Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
6-5
Changing Fuel Filters while Engine in Operation
To replace the fuel filters while the engine is in operation, be sure to run the engine under no load low idling
and at rated speed.
If the fuel filter is replaced during the engine is in high-speed operation, fuel can leak from the switchover
lever.
1 Clean the area around the fuel filters.
2 Place a fuel receiving tray under the fuel filters.
3 Set the fuel filter handle to the "“Left-CLOSE,
Right-OPEN”.
4 Using a filter wrench, remove 2 fuel filters either
from left side or right side.
5 Coat the gaskets of new fuel filters with clean
fuel.
6 Mount the new fuel filters to the bracket.
Tighten each filter until it contacts the bracket,
the further tighten 3/4 to 1 turn by hand.
7 Set the handle to the “Left-AIR PURGE, Right-
OPEN”.
8 Loosen the air vent plug of the left side fuel filter.
9 When the fuel flows from the air vent plug no
longer contains air bubbles, tighten the air vent
plug.
10 Return the handle to the "Left-OPEN, Right-
CLOSE”.
11 Using the filter wrench, remove 2 right fuel filters.
12 Apply clean fuel to the gasket on the new fuel fil-
ters.
13 Install the fuel filters. When the gasket contacts
the mounting surface on filter bracket, further rotate 3/4 to full turn.
14 Set the fuel filter handle to the “Right-AIR PURGE, Left-OPEN” position.
15 Loosen the air vent plug of the right side fuel filter.
16 When the fuel flows from the air vent plug no longer contains air bubbles, tighten the air vwnt plug.
17 Return the handle to the NORMAL position.
18 Start the engine, and let it under no load low idling for several minutes.
19 Check each fuel filter for fuel leaks. If fuel leaks from a filter, loosen the filter and check the gasket for
scratches or other abnormalities.
fig.6-8 Fuel filter switchover handle
fig.6-9 Changing fuel filters (cartridge type)
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