Remove And Install Thermostat - Yanmar BY Series Service Manual

COOLING SYSTEM
9. Hold the new gasket in place and install the
coolant pump and tighten the four bolts. Tighten
mounting bolts to 23 N·m (203 in.-lb)
10. Install and tighten the coolant pump cover and
bolts using a new gasket seal. Tighten
mounting bolts to 9.5 N·m (84 in.-lb)
11. Connect the coolant hoses to the coolant pump
cover.
12. Install the seawater pump belt and the
alternator belt. See Remove and Install
Alternator on page 11-5 and Replace Seawater
Pump Belt on page 7-19.
13. Install the belt guard.
14. Fill engine block with coolant. See Drain and Fill
Closed Cooling System on page 7-10.
15. Start the engine and check for coolant leaks.
Check the level of the coolant and fill as
necessary.
7-16

Remove and Install Thermostat

Removal
1. Allow the engine to cool and drain the coolant
from the engine block. See Drain and Fill
Closed Cooling System on page 7-10.
WARNING! Coolant Hazard. ALWAYS wear
eye protection and rubber gloves when you
handle Long Life engine coolant. If contact
with the eyes or skin should occur, flush
eyes and wash immediately with clean
water.
2. Remove air pipe and coolant hoses as
necessary to allow access to the thermostat
housing assembly (Figure 7-20, (1)).
Figure 7-20
3. Remove coolant hose (Figure 7-21, (1))
connecting thermostat housing to heat
exchanger.
4. Remove coolant hose (Figure 7-21, (2))
connecting thermostat housing to the coolant
pump. To release the clips on the coolant hose
see, Disconnect and Connect Quick-Connect
Fittings on page 7-11.
© 2009 Yanmar Marine International
( 1 )
Figure 7-20
BY Service Manual
Repair
0006649