Yanmar BY Series Service Manual page 171

Repair
12/05
Figure 7-21
( 1 )
( 2 )
Figure 7-21
Note: Coolant hoses shown removed for clarity
Figure 7-21 and Figure 7-22.
5. Remove the three thermostat housing bolts
(Figure 7-22, (1)) and remove the thermostat
housing assembly.
Figure 7-22
Figure 7-22
6. Test thermostat as required. See Test
Thermostat on page 7-8. Replace as needed.
Note: When replacing the thermostat or
housing, replace as an assembly. The
thermostat and housing are serviced as
a single assembly.
BY Service Manual
0006648
( 1 )
0006650
© 2009 Yanmar Marine International
Installation
1. Clean the thermostat housing and mounting
surfaces Figure 7-21.
NOTICE: Avoid damaging the sealing surface of
the thermostat housing and exhaust manifold
during cleaning.
Figure 7-23
Figure 7-23
2. Using a new thermostat housing seal, install
and tighten the thermostat housing assembly.
Tighten mounting bolts to 9.5 N·m (84 in.-lb).
3. Install and tighten the coolant hose connecting
the thermostat housing to the coolant pump. To
connect the clips on the coolant hose see,
Disconnect and Connect Quick-Connect
Fittings on page 7-11.
4. Install and tighten the coolant hose connecting
the thermostat housing to heat exchanger.
5. Install and tighten all air pipe and coolant hoses
removed during disassembly.
6. Fill the system with coolant. See Drain and Fill
Closed Cooling System on page 7-10.
7. Start the engine and check for coolant leaks.
Check the level of the coolant and add more as
necessary.
COOLING SYSTEM
0006651
7-17