TM 5-3805-280-24-2
Engine System Operation and Tests
105
A--Oil Pump
K--Crankshaft Drilled
U--Turbocharger Drain
AD--Low-Mount Rear
7
B--Oil Suction Line
Cross-Passages
Line
Vertical Oil Filter
C--Oil Outlet Tube
L--Main Bearing Bushings
V--Rocker Arms
Assembly
D--Oil Cooler Housing
M--Oil Passages
W--Machined Groove
AE--Low-Mount Front
E--Coolant Passage
N--Main Oil Gallery
X--Cross-Drillings
Vertical Oil Filter
Adapter
O--Connecting Rod
Y--Oil Pressure Regulating
Assembly
F--Oil Filter
Bearings
Valve
AF--Remote Mount Filter
G--Oil Filter
P--Piston Cooling Orifice
Z--Oil ByPass Valve
Assembly
Header/Adapter
Q--Camshaft Bushings
AA--Pressurized Oil
H--Oil Fill Tube
R--Piston Pin and Bushing
AB--Pressure-Free Oil
I--Oil Cooler
S--Rocker Arm Shaft
AC--High-Mount Vertical
J--Balancer Shaft
T--Turbocharger Oil
Oil Filter Assembly
Bushings
Supply Line
Oil from the piston cooling orifices sprays on the
HOW THE ENGINE LUBRICATION SYSTEM WORKS
underside of the piston to keep the piston crown cool.
The oil spray also provides splash lubrication for the
The engine lubrication system consists of a positive
piston pin and bushing (R) by splashing oil into a hole
displacement gear-driven oil pump (A), full-flow oil filter
drilled in the top end of the connecting rod.
(F), oil cooler (I), oil pressure regulating valve (Y), and
an oil by-pass valve (Z).
At the rear of the cylinder block, oil flows from the rear
camshaft bore (Q), up through the cylinder head, and
The oil pump pulls oil from the oil pan sump through a
into the rocker arm shaft (S). Oil flows through the
strainer and a suction line (B). The pump forces oil
rocker arm shaft and lubricates each of the rocker
through the outlet tube (C) into a vertical drilling in the
arms (V). Oil drips from the rocker arms to lubricate
cylinder block, and up to the oil cooler and filter. After
the adjusting screws, push rods, and camshaft
flowing through the cooler and filter, oil flows into the
followers.
main oil gallery (N).
At the front of the cylinder block, oil flows from the oil
The main oil gallery runs the length of the cylinder
passage into a machined groove (W) in the front face
block and delivers oil to oil passages (M) that feed the
of the block. This groove connects with the upper idler
camshaft bushings (Q) and main bearing bushings (L).
gear shaft to provide oil to the idler gear bushing. The
The cross-drillings (X) intersect with those same oil
lower idler gear bushing is splash lubricated.
passages and feed oil to the balancer shaft bushings
(J).
The turbocharger oil supply line (T) supplies oil to the
turbocharger from filtered side of oil filter adapter. Oil
From the main bearings, oil flows to the connecting rod
returns from the turbocharger through the drain line
bearings (O) through drilled cross-passages (K) in the
(U).
crankshaft between the main journals and connecting
rod journals. Oil from the main bearing also supplies
oil to the piston cooling orifices (P).
DPSG,OUO1004,131
1915MAY982/2
13-484
