Coolant (Closed Cooling System); Checking And Adding Coolant - Yanmar 6LPA-STP2 Operation Manual

BEFORE YOU OPERATE

Coolant (Closed Cooling System)

NOTICE
ALWAYS add LLC to soft water especially
when operating in cold weather. NEVER
use hard water. Water should be clean and
free from sludge or particles. Without LLC,
cooling performance will decrease due to
scale and rust in the coolant system. Water
alone may freeze and form ice; it expands
approximately 9% in volume. Use the
proper amount of coolant concentrate for
the ambient temperature as specified by
the LLC manufacturer. LLC concentration
should be a minimum of 30% to a
maximum of 60%. Too much LLC will
decrease the cooling efficiency. Excessive
use of antifreeze also lowers the cooling
efficiency of the engine. NEVER mix
different types or brands of LLC, as a
harmful sludge may form. Mixing different
brands of antifreeze may cause chemical
reactions, and may make the antifreeze
useless or cause engine problems.
34

Checking and Adding Coolant

Figure 7
( 1 )
Figure 8
1. Ensure all drain cocks are closed.
2. Loosen the filler cap of the coolant tank
to relieve the pressure, then remove the
filler cap (Figure 8, (1)) .
WARNING
Burn Hazard.
NEVER remove the coolant filler cap
if the engine is hot. Steam and hot
engine coolant will spray out and
seriously burn you. Allow the engine
to cool down before you attempt to
remove the cap.
3. Pour coolant slowly into the coolant
tank to avoid air bubbles. Fill until
coolant overflows from the filler port.
NOTICE
NEVER pour cold coolant into a hot
engine.
4. Align filler cap tabs with filler port
notches and tighten filler cap firmly.
6LPA Series Operation Manual
0004910