Dodge dakota 2002 Service Manual page 1390

DR
PISTON RINGS (Continued)
PISTON RING SPECIFICATION CHART
Ring Position
Clearance
Upper Ring .051-.094mm
(0.0020- .0037
Intermediate 0.04-0.08mm
Ring
(0.0016-0.0031
Oil Control Ring .019-.229mm
(Steel Rails) (.0007-.0090
Ring Position Ring Gap
Upper Ring 0.20-0.36mm
(0.0079-0.0142
Intermediate 0.37-0.63mm
Ring
(0.0146-0.0249
Oil Control Ring 0.025-0.76mm
(Steel Rail) (0.0099- 0.03
(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. 78) 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. 79).
(11) Install No. 1 upper piston ring using a piston
ring installer (Fig. 79).
(12) Position piston ring end gaps as shown in
(Fig. 80). It is important that expander ring gap is at
Groove Maximum
Clearance
0.11mm
(0.004 in.)
in.)
0.10mm
(0.004 in.)
in.)
.25mm
(0.010 in.)
in.)
Wear Limit
0.43mm
(0.0017 in.)
in.)
0.74mm
(0.029 in.)
in.)
1.55mm
(0.061 in.)
in.)
least 45° from the side rail gaps, but not on the pis-
ton pin center or on the thrust direction.
Fig. 78 Side Rail—Installation
1 - SIDE RAIL END
Fig. 79 Upper and Intermediate Rings—Installation
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).
(4) Remove radiator upper hose.
(5) Remove upper fan shroud.
(6) Using Special Tools 6958 Spanner with Adapter
Pins 8346, loosen fan and viscous assembly from
water pump (Fig. 81).
(7) Remove fan and viscous assembly.
(8) Disconnect electrical connector for fan mounted
inside radiator shroud.
ENGINE - 4.7L 9 - 141