Yanmar 4JH45 Operation Manual page 79

12/05
Fuel filter
Figure 14
1. Close the fuel tank drain cock.
2. Remove the fuel filter with a filter
wrench.
Note: When removing the fuel filter,
hold the bottom of the fuel filter
with a cloth to prevent the fuel
from spilling. Wipe up any spilled
fuel immediately.
3. Apply a thin film of clean diesel fuel to
the sealing surface of the new filter
gasket.
Component
Fuel filter
4. Install a new filter and hand-tighten.
Use a filter wrench and tighten to 20 to
24 N·m (14.75 to 17.7 ft-lb).
5. Bleed the fuel system. See Bleeding
the Fuel System on page 38. Dispose
of waste properly.
6. Check for fuel leaks.
JH Series Operation Manual
056905-00X00
Part No.
129A00-55800
PERIODIC MAINTENANCE
Changing the Engine Oil and
Replacing the Engine Oil Filter
Element
See Changing the Engine Oil and
Replacing the Engine Oil Filter Element on
page 64.
Changing the Marine Gear Oil and
Replacing the Marine Gear Oil Filter
Element (if equipped)
See Changing the Marine Gear Oil and
Replacing the Marine Gear Oil Filter (If
Equipped) on page 65.
Checking or Replacing Seawater
Pump Impeller
1. Loosen side cover bolts and remove
the side cover.
2. Inspect the inside of the seawater
pump with a flashlight. If any of the
following are found, disassembly and
maintenance are required:
• Impeller blades are cracked or nicked.
Edges or surfaces of the blades are
marred or scratched.
• Wear plate is damaged.
3. If no damage is found when inspecting
the inside of the pump, install the
O-ring and side cover.
4. If a large amount of water leaks
continuously from the water drain line
below the seawater pump during
operation, replace the mechanical seal.
Consult authorized Yanmar Marine
dealer or distributor.
Replacing the Seawater Pump Impeller
Note: The impeller must be replaced
periodically (every 1000 hours)
even if there is no damage.
73