Yanmar 3JH4E, Operation Manual

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10. Install the fire-resistant cover and
tighten the hose clamp.
11. Bleed the fuel system. See Bleeding
the Fuel System on page 30.
12. Dispose of waste properly.
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 61.
Changing the Marine Gear Oil and
Replacing the Marine Gear Oil Filter
Element (If Equipped)
See Replace the Marine Gear Oil Filter (If
Equipped) and Change the Marine Gear
Oil on page 62.
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.
See your authorized Yanmar marine
dealer or distributor.
Replacing the Seawater Pump Impeller
Note: The impeller must be replace
periodically (every 1000 hours) even if there
is no damage.
0004510
(1)
Figure 15
There are two types of special service tools
for removing the impeller:
Puller A (Standard) Part No.
129671-92110
0004501
(B)
(A)
Figure 16
Puller A Jack Screw B
M18 x 1.5 M10 x 40 mm length
1. Remove the side cover of the seawater
pump.
2. Install puller (Figure 16, (A)) in the
impeller.
PERIODIC MAINTENANCE
JH4 Series Operation Manual 69