22
Lubrication SyStem
35
Lubrication System Oil Flow
• Oil is drawn from the oil pan through the pick-up tube. The
oil is then routed through a passage cast into the upper oil
pan before being routed through a passage in the block, a
passage in the front cover, and finally to the oil pump inlet.
• The regulator valve utilizes a force, provided via the regulator
spring, to apply a pressure equal to 65 psi. Whenever oil pressure
exceeds this force, the regulator valve will move downward
and allow the excess pressure to bleed off back through a
passage that routes the oil back to the inlet side of the pump.
• From the oil pump, oil is directed to the oil
cooler and then to the oil filter.
• From the oil filter the oil is supplied to a chamber incorporating
five (5) passages. One (1) is to the turbochargers for
lubrication. Two (2) are to the EOT and EOP sensors.
• The two (2) other passages are to the tappet oil
supply on the right and left banks. The tappet galleries
also provide oil to the piston cooling jets.
• Cross drillings off of the right bank tappet
gallery supply oil to the main bearings.
• Another cross drilling vertically up from each main
bearing supplies oil to the camshaft bearings.
Note: This oil supply routing is different than the 6.0L
and uses different bearings which are also placed
differently with respect to the oil holes.
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