Dodge ram truck 3500 1996 Service Manual page 1122

S - 132 8.0L E I G I I E
B R
S E R V I C E P R O C E D U R E S ( C o n t i n u e d )
TOP COMPRESSION RING
(GRAY IN COLOR)
CHAMFEP
J 9 0 0 9 - 4 8
Fig, 9 Top Compression Ring identification—Typical
CHAMFER TOP COMPRESSION
S E C O N D
C O M P R E S S I O N
RING
J9409-37
C H A M F E R
PISTON
Fig. 10 Compression Ring Chamfer Location-
Typical
T O P C O M P R E S S I O N R I N G G A P
U P P E R OIL R I N G G A P
S P A C E R
G A P
F R O N T
O F
E N G I N E
2ND C O M P R E S S I O N R I N G G A P
L O W E R O I L R A I L G A P
J9409-77
Fig. 11 Proper Ring Installation
FITTING CONNECTING ROD BEARINGS
Fit all rods on a bank until completed. DO NOT
alternate from one bank to another, because connect­
ing rods and pistons are not interchangeable from
one bank to another.
The bearing caps are not interchangeable and
should be marked at removal to ensure correct
assembly.
• Each bearing cap has a small V-groove across the
parting face. When installing the lower bearing shell,
make certain that the V-groove i n 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 i n 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.
FITTING 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
engine. 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
below specifications.
CRANKSHAFT SERVICE
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.