Yanmar 3JH5E Operation Manual page 90

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 72.
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 73.
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 replaced
periodically (every 1000 hours)
even if there is no damage.
82
Figure 15
There are two types of special service
tools for removing the impeller:
Puller A (standard)
Part No. 129671-92110
(B)
Figure 16
Puller A
M18x1.5
1. Remove the side cover of the seawater
pump.
2. Install puller (Figure 16, (A)) in the
impeller.
3. Turn the jack screw (Figure 16, (B))
clockwise to remove the impeller from
the pump body.
JH Series Operation Manual
(1)
0004510
(A)
0004501
Jack Screw B
M10x40 mm length