Dodge RAM TRUCK 1500 1995 Service Manual page 1014

PISTON
3 0 Z 3 >
4
J9109-66
Fig. 5 Piston Pin Diameter
other damage. Damage to this part can cause stress
risers which will progress to breakage.
Measure the connecting rod pin bore (Fig. 6). The
maximum diameter is 40.042 mm (1.5784 inch). If
out of limits, replace the connecting rod.
CONNECTING
Fig, 6 Connecting Rod Pin Bore
mMMB&WMm m©m BEARING AND
CRANKSHAFT JOURNAL C L E A R A N C E
Measure the connecting rod bore with the bearings
installed and the bolts tightened to 100 N-m (78 ft.
lbs.) torque.
Record the smaller diameter.
Measure the diameter of the .rod journal at the lo­
cation shown (Fig. 7). Calculate the average diameter
for each side of the journal.
The clearance is the difference between the con­
necting rod bore {smallest diameter) and the average
diameter for each side of the crankshaft journal.
If the crankshaft is within limits, .replace the bear­
ing. If the crankshaft is out of limits, grind the
crankshaft to the next smaller size and use oversize
rod bearings.
S J L (DIESEL) ENGINE 9 -173
MIN, 68.962 mm {2.7)5 inch)
MAX, 69.013 mm (2.717 inch)
Out-of-Round - Max,
0.050 mm (0.002 Inch)
Taper - Max,
0.013 mm (0.0005 Inch)
Bearing Clearance - Max.
0.089 mm (0.0035 Inch)
J 9 1 0 9 - 9 1
Fig. 7 Connecting Rod Journal Diameter Limits
PISTON GRADING
When rebuilding an engine with the original cylin­
der block, crankshaft and pistons, make sure the pis­
tons are installed in the original cylinder.
If replacing the piston(s), make sure the replace­
ment piston(s) are the same grade as the original pis­
ton.
If a new cylinder block or crankshaft is used, the
piston grading procedure MUST be performed to de­
termine the proper piston grade for each cylinder.
PISTON GRADING PROCEDURE
(1) Install any of the original connecting rod and
piston assemblies into the No.l cylinder. DO NOT in­
stall the piston rings.
(2) Install the upper bearing shell in the connect­
ing rod with the tang of the bearing in the slot of the
connecting rod. The connecting rod bearing shell
must be installed in the original connecting rod and
cap. Use clean lubricating oil to coat the inside diam­
eter of. the connecting rod bearing shell.
(3) Install the bearing shell in the connecting rod
cap with the tang of the bearing in the slot to the
cap. Use clean lubricating oil to coat the inside diam­
eter of, the bearing shell.
(4) The four digit number stamped on the connect­
ing rod and cap at the parting line must match and
be installed on the oii cooler side of the engine; In-