DETROIT DIESEL 53
3.3
AIR SHUT-DOWN HOUSING
Fig. 1 - Typical In - Line Air Shut Down Housing Details and Relative Location Of Parts
The air shut-down. housing on the in-line engine is mounted on the' side of the blower.
The air shut-down housing contains an air shut-off valve that shuts off the air supply and stops the engine whenever
abnormal operating conditions require an emergency shut-down.
Remove Air Shut-Down Housing
1. Disconnect and remove the air ducts between the air cleaner and the air shut-down housing.
2. Disconnect the control wire from the air shut-off cam pin handle.
3. Remove the bolts and washers that retain the housing to the blower and remove the housing from the blower.
Remove the air shut-down housing gasket from the blower.
NOTE: Cover the blower opening to prevent dirt or foreign material from entering the blower.
Disassemble Air Shut-Down Housing
Refer to Fig. 1 and disassemble the air shut-down housing as follows:
1. Remove the pin from the end of the shut-down shaft. Then remove the washer from the shaft and the seal ring from
the housing.
2. Remove the two pins that secure the shut-off valve to the shaft.
3. Remove the bolt, lock washer and plain washer which attach the latch to the housing. Then remove the latch, latch
spring and spacer.
4. Note the position of the air shut-off valve spring and the valve (Fig. 2); then withdraw the shaft from the housing to
release the valve and the spring. Remove the valve and spring and the seal ring from the housing.
5. Remove the cam pin handle and withdraw the cam from the shaft.
Inspection
Clean all of the parts thoroughly, including the blower screen, with fuel oil and dry them with compressed air. Inspect the
parts for wear or damage. The face of the shut-down valve must be perfectly flat to assure a tight seal when it is in the
shut-down position.
October, 1970 SEC.
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