Perkins 1104D NH1 Systems Operation Testing And Adjusting page 5

RENR7967
Illustration 2
Rear right engine view
(14) Turbocharger
(15) Alternator
(16) Exhaust manifold
(17) Wastegate solenoid
Note: The primary fuel filter is mounted off the
engine.
The 1104D models NH1 and NJ1 diesel engines are
electronically controlled. The 1104D engine uses
an Electronic Control Module (ECM) that receives
signals from the fuel injection pump and other
sensors in order to control the fuel injectors. The
pump supplies fuel to the fuel injectors.
The four cylinders are arranged in-line. The cylinder
head assembly has two inlet valves and two exhaust
valves for each cylinder. The ports for the exhaust
valves are on the right side of the cylinder head. The
ports for the inlet valves are on the left side of the
cylinder head. Each cylinder valve has a single valve
spring.
(18) Starting motor
(19) Oil pan
(20) Drain plug
(21) Primary fuel filter
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 in order
to cool the piston. The pistons have a Quiescent
combustion chamber in the top of the piston in order
to achieve clean exhaust emissions. The piston pin is
off-center in order 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 in order to reduce wear of the groove.
The skirt has a coating of graphite in order to reduce
wear when the engine is new. The correct piston
height is important in order 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 in order to conform to
requirements for emissions.
Systems Operation Section
(22) Hand fuel priming pump
(23) Flywheel housing
(24) Heat shield
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