Yanmar 4BY - Page 180

COOLING SYSTEM
BY Service Manual
7-21
Repair
Figure 7-25
3. Disconnect seawater supply hose from
seawater pump.
4. Disconnect seawater pump-to-hydraulic oil
cooler pipe (Figure 7-25, (1)).
5. Remove three bolts (Figure 7-25, (2)) and
remove seawater pump.
6. Repair as necessary.
7. Installation is in the reverse of removal.
8. Install seawater pump belt. See Replace
Seawater Pump Belt on page 7-21.
9. Connect battery negative cable.
Replace Seawater Pump Belt
1. Disconnect battery negative (-) cable from the
battery.
2. Remove belt guard.
3. Check belt tension. If belt is loose, it must be
replaced.
4. Cut seawater belt to remove.
5. Install new belt on crankshaft pulley and around
seawater pump pulley as far as possible.
Figure 7-26
6. Install special tool (Figure 7-26, (1)) between
seawater pump pulley and belt.
7. Roll the belt onto the pulley by rotating
crankshaft using a socket and breaker bar on
the crankshaft pulley bolt (Figure 7-26, (2)). Lift
end of tool while rotating.
IMPORTANT
Ensure belt is correctly engaged in all
grooves of both pulleys.
8. Install belt guard.
9. Connect battery negative (-) cable. Start engine
and verify pump operation.
0003697
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A CAUTION
PINCH HAZARD!
Use care not to catch finger between
belt and pulley while installing belt.
Failure to comply may result in minor or
moderate injury.
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0003691
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