Main oil gallery (1) is connected to the main
turbocharger drain lines (21 and 22) are connected to the
bearings by drilled holes. Drilled holes in the crankshaft
flywheel housing on each side of the engine.
connect the main bearing oil supply to the rod bearings.
Oil is sent to the front and rear gear groups
Oil from the rear of the main oil gallery goes to the rear of
through drilled passages in the front and rear housings
right camshaft gallery (5).
and cylinder block faces.
These passages are
Sequence valves (7 and 8) let oil from main oil
connected to camshaft oil galleries (2 and 5).
gallery ( 1 ) go to piston cooling jet oil galleries (3 and 4).
After the oil for lubrication has done its work, it
The sequence valves open at 140 kPa (20 psi). The
goes back to the engine oil pan.
sequence valves will not let oil into the piston cooling jet
oil galleries until there is pressure in the main oil gallery.
This decreases the amount of time necessary for
pressure build-up when the engine is started. It also
helps hold pressure at idle speed.
PISTON COOLING AND LUBRICATION
RIGHT FRONT SIDE OF ENGINE
18. Cooling jet.
10. Oil filter bypass valve. 17. Oil filter housing. 19. Oil
line to filter housing.
There is a piston cooling jet (18) below each
piston. Each cooling jet has two openings. One opening
is directed at a passage in the bottom of the piston. This
passage takes oil to a manifold behind the ring band of
the piston. A slot (groove) is in the side of both piston pin
bores and connects them with the manifold behind the
ring band. The other opening is directed at the center of
This helps cool the piston and gives
lubrication to the piston pin.
LEFT FRONT OF ENGINE
9. Elbow. 10. Oil filter bypass valve. 17. Oil filter
housing. 20. Oil outlet line from oil filter housing. 23.
Filter oil supply from oil pump.
6. Oil supply lines. 21. Oil drain for left turbocharger.
22. Oil drain for right turbocharger.
Oil lines (6) send oil to the turbochargers. The