Dodge RAM TRUCK 1500 1995 Service Manual page 980

BR
Fig. 20 Main Bearing identification
NOT nick crank pin or bearing fillets. After grinding,
remove rough edges from crankshaft oil holes and
clean out all oil passages.
CAUTION: After any journal grind, it is important
that the final paper or cloth polish be in the same
direction as the engine rotates.
INSTALLATION
(1) Lubricate crankshaft main bearings with clean
engine oil.
(2) Install the crankshaft into the cylinder block.
(3) Lubricate the main journals with clean engine
oil. Install main bearing caps and bolts. Follow the 2
step tightening sequence.
• Step 1—Starting with bearing cap No.l, tighten
the bolts to 27 N-m (20 ft. lbs.) torque.
• Step 2—Starting with bearing cap No.l, tighten
the bolts to 115 N-m (85 ft. lbs.) torque.
(4) Lubricate the connecting rod bearings and jour­
nals with clean engine oil. Carefully install connect­
ing rods to the crankshaft.
(5) Install the rear seal retainer with a new gasket
and oil seal. Use seal installer 6687 when installing
the oil seal.
(6) Install the timing chain cover with a new gas­
ket and oil seal.
(7) Prime oil pump by squirt oil in the oil filter
mounting hole and filling the J-trap of the front tim­
ing cover. When oil is running out, install oil filter
that has been filled with oil.
(8) Apply a rearward axial load of 667 N (150 lbs-f)
on crankshaft centerline, driving No.3 main cap and
- < - - - S.OL ENGINE 9 -139
Fig. 21 Upper Main Bearing Removal and
Installation with Tool C-3059
thrust bearing against No.3 bulkhead. Repeat proce­
dure, driving crankshaft forward to align rear flange
of thrust bearings in a common plane. Front face of
No.l main cap must not extend forward in front of
face of No.l bulkhead.
(9) Install the oil pickup tube. Tighten the bolts to
16 N-m (144 in. lbs.) torque.
(10) Install the oil pan.
CRANKSHAFT MAIN BEARINGS
Bearing caps are not interchangeable and should
be marked at removal to ensure correct assembly.
Upper and lower bearing halves are NOT inter­
changeable. All lower main bearing halves are inter­
changeable. Upper main bearing halves of No. 2, 4,
and 5 are interchangeable. Upper main bearing
halves of No. 1 and 6 are interchangeable, this also
applies to the lower bearing halves.
The No.3 main bearing is flanged to carry the
crankshaft thrust loads. This bearing is NOT inter­
changeable with any other bearing halves in the en­
gine. Bearing shells are available in standard and
the following undersizes: 0.25 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). Never install
an undersize bearing that will reduce clearance be­
low specifications.
REMOVAL
(1) Remove the oil pan and oil pump pick-up tube.
(2) Identify bearing caps before removal. Remove
bearing caps one at a time.
(3) Remove upper half of bearing by inserting
Crankshaft Main Bearing Remover/Installer Tool
C-3059 into the oil hole of crankshaft (Fig. 21).
(4) Slowly rotate crankshaft clockwise, forcing out
upper half of bearing shell.