Dodge Dakota Sport 2001 Service Manual page 1278

AN
PISTON & CONNECTING ROD (Continued)
STANDARD PROCEDURE - PISTON FITTING
Piston and cylinder wall must be clean and dry.
Specified clearance between the piston and the cylin-
der wall is 0.013-0.038 mm (0.0005-0.0015 inch) at
21°C (70°F).
Piston diameter should be measured at the top of
skirt, 90° to piston pin axis. Cylinder bores should be
measured halfway down the cylinder bore and trans-
verse to the engine crankshaft center line.
Pistons and cylinder bores should be measured at
normal room temperature, 21°C (70°F).
Check the pistons for taper and elliptical shape
before they are fitted into the cylinder bore (Fig. 38).
Fig. 38 Piston Measurements
1 - 49.53 mm
(1.95 IN.)
PISTON MEASUREMENT CHART
PISTON A DIA = PISTON
SIZE DIAMETER
MIN.
mm
(in.)
A —
B 101.580
(3.9992)
C 101.592
(3.9997)
BORE
DIAMETER
MAX. MIN.
mm mm mm (in.)
(in.) (in.)
— —
101.592 101.605 101.618
(3.9997) (4.0002) (4.0007)
101.605 101.618 101.630
(4.0002) (4.0007) (4.0012)
PISTON
SIZE
D
E
DESCRIPTION
PISTON PIN BORE
RING GROOVE
HEIGHT
COMPRESSION
TOTAL FINISHED
WEIGHT
REMOVAL
(1) Remove the engine from the vehicle (Refer to 9
- ENGINE - REMOVAL).
(2) Remove the cylinder head (Refer to 9 -
ENGINE/CYLINDER HEAD - REMOVAL).
(3) Remove the oil pan (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL).
(4) Remove top ridge of cylinder bores with a reli-
able ridge reamer before removing pistons from cyl-
inder block. Be sure to keep tops of pistons covered
during this operation.
(5) Be sure each connecting rod and connecting rod
cap is identified with the cylinder number. Remove
MAX.
connecting rod cap. Install connecting rod bolt guide
set on connecting rod bolts.
(6) Pistons and connecting rods must be removed
from top of cylinder block. When removing the
—
assemblies from the engine, rotate crankshaft so that
the connecting rod is centered in cylinder bore and at
BDC. Be careful not to nick crankshaft journals.
(7) After removal, install bearing cap on the mat-
ing rod.
CLEANING
Clean the piston and connecting rod assembly
using a suitable solvent.
ENGINE 5.9L
A DIA = PISTON
DIAMETER
MIN. MAX.
mm mm
(in.) (in.)
101.605 101.618
(4.0002) (4.0007)
— —
SPECIFICATION
25.007 - 25.015 mm
(.9845 - .9848 in.)
OIL RAIL 4.033 - 4.058 mm
(.1588 - .1598 in.)
1.529 - 1.554 mm
RAIL
(.0602 - .0612 in.)
470.8 ± 2 grams
(16.607 ± .0706 ounces)
9 - 249
BORE
DIAMETER
MIN. MAX.
mm mm (in.)
(in.)
101.630 101.643
(4.0012) (4.0017)
— —