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 aluminum casting with forged aluminum main
f. The engine crankcase is vented by an en-
bearing caps. The bearing caps function as an
closed crankcase breather system which is vented
i n t e g r a l part of the crankcase. Each cap is
through the crankcase breather tube (fig. 1-7) at
secured on studs with four slotted nuts. Two
the left turbosupercharger exhaust pipe.
through bolts clamp the main bearing cap in the
g. The engine primary and secondary fuel
tunnel slot of the crankcase. With this type of
filters (fig. 1-3) have individual drain lines, with
crankcase and bearing cap construction, uniform
drain cocks, which provide a means of draining
load distribution in the bearing area is obtained
the filters to remove water which may be ac-
making possible uniform distribution of com-
cumulated and to purge the fuel system. Late
bustion forces over the entire crankcase.
production AVDS-1790-2A engines have a
filter / water separator type secondary filter and
1-11. Main Bearings
drain lines to remove entrained moisture from
The seven replaceable main bearings are the
the fuel (fig. 1-6).
steel-backed, split type, having copper-lead alloy
1-9. Accessories
bearing surfaces. The center main bearing is
double-flanged with bearing material to control
Refer to paragraph 1-2 for information on
crankshaft end play and thrust.
engine accessories.
Y - Pressure oil pump drive impeller
Figure 1-8. Legend
Z - Piston cooling oil pump drive impeller
AA - Oil pump drive gear
BB - Starter idler gear
A - Intake valve rocker arm assembly
B - Exhaust valve rocker arm assembly
CC - Starter driven gearshaft
DD - Starter drive gear
C - Left camshaft assembly
EE - Front fan drive shaft
D - Camshaft driven gear
FF - Fan drive bevel gearshaft
E - Camshaft drive gearshaft
F - Camshaft drive shaft
GG - Rear fan drive shaft
HH - Fan driven gearshaft
G - Camshaft drive bevel gearshaft
JJ - Fuel injector pump drive gear shaft
H - Accessory drive gearshaft assembly
KK - Fuel injector pump driven shaft gear
J - Fuel injector pump advance assembly
LL - Fan drive clutch assembly
K - Right camshaft assembly
MM - Cooling fan adapter
L - Transmission accessory drive gearshaft
M - Accessory drive gear
NN - Rear cooling fan assembly
PP - Fan drive bevel gearshaft
N - Flywheel
QQ - Crankshaft assembly
P - Generator drive gearshaft
RR - Fuel pump drive coupling
Q - Generator idler gear
SS - Fuel pump drive adapter
R - Oil pump driven gear
TT - Crankshaft torsional vibration damper
S - Piston cooling oil pump driven impeller
UU - Connecting rod assembly
T - Pressure oil pump driven impeller
VV - Piston
U - Scavenge oil pump driven impeller
WW - Front cooling fan assembly
V - Oil pump driven shaft
X X - Exhaust valve
W - Scavenge oil pump drive impeller
YY - Intake valve
X - Scavenge oil pump driven impeller shaft
1-4
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