Base Engine Operation
03
120
10
RG,RG34710,1521 –19–09SEP02–3/3
The top thermostat is a non-blocking type. When it
opens, coolant will flow to the radiator. The
non-blocking type has a vent notch to provide an air
bleed when the cooling system is filled.
On water-to-air aftercooled engines, coolant is routed
through an external line (I) to the aftercooler, then
back to the oil cooler housing through a second
external line (J).
Coolant also flows in passages (O) around the unit
injector sleeves (P). This helps to regulate the
temperature of injected fuel.
OUO1004,0000C29 –19–09SEP02–1/1
Fuel System Theory of Operation
NOTE: Fuel system operation is now covered in the
following companion manuals:
•
CTM115—Lucas Electronic Fuel Systems With
Lucas EUIs
•
CTM188—Level 6 Electronic Fuel Systems With
Lucas EUIs
CTM115 covers earlier Tier I engines, while
CTM188 covers later Tier II engines (with either
dual-rail or single-rail fuel systems.)
CTM100 (06APR04)
03-120-10
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=342
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