Dodge 2000 DURANGO Service Manual page 608

DN
SERVICE PROCEDURES (Continued)
PISTON MEASUREMENT CHART
PISTON A DIA = PISTON
SIZE DIAMETER
MIN.
mm
(in.)
A —
B 101.580
(3.9992)
C 101.592
(3.9997)
D 101.605
(4.0002)
E —
DESCRIPTION
PISTON PIN BORE
RING GROOVE
HEIGHT
OIL RAIL
COMPRESSION
RAIL
TOTAL FINISHED
WEIGHT
ring gap should be between 0.508-0.762 mm (0.020-
0.030 inch). The oil ring gap should be 0.254-1.270
mm (0.010-0.050 inch).
(c) Rings with insufficient end gap may be prop-
erly filed to the correct dimension. Rings with
excess gaps should not be used.
(2) Install rings and confirm ring side clearance:
(a) Install oil rings being careful not to nick or
scratch the piston. Install the oil control rings
according to instructions in the package. It is not
necessary to use a tool to install the upper and
lower rails. Insert oil rail spacer first, then side
rails.
(b) Install the second compression rings using
Installation Tool C-4184. The compression rings
must be installed with the identification mark face
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)
101.618 101.630 101.643
(4.0007) (4.0012) (4.0017)
— —
SPECIFICATION
25.007 - 25.015 mm
(.9845 -.9848 in.)
4.033 - 4.058 mm
(.1588 -.1598 in.)
1.529 - 1.554 mm
(.0602 -.0612 in.)
470.8 2 grams
(16.607 .0706 ounces)
up (toward top of piston) and chamfer facing down.
An identification mark on the ring is a drill point,
a stamped letter "O", an oval depression or the
word TOP (Fig. 26) (Fig. 28).
(c) Using a ring installer, install the top com-
pression ring with the chamfer facing up (Fig. 27)
MAX.
(Fig. 28). An identification mark on the ring is a
drill point, a stamped letter "O", 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.
—
Fig. 26 Second Compression Ring Identification
1 – SECOND COMPRESSION RING (BLACK CAST IRON)
2 – CHAMFER
3 – TWO DOTS
Fig. 27 Top Compression Ring Identification
1 – TOP COMPRESSION RING (GRAY IN COLOR)
2 – CHAMFER
3 – ONE DOT
5.2L ENGINE
(Typical)
(Typical)
9 - 99