TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 74 of 1563
TM 9-2815-220-24
THEORY OF OPERATION
0004 00
ENGINE COMPONENTS (Continued)
Cooling Fans and Drive (Continued):
The fan clutch is cooled with engine oil.
The fan clutch drive and driven disks are loaded by
the centrifugal action of clutch balls and springs housed in the clutch assembly.
The balls and
springs are in the driven member and apply upward force to the clutch disks.
The clutch oil
enters the fan drive vertical shaft from the fan drive housing through an annular groove in the
shaft.
The oil flows through a central hole in the shaft to a distributor where it is dispersed to
the ball bearings and to the clutch disks.
The oil moves between the clutch disks by
centrifugal action and drains back through the fan drive housing into the engine oil pan.
WP 0004 00-12
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