plug or reconnect the
coolant hose at the oil cooler.
8. Fill the radiator and engine with engine coolant.
See Drain, Flush and Refill Cooling System With
New Coolant on page 59.
CAUTION
Only use the engine coolant specified. Other
engine coolants may affect warranty coverage,
cause an internal buildup of rust and scale
and/or shorten engine life.
Prevent dirt and debris from contaminating the
engine coolant. Carefully clean the radiator cap
and the surrounding area before you remove
the cap.
NEVER mix different types of engine coolants.
This may adversely affect the properties of the
engine coolant.
4TNV98 & 4TNE98 Diesel Engine
209
Section 5. Cooling System