Chrysler RAM TRUCK 2500 1994 Service Manual page 837

9 - 116 8.0L ENGINE
•
FRONT I D .
TOWARDS THIS SIDE
M A I N BEARING
CAP
ORIENTATION BUTTON
TOWARDS FRONT
( L H . ONLY)
1,3,
5, 7 , 9
ORIENTATION BUTTON
TOWARDS REAR
(R.H. ONLY)
2, 4, 6,
8 ,
10
J9409-78
Fig. 14 Piston and Rod Orientation
(3) Remove the timing chain cover and gasket. Re­
move and discard the front crankshaft oil seal and
cover gasket.
(4) Remove the rear seal retainer. Remove and dis­
card the crankshaft rear oil seal and retainer gasket.
(5) Identify main bearing caps before removal (Fig.
15). Remove bearing caps and bearings one at a time.
(6) Remove the connecting rod bearing caps.
(7) 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
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 s a m e
direction a s the engine rotates.
LOWER M A I N
BEARINGS
CRANKSHAFT'
UPPER M A I N
BEARINGS
J9409-72
Fig. 15 Main Bearing Identification
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 N o . l , tighten
the bolts to 27 N-m (20 ft. lbs.) torque.
• Step 2—Starting with bearing cap N o . 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) Apply a rearward axial load of 667 N (150 lbs-f)
on crankshaft centerline, driving No.3 main cap and
thrust bearing against No.3 bulkhead. Repeat proce­
dure, driving crankshaft forward to align rear flange
of thrust bearings i n a common plane. Front face of
No.l main cap must not extend forward i n front of
face of No.l bulkhead.
(8) Install the oil pickup tube. Tighten the bolts to
16 N-m (144 in. lbs.) torque.
(9) 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-