User Manual

Illustration 3 g06082892
Typical example of an engine with top mounted aftertreatment
The 854E-E34TA, 854F-E34T, and 854F-E34TA
diesel engines are electronically controlled. The
854E-E34TA, 854F-E34T, and 854F-E34TA engines
have an Electronic Control Module (ECM) that
receives signals from the fuel injection pump and
other sensors to control the electronic unit injector.
The fuel injection pump supplies fuel to the fuel
manifold (Rail). The fuel manifold (Rail) distributes
fuel to the electronic unit injectors.
The four cylinders are arranged in-line. The cylinder
head assembly has one inlet valve and one exhaust
valve for each cylinder. The port for the exhaust valve
is on the right side of the cylinder head. The port for
the inlet valve is on the top of the cylinder head. Each
cylinder valve has a single valve spring.
Each cylinder has a piston cooling jet that is installed
in the cylinder block. The piston cooling jet sprays
engine oil onto the inner surface of the piston to cool
the piston. The pistons have a Quiescent combustion
chamber in the top of the piston to achieve clean
exhaust emissions. The piston pin is off-center to
reduce the noise level.
The pistons have two compression rings and an oil
control ring. The groove for the top ring has a hard
metal insert to reduce wear of the groove. The skirt
has a layer of graphite to reduce the risk of seizure
when the engine is new. The correct piston height is
important to ensure that the piston does not contact
the cylinder head. The correct piston height also
ensures the efficient combustion of fuel which is
necessary to conform to requirements for emissions.
The crankshaft has five main bearing journals. End
play is controlled by thrust washers which are on both
sides of the number 3 main bearing.
The timing case is made of cast iron. Some of the
timing gears are stamped with timing marks to
ensure the correct assembly of the gears. When the
number 1 piston is at a certain position, the marked
teeth on the camshaft gear will align with the marks
that are on the gear on the crankshaft.
There are no timing marks on the rear face of the
timing case.
The crankshaft gear turns the camshaft gear which
then turns the following gears:
• the idler gear
• the idler gear for the engine oil pump
• the engine oil pump gear
UENR0623-02
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General Information
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