Yanmar 4TNV98, Service Manual

Page: 54 / 246

4TNV98 & 4TNE98 Diesel Engine Section 2. Periodic Maintenance 52
Check and Clean Radiator Fins
CAUTION
FLYING OBJECT HAZARD!
ALWAYS wear eye protection when servicing
the engine and when using compressed air or
high-pressure water. Dust, flying debris,
compressed air, pressurized water or steam
may injure your eyes.
Failure to comply may result in minor or
moderate injury.
Dirt and dust adhering to the radiator fins reduce
the cooling performance, causing overheating.
Make it a rule to check the radiator fins daily and
clean as needed.
Note that a typical radiator is shown in
Figure 5-10
for illustrative purposes only.
• Blow off dirt and dust from fins and radiator with
28 psi (0.19 MPa; 2 kgf/cm²) or less of
compressed air
(Figure 5-10, (1)) . Be careful not
to damage the fins with the compressed air.
• If there is a large amount of contamination on the
fins, apply detergent, thoroughly clean and rinse
with tap water.
CAUTION
NEVER use high-pressure water or compressed
air at greater than 28 psi (193 kPa; 19 686
mmAq) or a wire brush to clean the radiator fins.
Radiator fins damage easily.
Figure 5-10
Check and Adjust Cooling Fan V-Belt
Check and adjust the cooling fan V-belt every 250
hours of operation after the initial 50 hour V-belt
maintenance. See Check and Adjust Cooling Fan
V-Belt on page 47.
Check and Adjust the Governor Lever and
Engine Speed Control
The governor lever and engine speed control
(throttle lever, pedal, etc.) of the machine are
connected together by a throttle cable or rod. If the
cable becomes stretched, or the connections
loosen, the governor lever may not respond to
change of engine speed control position. This may
make operation of the machine unsafe. Check the
cable periodically and adjust if necessary.
NEVER force the throttle cable or pedal to move.
This may deform the governor lever or stretch the
cable and cause irregular operation of the engine
speed control.