Illustration 3 Left side view

TM 9-2320-312-24-2

Systems Operation Section

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Illustration 3

Left side view

(11) Oil filler

(14) Fuel priming pump (if equipped)

(12) Lifting eye

(15) Oil level gauge (typical example)

(18) Cylinder head grounding stud

(13) Fuel filter

(16) Engine Control Module (ECM)

(19) Oil drain plug

The hydraulic electronic unit injector system (HEUI)

The 3126B and 3126E engines are in-line six

eliminates many of the mechanical components

cylinder arrangements. The firing order of the

that are used in a pump-and-line system. The

engine is 1-5-3-6-2-4. The engine's rotation is

HEUI also provides increased control of the timing

counterclockwise when the engine is viewed from

and increased control of the fuel air mixture. The

the flywheel end of the engine. The engine utilizes

timing advance is achieved by precise control of

a turbocharger and an air-to-air aftercooler. The

the unit injector timing. Engine rpm is controlled by

engines have a bore of 110 mm (4.3 inch) and a

adjusting the injection duration. A special pulse

stroke of 127 mm (5.0 inch). The displacement is

7.25 L (442 in 3 ).

wheel provides information to the Engine Control

Module (ECM) for detection of cylinder position and

engine rpm.