Dodge ram truck 3500 1996 Service Manual page 1088

I -18 5.9L ENGINE
BR
SERVICE PROCEDURES (Continued)
mark on the ring is a drill point, a stamped letter "0",
an oval depression or the word TOP (Fig. 9) (Fig. 11).
(e) Using a ring installer, install the top com­
pression ring with the chamfer facing up (Fig. 10)
(Fig. 11). An identification mark on the ring is a
drill point, a stamped letter "0", an oval depression
or the word TOP facing up.
(d) Measure side clearance between piston ring and
ring land. Clearance should be 0.074-0.097 mm (0.0029-
0.0038 inch) for the compression rings. The steel rail oil
ring should be free in groove, but should not exceed
0.246 mm (0.0097 inch) side clearance.
(e) Pistons with insufficient or excessive side
clearance should be replaced.
OIL RING
SPACER GAP
SECOND COMPRESSION RING
(BLACK CAST IRON)
CHAMFER
TWO
DOTS J9009-46
Fig. 9 Second Compression Ring identification (Typical)
TOP COMPRESSION RING
(GRAY IN COLOR)
CHAMFER
J9009-48
Fig. 10 Top Compression Ring Identification (Typical)
CHAMFER
TOP COMPRESSION
RING
S E C O N D
C O M P R E S S I O N
RING
i CHAMFER
•PISTON J9409-37
Fig. 11 Compression Ring Chamfer Location (Typical)
TOP
COMPRESSION
RING GAP
SECOND
COMPRESSION
RING GAP
OIL RING RAIL
GAP (TOP)
OIL RING RAIL
GAP (BOTTOM) J9309-80
Fig. 12 Proper Ring Installation
FITTING CONNECTING i O i 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 in the shell is in line
with the V-groove in the cap. This provides lubrica­
tion of the cylinder wall i n the opposite bank.
The bearing shells must be installed so that the
tangs are i n 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 . 0 0 1 inch).
Bearings are available i n 0.025 mm ( 0 . 0 0 1 inch),
0 . 0 5 1 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. Lower main bearing halves of No.2 and 4
are interchangeable.
Upper and lower No.3 bearing halves are flanged
to carry the crankshaft thrust loads. They are NOT
interchangeable with any other bearing halves i n the
engine (Fig. 13). Bearing shells are available in stan­
dard and the following undersizes:
0.25
mm
( 0 . 0 0 1
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.