Dodge RAM TRUCK 1500 1995 Service Manual page 1024

S.IL (DIESEL) ENGINE 1-181
INSTALLATION
(1) Clean the sealing surface.
(2) Install the suction tube and gasket. Tighten the
bolts to 24 N-m (18 ft. lbs.) torque.
(8) Fill the joint between the pan rail/gear housing
and pan rail/rear cover with sealant. Use Three Bond
1207-C, or equivalent.
(4) Install the pan and gasket (Fig. 1). Tighten the
bolts to 24 N-m (18 ft. lbs.) torque.
(5) Install the drain plug with a new sealing
washer and tighten to 80 N-m (60 ft. lbs.) torque.
(6) Install the engine assembly into the vehicle.
(7) Fill the engine with clean lubrication oil (refer
to Group 0, Lubrication and Maintenance). Eun the
engine and check for leaks.
(8) Stop the engine and let it set for five minutes.
Check the oil level, and add oil if needed.
[ L U B R I C A T I O N S Y S T E M
The engine uses a gerotor type lubricating pump.
The machined cavity in the block is the same for all
engines. The pressure regulating valve is designed to
keep the lubricating oil pressure from exceeding
449kPa (65 PSI). When the lubricating oil pressure
from the pump is greater the 499kPa (65 PSI), The
valve opens uncovering the dump port so part of the
lubricating oil is routed to the oil pan. Because of
manufacturing tolerances of the components and the
oil passages, the lubricating oil pressure can differ as
much as 69 kPa (10 PSI) between engines.
The engines use full flow, plate type oil coolers. The
oil flows through a cast passage in the cooler cover
and through the element where it is cooled by the en­
gine coolant flowing past the plates of the elements.
After the oil is cooled, it flows through the full flow
oil filter.
The lubricating oil cooler cover contains a bypass
valve the will let the lubricating oil flow bypass a
plugged filter. The valve is designed to open when
the pressure drop across the filter is more than 138
kPa (20 PSI), as with a plugged filter and lets the lu­
bricating oil continue on through the engine. When a
filter becomes plugged, an oil pressure decrease of 60
kPa (10 PSI) or less from normal operating pressure
can be observed on the vehicle lubricating oil pres­
sure gauge. This allows unfiltered oil into the engine.
This condition should be avoided by changing the fil­
ter at each oil change.
The turbocharger receives filtered, cooled and pres­
surized lubricating oil through a supply line from the
filter head. A drain line connected to the bottom of
the turbocharger housing returns the lubricating oil
to the lubricating oil pan through a fitting in the cyl­
inder block.
The main bearings and the valve train are lubri­
cated by pressurized oil directly from the main oil
gallery, the other power components, connecting rods,
pistons, and camshaft receive pressurized oil directly
from the main oil gallery. Passages in the crankshaft
supply oil to the connecting rods bearings. The oil is
supplied to the camshaft journals through passages
in the main bearings saddles. Smaller passages in
the main bearings saddles supply oil to the pistons
cooling nozzles. The spray from the nozzles also pro­
vides lubrication for the piston pins.
Lubrication for the valve train is supplied through
separate passages in the cylinder block. Oil flows
through the passages and across the oil transfer slot
in the cylinder head gasket. From the transfer slot,
the oil flows around the outside diameter at the cyl­
inder capscrew, across a slot in the bottom of the
rocker lever support, and up the vertical passage in
the support. From these passages, oil flows through
passages in the rocker lever shaft to lubricate the
rocker levers. The oil from the channel lubricates the
valves stems, push rods, and tappets.