Yanmar 4BY - Disconnect and Connect Quick-Connect Fittings; Remove and Install Hydraulic Oil Cooler

COOLING SYSTEM
BY Service Manual
7-13
Repair
7. Inspect the cap gasket and flange on the filler
neck for damage.
8. Check the rubber hose connecting the coolant
recovery tank to the heat exchanger. Be sure
the hose is securely connected and there is no
damage.
9. Pour coolant mix slowly into the heat exchanger
to prevent the formation of air pockets. Fill until
the heat exchanger is completely full.
10. Install the filler cap and tighten firmly.
11. Remove the coolant recovery tank cap and fill
with coolant mix to approximately 50 mm (2 in.)
below the full line. Replace cap. Never fill to the
full line.
12. After filling an empty cooling system, test-run
the engine for approximately five minutes and
recheck the engine coolant level in the coolant
recovery tank.
Disconnect and Connect
Quick-Connect Fittings
Disconnect
Figure 7-9
1. Pry metal clip (Figure 7-9, (1)) until it clicks into
position shown.
2. Disconnect fitting joint.
Connect
1. Push metal clip against the fitting into the
latched position.
2. Ensure the O-ring is in place and in good
condition.
3. Align the two fittings and push together until the
clip makes an audible click.
4. Check to be sure the connection is securely
latched by attempting to pull apart.
Remove and Install Hydraulic Oil
Cooler
Figure 7-10
1. Loosen clamps and remove seawater pipe
(Figure 7-10, (1)).
2. Loosen clamps and remove seawater pipe
(Figure 7-10, (2)).
3. Remove hydraulic lines from ports
(Figure 7-10, (3)). Allow fluid to drain into an
appropriate container. Dispose of waste
properly.
4. Loosen clamps (Figure 7-10, (4)) completely
and remove hydraulic oil cooler.
5. Inspect cooler for damage or blockage.
6. Install cooler and tighten clamps
(Figure 7-10, (4)).
7. Install hydraulic lines. Ensure copper washers
are in place.
8. Install seawater pipes (Figure 7-10, (2)) and
(Figure 7-10, (1)). Tighten clamps securely.
9. Add power steering fluid or marine gear oil as
appropriate.
10. Start engine and check for water or hydraulic
leaks.
0003694
(1)
0003659C
(1 )
(
3
)
(
3
)
(
4
)
(2)