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MAINTENANCE
3.
Place a container under the fuel prefilter cartridge to re-
ceive the fuel.
4.
Loosen the drain valve (2) and drain water and sediments
from transparent cup (3), and also drain all the fuel from fil-
ter cartridge (4).
5.
Turn the transparent cup (3) counterclockwise to remove it
by using the filter wrench.
This cup is used again.
6.
Turn the filter cartridge (4) counterclockwise by using the
filter wrench, and remove it.
7.
Install currently removed transparent cup (3) to the bottom of the new filter cartridge.
At this time, be sure to replace O-ring (5) with a new one.
When installing the transparent cup, thinly apply oil to the packing surface, contact it to the sealing surface
of filter cartridge (4), and then tighten it 1/4 to 1/2 turn.
If the transparent cup is fastened too much, the O-ring will be damaged and this leads to leakage of fuel. If
it is too loose, fuel will also leak from gaps of the O-ring. Be sure to observe the tightening angle.
8.
Clean the filter head.
9.
Fill the new filter cartridge with clean fuel, thinly apply oil to the packing surface, then install it to the filter
head.
NOTICE
•
When filling the filter cartridge with fuel, do not re-
move cap (B). Always fill with fuel from 8 small
holes (A) on the dirty side.
•
After filling with fuel, remove cap (B) and install
the fuel filter.
•
Always fill with clean fuel. Be careful not to let any
dirt or dust get into the fuel. In particular, center
portion is the clean side, so do not remove cap (B)
when filling with fuel. Be careful not to let dirt or
dust get into the center portion on the clean side.
When installing the cartridge, tighten it until the packing surface contacts the seal surface of the filter holder,
then tighten it 3/4 of a turn.
If the filter cartridge is tightened too much, the packing may be damaged and this will cause the leakage of
fuel. If it is not tightened enough, fuel will leak through the gap at packing. Be sure to observe the tightening
angle.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
10. Check that drain valve (2) is closed securely.
11. Turn the valve (1) to OPEN position (O).
12. After completing the replacement of filter cartridge (4), bleed air according to the following procedure.
1)
Fill up the fuel tank with fuel (to the level where the float is at the highest position).
2)
Loosen the knob of feed pump (6), pull it out, then pump it in and out until the movement becomes
heavy.
REMARK
•
It is not necessary to remove the plugs at the fuel prefilter head and at the fuel main filter head.
•
When the engine runs out of fuel, use the same procedure to operate feed pump (6) and bleed the air.
13. After bleeding air, push in the knob of feed pump (6) and tighten it.
14. After replacing the filter cartridge (4), start and run the engine at low idle for 10 minutes.
15. Check for leakage of oil from the filter seal surface and transparent cup mounting face.
WENAM00111
MAINTENANCE PROCEDURE
4-51
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