Dodge Dakota Sport 2001 Service Manual page 1206

AN
PISTON RINGS (Continued)
Fig. 78 Measuring Piston Ring Side Clearance
1 - FEELER GAUGE
(6) Rotate the ring around the piston, the ring
must rotate in the groove with out binding.
PISTON RING SPECIFICATION CHART
Ring Position
Clearance
Upper Ring .051-.094mm
(0.0020- .0037 in.)
Intermediate 0.04-0.08mm
Ring
(0.0016-0.0031 in.)
Oil Control .019-.229mm
Ring
(Steel Rails) (.0007-.0090 in.)
Ring Position Ring Gap
Upper Ring 0.23-0.39mm
(0.009-0.015 in.)
Intermediate 0.40-0.66mm
Ring
(0.015-0.026 in.)
Oil Control 0.028-0.79mm
Ring
(Steel Rail) (0.011- 0.031 in.)
Groove Maximum
Clearance
0.11mm
(0.004 in.)
0.10mm
(0.004 in.)
.25mm
(0.010 in.)
Wear Limit
0.43mm
(0.0017 in.)
0.74mm
(0.029 in.)
1.55mm
(0.061 in.)
(7) The No. 1 and No. 2 piston rings have a differ-
ent cross section. Ensure No. 2 ring is installed with
manufacturers I.D. mark (Dot) facing up, towards top
of the piston.
NOTE: Piston rings are installed in the following
order:
• Oil ring expander.
• Upper oil ring side rail.
• Lower oil ring side rail.
• No. 2 Intermediate piston ring.
• No. 1 Upper piston ring.
(8) Install the oil ring expander.
(9) Install upper side rail (Fig. 79) by placing one
end between the piston ring groove and the expander
ring. Hold end firmly and press down the portion to
be installed until side rail is in position. Repeat this
step for the lower side rail.
(10) Install No. 2 intermediate piston ring using a
piston ring installer (Fig. 80).
(11) Install No. 1 upper piston ring using a piston
ring installer (Fig. 80).
(12) Position piston ring end gaps as shown in
(Fig. 81). It is important that expander ring gap is at
least 45° from the side rail gaps, but not on the pis-
ton pin center or on the thrust direction.
Fig. 79 Side Rail—Installation
1 - SIDE RAIL END
VIBRATION DAMPER
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(3) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
ENGINE 4.7L 9 - 177