Yanmar 6BY2 - Disassemble and Assemble Heat Exchanger

COOLING SYSTEM
Repair
7-14 BY Service Manual
© 2009 Yanmar Marine International
8. Disassemble, inspect and clean heat exchanger
as necessary. See Disassemble and Assemble
Heat Exchanger on page 7-14.
9. Install the heat exchanger assembly on the
engine. Install and tighten bolts
(Figure 7-14, (5, 6 and 7)).
10. Install two new O-rings on coolant pipe
(Figure 7-15, (1)) and connect to heat
exchanger.
Figure 7-15
Figure 7-15
11. Connect remaining seawater and coolant hoses
to heat exchanger.
12. Fill the system with coolant. See Drain and Fill
Closed Cooling System on page 7-10.
13. Start the engine and check for coolant leaks.
Check coolant level and fill as necessary.
Disassemble and Assemble Heat
Exchanger
1. Remove heat exchanger from engine. See
Remove and Install Heat Exchanger on
page 7-13.
2. Remove outlet cover (Figure 7-16, (1)) and
spacer (Figure 7-16, (2)).
Figure 7-16
Figure 7-16
3. Remove inlet cover (Figure 7-16, (5)).
4. Pull core from housing.
5. Remove O-rings (Figure 7-16, (3 and 4)).
6. Remove anode (Figure 7-16, (7)) and copper
gasket (Figure 7-16, (6)).
7. NOTICE: NEVER use caustic soda to clean the
components. Use paraffin-based engine
detergent to clean the cooler element.
Thoroughly flush and rinse all components.
8. If any internal deposits remain in the tubes,
consult a local radiator repair shop.
Note: ALWAYS install new O-rings.
9. Install new O-rings (Figure 7-16, (4)) on cooler
core.
10. Install cooler core and inlet cover
(Figure 7-16, (5)).
11. Install one O-ring (Figure 7-16, (3)) between
core and housing (Figure 7-16, (8)).
0003695
(
1
)
0006520
(1)
(7)
(6)
(8)
(2)
(3)
(4)
(5)