Chrysler RAM TRUCK 2500 1994 Service Manual page 780

Clean oil screen and pipe thoroughly i n clean sol­
vent. Inspect condition of screen.
I N S P E C T I O N
Inspect oil drain plug and plug hole for stripped or
damaged threads. Repair as necessary.
Inspect oil pan mounting flange for bends or distor­
tion. Straighten flange, i f necessary.
INSTALLATION
(1) Fabricate 4 alignment dowels from 1 1/2 x 5/16
inch bolts. Cut the head off the bolts and cut a slot
into the top of the dowel. This will allow easier in­
stallation and removal with a screwdriver (Fig. 1).
1V
2
" x 5 / 1 6 " BOLT
A
i
DOWEL
SLOT
J9209-106
Fig. 1 Fabrication of Alignment Dowels
(2) Install the dowels i n the cylinder block (Fig. 2).
(3) Apply small amount of Mopar Silicone Rubber
Adhesive Sealant, or equivalent i n the corner of the
cap and the cylinder block.
(4) Slide the one-piece gasket over the dowels and
onto the block.
DOWEL
DOWEL
DOWEL \ \ © / / D O W E L / / J9309-79
Fig. 2 Position of Dowels in Cylinder Block
(5) Position the oil pan over the dowels and onto
the gasket.
(6) Install the oil pan bolts. Tighten the bolts to 24
N-m (215 i n . lbs.) torque.
(7) Remove the dowels. Install the remaining oil
pan bolts. Tighten these bolts to 24 N-m (215 in. lbs.)
torque.
(8) Lower the engine into the support cushion
brackets and tighten the thru bolt nut to the proper
torque.
(9) Install the drain plug. Tighten drain plug to 34
N-m (25 ft. lbs.) torque.
(10) Install the engine to transmission strut.
(11) Install exhaust pipe.
(12) Lower vehicle.
(13) Install dipstick.
(14) Connect the negative cable to the battery.
(15) Fill crankcase with oil to proper level.
OIL P U M P
OIL PUMP PRESSURE
The M I N I M U M oil pump pressure is 41.4 kPa (6
psi) at curb idle. The MAXIMUM oil pump pressure
is 207-552 kPa (30-80 psi) at 3,000 RPM or more.
CAUTION: If oil pressure is Z E R O at curb idle, DO
NOT run engine at 3,000 RPM.
REMOVAL
(1) Remove the oil pan.
(2) Remove the oil pump from rear main bearing
cap.
INSTALLATION
(1) Install oil pump. During installation slowly ro­
tate pump body to ensure driveshaft-to-pump rotor
shaft engagement.
(2) Hold the oil pump base flush against mating
surface on No.5 main bearing cap. Finger tighten
pump attaching bolts. Tighten attaching bolts to 41
N-m (30 ft. lbs.) torque.
(3) Install the oil pan.
PISTON / CONNECTING R
O D A S S E M B
The pistons are elliptically turned so that the di­
ameter at the pin boss is less than its diameter
across the thrust face. This allows for expansion un­
der normal operating conditions. Under operating
temperatures, expansion forces the pin bosses away
from each other, causing the piston to assume a more
nearly round shape.
All pistons are machined to the same weight, re­
gardless of size, to maintain piston balance.
The piston pin rotates i n the piston only and is re­
tained by the press interference fit of the piston pin
in the connecting rod.