Electrical System - Perkins 1104E Systems Operation Testing And Adjusting

12
Systems Operation Section
Lubricating oil from the oil gallery flows through
high pressure passages to the main bearings of
the crankshaft (5). Then, the oil flows through the
passages in the crankshaft to the connecting rod
bearing journals (6). The pistons and the cylinder
bores are lubricated by the splash of oil and the oil
mist.
Lubricating oil from the main bearings flows through
passages in the cylinder block to the journals of the
camshaft. Then, the oil flows from the front journal
of the camshaft (2) at a reduced pressure to the
cylinder head. The oil then flows through the center
of the rocker shaft (1) to the rocker arm levers. The
valve stems, the valve springs and the valve lifters
are lubricated by the splash and the oil mist.
The hub of the idler gear is lubricated by oil from the
oil gallery. The timing gears are lubricated by the
splash from the oil.
An external line from the cylinder block supplies oil to
the turbocharger. The oil then flows through a return
line to the oil pan.
Engines have piston cooling jets that are supplied
with oil from the oil gallery. The piston cooling jets
spray lubricating oil on the underside of the pistons in
order to cool the pistons.

Electrical System

The electrical system is a negative ground system.
The charging circuit operates when the engine
is running. The alternator in the charging circuit
produces direct current for the electrical system.
Alternator
Illustration 8
(1) Shaft for mounting the pulley
The alternator produces the following electrical
output:
• Three-phase
•
Full-wave
i02242636
•
Rectified
The alternator is an electro-mechanical component.
The alternator is driven by a drive belt from the
crankshaft pulley. The alternator charges the storage
battery during the engine operation.
The alternator converts the mechanical energy
and the magnetic energy into electrical energy.
This conversion is done by rotating a direct current
electromagnetic field on the inside of a three-phase
stator. The electromagnetic field is generated by
electrical current flowing through a rotor. The stator
generates AC electrical power.
The alternating current is changed to direct current
by a three-phase, full-wave rectifier. Direct current
flows to the output terminal of the alternator. The
rectifier has three exciter diodes. The direct current
is used for the charging process.
A regulator is installed on the rear end of the
alternator. Two brushes conduct current through two
slip rings. The current then flows to the rotor field. A
capacitor protects the rectifier from high voltages.
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