3.3 Air Shut-down Housing
DETROIT DIESEL 53
Assemble Air Shut-Down Assembly
The holes for the cam pin handle and the retaining pins must be drilled,
using a 1/8" diameter drill, at the time a new service shaft or air shut-off
valve(s) is assembled. The valve(s) must be in the same plane within
.03" when in the stop position (flush with the housing face). Refer to
Figs. I and 2 and proceed as follows:
1. Place the valve(s) and spring in position in the housing (Fig. 2) and
slip the shaft in place. The shaft must extend .70" from the side of
the housing where the shut-down latch is assembled.
Fig. 2 · Installing Air Shut-Off Valve Spring
2. Install a new seal ring at each end of the shaft. Be sure the seals
are seated in the counterbores of the housing.
Install the cam and cam pin handle on the shaft.
4. Install a washer and retaining pin at the other end of the shaft.
5. Assemble the spacer (bushing), spring and latch to the shut-down
housing with the 1/4"-20 bolt, lock washer and plain washer.
a. Align the notch on the bushing with the notch on the latch and
lock the bushing in this position.
b. Install the pins in the valve(s) to retain it to the shaft with the
cam release latch set and the valve(s) in the run position.
Fig. 3 - Location of Air Shut-Down Housing
Mounting Bolts (In-Line Engines)
c. Level the valve(s) in the shut-down position.
d. Adjust the bushing so the valve(s) contacts the housing when the cam release latch is set.
Install Air Shut-Down Housing (In-Line Engines)
1. Place the blower screen and gasket assembly in position with the screen side of the assembly toward the blower.
2. Refer to Figs. 1 and 3 and secure the air shut-down housing to the blower with bolts, washers and lock washers as