TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 57 of 779
b. Fan Drive and Clutch (figs. 1-13 and 1-14).
The fan clutch is oil cooled. 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. Early cooling fan clutch-
es had a hydraulic disengagement feature, The
clutch actuating piston
(fig. 1-13) for this
hydraulic disengagement feature was eliminated
on late engines, and the clutch has been greatly
simplified and improved (fig. 1-14).
Figure 1-14. Mechanical cooling fan clutch—sectional view.
1-19
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