Yanmar BY Series Service Manual page 60

PERIODIC MAINTENANCE
6. Install cylinder block drain plug with a new
gasket.
7. Install heat exchanger. Ensure the drain cock
(Figure 4-12, (1)) on the heat exchanger is
closed.
Figure 4-12
(1)
Figure 4-12
8. Remove the pressure cap (Figure 4-12, (2))
from the heat exchanger.
9. Inspect the cap gasket and flange on the filler
neck for damage. Replace if necessary.
10. Check the rubber hose connecting the coolant
recovery tank to the heat exchanger. Be sure
the hose is securely connected and there is no
damage.
11. Pour coolant mix slowly into the heat exchanger
to prevent the formation of air pockets. Fill until
the heat exchanger is completely full. NOTICE:
Only use the engine coolant specified. Other
engine coolants may affect warranty coverage,
cause an internal buildup of rust and scale
and / or shorten engine life. Prevent dirt and
debris from contaminating engine coolant.
Carefully clean the filler cap and the
surrounding area before you remove the cap.
NEVER mix different types of engine coolants.
This may adversely affect the properties of the
engine coolant.
4-16
(2)
0006644
© 2009 Yanmar Marine International
Periodic Maintenance Procedures
12. Install the pressure cap and tighten firmly.
WARNING! Burn Hazard. ALWAYS tighten
the filler cap securely after checking the
coolant level. Steam can escape during
engine operation if the cap is loose.
13. Remove the coolant recovery tank cap and fill
with coolant mix to approximately 50 mm (2 in.)
below the full line. Replace cap. Never fill to the
full line.
14. After filling an empty cooling system, test-run
the engine for about five minutes and check the
engine coolant level at the recovery tank again.
BY Service Manual