14.14 Governing Device Adjustment
DETROIT DIESEL 53
THROTTLE DELAY MECHANISM
The throttle delay mechanism is used to retard full fuel
injection when the engine is accelerated. This reduces
exhaust smoke and also helps to improve fuel economy.
The throttle delay mechanism (Fig. 1) is installed or
between the No. 1 and No. 2 cylinders on the right-
bank cylinder head of V-type engines. It consists of a
special rocker arm shaft bracket (which incorporates the
throttle delay cylinder), a piston, throttle delay lever,
connecting link, oil supply plug, ball check valve and U-
bolt.
A
yield lever replaces the standard operating lever in the
governor of the 6V-53 engine (Fig. 2)
check valve. Further movement of the piston uncovers
an opening which permits oil from the reservoir to enter
the cylinder and displace the air. When the engine is
Operation
accelerated, movement of the injector racks toward the
full-fuel position is momentarily retarded while the piston
Oil is supplied to a reservoir above the throttle delay
expels the oil from the cylinder through a .016 " orifice.
cylinder through a special plug in the drilled oil passage
To permit full accelerator travel, regardless of the
in the rocker arm shaft bracket (Fig.1). As the injector
retarded injector rack position, a spring loaded yield
racks are moved toward the no-fuel position, free
lever or link assembly replaces
movement of the throttle delay piston is assured by air
drawn into the cylinder through the ball
Fig. 2 - Throttle Delay Yield Lever (6V Engine)
Fig.1. Throttle Delay Cylinder
1972 General Motors Corp.
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