Yanmar 4BY, Service Manual, Page: 177 / 275

COOLING SYSTEM
7-18
BY Service Manual
Repair
Figure 7-17
5. Remove four bolts (Figure 7-17, (1)) and
remove coolant pump (Figure 7-17, (2)) .
Figure 7-18
IMPORTANT
Use caution not to damage the sealing
surface of the cylinder block when cutting
old gasket.
6. Cut old gasket (Figure 7-18, (2)) at locations
(Figure 7-18, (1)) using a sharp chisel
(Figure 7-18, (3)) .
7. Remove the old gasket and clean any material
off engine block.
Figure 7-19
8. Cut tabs (Figure 7-19, (1)) of new gasket at
locations shown. Check gasket fit on engine
before proceeding.
9. Hold new gasket in place and install coolant
pump.
10. Install thermostat assembly. See Remove and
Install Thermostat on page 7-19.
11. Fill engine block with coolant. See Draining and
Filling Closed Cooling System on page 7-12.
12. Start the engine and check for coolant leaks.
Check the level of the coolant and fill as
necessary.
000 3 696
(1)