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C O O L I N G S Y S T E M
Cooling System Flow: Front Cover
• Coolant is drawn into the inlet of the front
cover and then flows from the water pump
through the front cover to the crankcase.
• Coolant is also routed from the front cover
into the crankcase to a passage that feeds
the oil cooler.
• Return coolant is directed to the thermostat
by the front cover. If the thermostat is open,
coolant flows to the radiator to be cooled. If
the thermostat is closed, coolant is returned
to the water pump via a bypass circuit in the
front cover.
Cooling System Flow: Back of Front
Cover
• Coolant is sealed via a silicon in metal one
piece gasket and is directed out of the front
cover through three (3) passages.
• Two of the passages route coolant to the
crankcase to cool the cylinder walls and
cylinder heads.
• The third passage routes coolant to the oil
cooler via a passage in the crankcase.
• There are two passages for coolant to return
from the crankcase into the front cover.
Cooling System Flow: Oil Cooler
• Coolant is directed out of the crankcase and
into the oil filter base at the front of the
engine.
• The oil filter base routes the coolant into the
front of the oil cooler then toward the back of
the engine.
• Once the coolant has passed through the oil
cooler it is directed out of the oil filter base
to the EGR cooler.
• Note: There are weep holes in the oil filter
base that allow coolant or oil to seep out
side of the filter base if an oil cooler seal
is damaged.
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