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 TM 55-1925-273-10-1
0017 00
5
7
From Engine
Oil Pan
4
6
1
From Lube
Oil Cooler
To Lube
Oil Filter
2
3
Figure 4. Main Engine Lubrication System
MAIN LUBRICATION OIL SYSTEM
The main lubricating oil system supplies oil under pressure to most of the moving parts of the engine. The main lube oil and
piston cooling oil pump (figure 4, item 1) take oil from the strainer housing (figure 4, item 3) at the right front of the engine.
Oil from the main lube oil and piston cooling oil pump goes into the main oil manifold (figure 4, items 4), which is located
above the crankshaft and extends the length of the engine.
Oil tubes at the center of each main bearing "A" frame conduct oil from the main manifold (figure 4, item 4) to the upper half
of the crankshaft bearings. Drilled passages in the crankshaft supply oil to the connecting rod bearings, damper, and acces-
sory drive gear at the front of the crankshaft. Runoff oil from the adjacent main bearings lubricates the crankshaft thrust
bearings.
Oil from the main lube oil manifold (figure 4, item 4) enters the gear train at the idler gear stubshaft bracket located at the
rear of the engine. Oil passages in the stubshaft bracket distribute the oil. One passage conducts oil to both the right and left
bank camshaft drive, gear stubshaft brackets, and to a manifold connected to the turbocharger oil filter (figure 4, item 5).
After passing through the turbocharger oil filter, the oil enters the return line in the manifold and flows back to the idler gear
stubshaft. A passage in the idler gear stubshaft bracket directs lube oil to the upper and lower stubshaft bearings. Filtered oil
enters the turbocharger oil system from the upper idler gear stubshaft.
0017 00-5
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