Engine Coolant; Engine Coolant Specifications; Coolant (Closed Cooling System); Checking The Coolant Level - Yanmar 6SY Series Operation Manual

BEFORE YOU OPERATE

ENGINE COOLANT

Engine Coolant Specifications

Use a Long Life Coolant (LLC) that meets or
exceeds the following guidelines and
specifications: 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. NEVER mix
different types of engine coolants. This may
adversely affect the properties of the engine
coolant.
• BASF G48 or D542, Glycol - 30% or
higher
• ASTM D6210, D4985 (US)
• JIS K-2234 (Japan)
• SAE J814C, J1941, J1034 or J2036
(International)
Note: In the U.S., LLC is required for the
warranty to be valid.

Coolant (Closed Cooling System)

NOTICE: Always add LLC to soft water -
especially when operating in cold weather.
Without LLC, cooling performance will
decrease due to scale and rust in the cooling
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
also decrease the cooling efficiency. Do not
mix different types or brands of LLC or a
harmful sludge may form.Do not use hard
water. Water should be clean and free from
sludge or particles.
22
Following the manufacturer's
recommendations, use a proper LLC which
will not have any adverse effects on the
materials (cast iron, aluminum, copper, etc.)
of the engine's fresh water cooling system.
See Engine Coolant Specifications on page
22.
Replace engine coolant periodically,
according to the maintenance schedule in
this Operation Manual.
Remove scale from the cooling system
periodically by flushing the system.

Checking the Coolant Level

1. Open the coolant recovery tank filler
cap and check the coolant level.
WARNING! NEVER remove the
coolant filler cap if the engine is hot.
Steam and hot engine coolant will
escape and seriously burn you.
Allow the engine to cool sufficiently
before attempting to remove the
filler cap.
WARNING! 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. The correct level for a cold engine is
approximately 50 mm (2 in.) below the
full line.
3. Add coolant as necessary. Do not add
water. See Engine Coolant on page
22. WARNING! Securely tighten the
filler cap after checking the coolant
level. Steam can escape during
engine operation if the cap is loose.
6SY Operation Manual