Base Engine Operation
03
120
5
RG,RG34710,1519 –19–16SEP02–2/3
A—Oil Pump H—Oil Cooler Relief Valve N—Idler Gear Bushing S—Valve Rocker Arm Rollers
B—Oil Cooler I—Main Oil Galley O—Oil Pump Drive Gear T—Electronic Unit Injector
C—Oil Filter J—Piston Spray Jets Bushing Lube U—Turbocharger Lube Line
D—Oil Filter Bypass Valve K—Crankshaft Main Bearing P—Rocker Arm Shaft Oil V—Return Oil
E—Oil Cooler Bypass Valve L—Connecting Rod Bearing Supply W—Pressurized-Nonfiltered Oil
F—Oil Pressure Regulating M—Rocker Arm Shaft Q—Unit Injector Rocker Arm X—Pressurized-Filtered Oil
Valve Assemblies R—Unit Injector Rocker Arm
G—Pick-up Tube Roller Bushing
The lubrication system consists of a crankshaft driven
oil pump (A), oil cooler (B), oil filter (C), oil filter bypass
valve (D), oil cooler bypass valve (E), and oil pressure
regulating valve (F).
Oil is drawn from the sump via a pick-up tube (G) and
an internal passage in the cylinder block. The oil pump
sends the oil to the pressure regulating valve housing
and then to the oil cooler through an internal passage
in the cylinder block. An oil cooler relief valve (H)
protects the oil cooler during cold oil starting by
returning oil to sump. The cooler bypass valve allows
oil to bypass the cooler and flow to the filter if the oil
cooler is restricted. From the oil cooler oil flows to the
oil filter housing and into the filter. If the filter becomes
restricted, the oil filter bypass valve will open sending
oil to the main oil galley.
Oil flow from the filter is sensed by the oil pressure
regulating valve. This valve regulates the pressure in
the main oil galley (I). Excess oil is returned to sump.
Clean cool oil is routed directly from the top of the filter
base (U) to the turbocharger. Turbocharger return oil is
routed through a steel line to the cylinder block and
then to sump.
The remaining oil is routed to the main oil galley then
distributed to the piston spray jets (J), crankshaft main
bearings (K), connecting rod bearings (L), the two
rocker arm shaft assemblies (M), upper idler gear
bushing (N), and auxiliary drive.
The piston spray jets receive oil directly from the main
oil galley. These spray jets allow for precise targeting
of the oil spray onto the bottom of the piston.
Drilled passage in the block route oil directly to each
crankshaft main journal. The main bearing is slotted to
allow oil to flow to the crankshaft cross-drilled
passages. The crankshaft cross drilled passages route
oil flow from a main journal to each connecting rod
bearing.
A drilled passage (O) at the front of the block routes
lubrication oil to the oil pump. A cross drilled passage
in the pump housing routes this oil to the outside edge
of the pump. This oil lubricates the oil pump gear
bushing.
A drilled passage from the number one main bearing
routes oil to the upper idler gear hub. A drilled
passage in the hub routes oil to the outside edge of
the hub. This oil lubricates the upper idler gear
bushing.
A drilled passage in the cylinder block connects with
the upper idler passage. This oil is available to
lubricate auxiliary drive components.
Two drilled passages route oil from the main oil galley
through the cylinder block towards the head. At the
head gasket, oil flows into head bolt holes 19 and 23.
Oil flows around these bolts and into a cross-drilled
passage at the top of the head. Steel lines (P) connect
with the cross drilled passages and routes oil to a
rocker arm shaft hold down clamp for each rocker arm
shaft.
At the rocker arm hold down clamp, oil flows around a
cap screw and enters the rocker arm shaft assemblies
(M). The rocker arm shaft is hollow and is sealed on
each end. A hollow roll pin connects with each rocker
arm shaft drilled passage and routes oil to the two
center camshaft bushings.
CTM100 (06APR04)
03-120-5
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=337
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