j. The Governor.
A speed limiting, mechanical governor mounts
between the engine blower and flywheel housing.
The governor holds
the fuel injector racks in the advanced fuel position for starting
when the speed control lever is in the idle position.
Immediately
after starting, the governor moves the injector racks to the position
for idling and controls the speed of engine during operation.
2.
Description of the Major Components of the 6V53T Engine (Model
#5393).
A description of components also entails discussing operational
characteristics of these components. Therefore, we will discuss the
operation
of
the
specific
components
alongside
the
detailed
description of the components themselves.
a. The Cylinder Block (Fig. 5).
A one-piece cast iron casting
cylinder block is the main strength and structural component of the
engine.
Boring of the block allows for the use of replaceable
cylinder liners and camshaft bearings.
The block has drilled
passages that carry lubricating oil to all moving parts. It also has
air box openings in both sides that permit access to the air box for
internal inspection of the engine, through the air inlet ports.
During machining, it is grooved on the top surfaces of the cylinder
banks to accommodate a block-to-head seal ring. Additionally, it has
grooves around the air inlet openings, between the cylinder banks, to
accommodate a blower-to-seal ring.
Counterboring of the water and
oil passages provides a space for the individual seal rings
necessary.
Two end and two intermediate, pressed fit, bushing-type
bearings support the two camshafts.
Pressurized oil enters the end
bearing from oil passages in the cylinder block for lubrication.
From the end bearing, oil passes through the hollow camshafts to the
intermediate bearings.
The 6V53T (model #5393) has four upper main bearings.
Each bearing
has six 1/4 inch holes and one 7/16 inch hole. The 7/16 inch hole in
each upper bearing shell aligns with the vertical oil passage in the
cylinder block. Pressurized lubricating oil from the cylinder block
passes through the bearing shell to the drilled passages in the
crankshaft and then goes to the connecting rods.
Compared to
previous bearings with one hole, this bearing improves piston cooling
by allowing more oil, under pressure, to flow to the drilled passages
in the crankshaft.
The lower main bearing shells have no oil
grooves; therefore, the upper and lower bearing shells are not
interchangeable.
The lower bearing shells have off-center tangs.
The upper bearing shells have centered tangs to aid in the correct
installation of the main bearing shells.
8
OD1713
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