Dodge RAM TRUCK 1500 1995 Service Manual page 979

Each bearing cap has a small V-groove across the
parting face. When installing the lower bearing shell,
make certain that the V-groove in the shell is in line
with the V-groove in the cap. This provides lubrica­
tion of the cylinder wall in the opposite bank.
The bearing shells must be installed so that the
tangs are in the machined grooves in the rods and
caps.
Limits of taper or out-of-round on any crankshaft
journals should be held to 0.025 mm (0.001 inch).
Bearings are available in 0.025 mm (0.001 inch),
0.051 mm (0.002 inch), 0.076 mm (0.003 inch), 0.254
mm (0.010 inch) and 0.305 mm (0.012 inch) under­
size. Install the bearings in pairs. DO NOT use a
new bearing half with an old bearing half. DO
NOT file the rods or bearing caps.
I N S T A L L A T I O N
(1) Be sure that compression ring gaps are stag­
gered so that neither is in line with oil ring rail gap.
(2) Before installing the ring compressor, make
sure the oil ring expander ends are butted and the
rail gaps located properly (Fig. 15).
(3) Immerse the piston head and rings in clean en­
gine oil. Slide Piston Ring Compressor Tool C-385
over the piston and tighten with the special wrench
(part of Tool C-385). Be sure position of rings
does not change during this operation.
(4) Install connecting rod bolt protectors on rod
bolts, a long protector should be installed on the
numbered side of the connecting rod.
(5) Rotate crankshaft so that the connecting rod
journal is on the center of the cylinder bore in the
bottom dead center position. Be sure connecting rod
and cylinder bore number are the same. Insert rod
and piston into cylinder bore. Be sure the piston and
rod assemblies are installed in the proper orientation
(Fig. 19).
(6) The notch, groove or arrow on top of piston
must be pointing toward front of engine. The larger
chamfer of the connecting rod bore must be installed
toward crankshaft journal fillet.
(7) While tapping the piston down in cylinder bore
with the handle of a hammer, guide the connecting
rod over the crankshaft journal.
(8) Install rod caps. Install nuts on cleaned and
oiled rod bolts and tighten nuts to 61 N-m (45 ft. lbs.)
torque.
(9) Install the oil pump pick-up tube and oil pan.
(10) Install the cylinder head, push rods, rocker
arms and valve cover.
(11) Install lower intake manifold.
(11) Install the engine into the vehicle.(refer to En­
gine Installation of this manual).
CRANKSHAFT
When a crankshaft is replaced, all main and con­
necting rod bearings should be replaced with new
FRONT I.P.
TOWARDS THIS SIDE
ORIENTATION BUTTON ORIENTATION BUTTON
TOWARDS FRONT TOWARDS REAR
(LH. ONLY) (R.H. ONLY)
1,3,5,7,9 2,4,6,8,10
J9409-78
Fig. 19 Piston and Rod Orientation
bearings. Therefore, selective fitting of the bearings
is not required when a crankshaft and bearings are
replaced.
REMOVAL
(1) Remove the oil pan.
(2) Remove the oil pickup tube.
(3) Remove the timing chain cover and gasket. Re­
move and discard the front crankshaft oil seal and
cover gasket.
(4) Remove Transmission (refer to Group 21,
Transmission).
(5) Remove the rear seal retainer. Remove and dis­
card the crankshaft rear oil seal and retainer gasket.
(6) Identify main bearing caps before removal (Fig.
20). Remove bearing caps and bearings one at a time.
(7) Remove the connecting rod bearing caps.
(8) Lift the crankshaft straight out of the block.
JOURNALS
The crankshaft connecting rod and main journals
should be checked for excessive wear, taper and scor­
ing. The maximum taper or out-of-round on any
crankshaft journal is 0.025 mm (0.001 inch).
Journal grinding should not exceed 0.305 mm
(0.012 inch) under the standard journal diameter. DO
NOT grind thrust faces of No.3 main bearing. DO