Yanmar 6BY2 - Inspect and Clean Hydraulic Oil Cooler; Remove and Install Charge Air Cooler

COOLING SYSTEM
Repair
7-12 BY Service Manual
© 2009 Yanmar Marine International
Inspect and Clean Hydraulic Oil
Cooler
1. Drain cooling system. See Drain and Refill
Seawater Cooling System on page 7-8.
2. Loosen clamps (Figure 7-11, (1)) and remove
seawater pipe (Figure 7-11, (2)).
Figure 7-11
Figure 7-11
3. Remove any loose debris from inside cooler.
4. Visually inspect cooling tubes for evidence of
debris, corrosion or damage. NOTICE: If the
cooling tubes are plugged, remove cooler and
thoroughly backflush with water. NEVER clean
using a wooden dowel or wire brush. Damage
or inability to clean sufficiently will require repair
by a radiator shop or replacement of oil cooler.
5. Install seawater pipe (Figure 7-11, (2)) and
tighten clamps (Figure 7-11, (1)).
6. Start engine and check for water leaks.
Remove and Install Charge Air
Cooler
1. Drain seawater system. See Drain and Refill
Seawater Cooling System on page 7-8.
2. Disconnect seawater pipe between hydraulic oil
cooler and charge air cooler (Figure 7-12, (1)).
Figure 7-12
Figure 7-12
3. Disconnect seawater pipe between charge air
cooler and heat exchanger (Figure 7-12, (2)).
4. Disconnect pipe between charge air cooler and
turbocharger (Figure 7-12, (3)).
5. Remove pipe between charge air cooler and
intake manifold (Figure 7-12, (4)).
6. Remove two bolts (Figure 7-12, (5)) that attach
heat exchanger to charge air cooler.
7. Remove four lower bolts (Figure 7-12, (6)) that
attach charge air cooler. Remove charge air
cooler assembly from engine.
8. Disassemble and repair as necessary. See
Disassemble and Assemble Charge Air Cooler
on page 7-13.
9. Install charge air cooler and start all bolts.
10. Tighten mounting bolts to 46 N·m (34 ft-lb).
11. Install pipe between intake manifold and charge
air cooler.
12. Install and secure air inlet pipe between
turbocharger and charge air cooler.
0003655A
(1)
(
1
)
(
2
)
0006624
(1)
(
2
)
(3)
(
4
)
(
5
)
(
6
)