Yanmar BY Series Service Manual page 57

Periodic Maintenance Procedures
12/05
Figure 4-6
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Figure 4-6
4. Disconnect water sensor (Figure 4-6, (1)).
5. Turn the filter bowl (Figure 4-6, (5))
counterclockwise to remove.
6. Remove the old filter element.
7. Clean the filter bowl. Inspect the water sensor
(Figure 4-6, (1)) for damage. Inspect the bowl
seal (Figure 4-6, (2)).
NOTICE: When replacing fuel filters, always
pre-fill them with fresh, clean fuel to improve the
system's ability to be bled.
8. Lubricate the seal at the top of the new filter
element (Figure 4-6, (3)) and install.
9. Lubricate the filter bowl seal (Figure 4-6, (2))
and install the filter bowl (Figure 4-6, (5)). Turn
clockwise by hand to tighten.
10. Ensure drain plug (Figure 4-6, (4)) is securely
tightened.
11. Connect water sensor (Figure 4-6, (1)).
12. Open the fuel cock.
13. Connect the battery negative (-) cable.
BY Service Manual
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© 2009 Yanmar Marine International
PERIODIC MAINTENANCE
14. Bleed air from the fuel system and check for
leaks. See Bleed the Fuel System on
page 6-22.
Changing the Engine Oil and Replacing the
Engine Oil Filter Element
To change engine oil and replace the engine oil
filter element, see Changing the Engine Oil and
Replacing the Engine Oil Filter on page 4-9.
Checking / Replacing the Seawater Pump
and Alternator Belts
1. Disconnect battery negative (-) cable from the
battery.
2. Remove belt guard.
3. Check the seawater pump belt (Figure 4-7, (1))
and alternator belt (Figure 4-7, (2)) for wear,
cracks or damage. NOTICE: Avoid getting oil on
the V-belt. Oil will cause the belt to slip, stretch
and age prematurely.
Figure 4-7
( 1 )
Figure 4-7
4. Replace if necessary. See Replace Seawater
Pump Belt on page 7-19.
5. Install belt guard and connect battery negative
(-) cable.
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