DETROIT DIESEL 53
1.1.2
AIR BOX DRAINS
During normal engine operation, water vapor from the
air charge, as well as a slight amount of fuel and
lubricating oil fumes, condense and settle on the bottom
of the air box. This condensation is removed by the air
box pressure through air box drain tubes mounted on
the sides of the cylinder block.
Two drain tubes are used on the 6V engines (Fig.1.) at
the rear end of the cylinder block.
Fig. 1. Air Box Drain Tube Mounting (6V
Engine)
Inspection
During engine operation, a periodic check is
recommended for air flow from the air box drain tubes.
A partially plugged air box drain tube may allow air to
escape and still cause liquid accumulation within the air
box. This liquid accumulation can be seen by removing
the cylinder block air box covers.
1971 General Motors Corp
April, 1971
SEC 1.1.2 Page 1
