Every 1000 Hours Of Operation - Yanmar 4JH45 Operation Manual

PERIODIC MAINTENANCE

Every 1000 Hours of Operation

Perform the following maintenance every
1000 hours or 4 years of operation,
whichever comes first.
• Replacing the Seawater Pump
Impeller
• Cleaning and Checking the Seawater
Passages
• Checking Diaphragm Assembly
(4JH45/4JH57 Only)
• Replacing the Alternator V-ribbed belt
• Adjusting Intake/Exhaust Valve
Clearance
• Checking the Remote Control Cable
Operation
• Adjusting the Propeller Shaft
Alignment
Replacing the Seawater Pump
Impeller
The seawater impeller must be replaced
every 1000 hours even if it is not damaged.
See Checking or Replacing Seawater
Pump Impeller on page 73.
78
Cleaning and Checking the
Seawater Passages
After prolonged use, clean the seawater
passages to remove trash, scale, rust and
other contaminants that collect in the
cooling water passages. This can cause
declining cooling performance. The
following items need to be inspected:
• Heat Exchanger
• Pressure Cap
Consult authorized Yanmar Marine dealer
or distributor.
Checking Diaphragm Assembly
(4JH45/4JH57 Only)
(2)
(3)
(4)
(9)
(8)
(7)
Figure 23
1 – Diaphragm Cover
2 – Spring
3 – Center Plate
4 – Diaphragm
5 – Rocker Arm Cover
6 – Breather Baffle
7 – Baffle Plate
8 – Intake Silencer
9 – Breather Pipe
Consult authorized Yanmar Marine dealer
or distributor.
JH Series Operation Manual
(1)
(5)
(6)
0003628