Dodge Nitro. Manual — part 123

Fig. 219: Removing/Installing No. 1 And No.2 Piston Rings From Piston Using Ring Expander Tool
Courtesy of CHRYSLER LLC

1. Remove piston and connecting rod. See REMOVAL.

2. Remove No. 1 and No.2 piston rings from piston using a ring expander tool. See Fig. 219.

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

Fig. 220: Removing Upper Oil Control Ring Side Rail, Lower Oil Control Ring Side Rail & Oil
Control Ring Expander
Courtesy of CHRYSLER LLC

3. Remove upper oil control ring side rail. See Fig. 220.

4. Remove lower oil control ring side rail. See Fig. 220.

5. Remove oil control ring expander. See Fig. 220

1 - TOP PISTON RING
2 - CHROME INTERMEDIATE PISTON RING
3 - MICRO-NAPIER INTERMEDIATE PISTON RING
4 - OIL CONTROL RINGS
5 - SPACER

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

INSTALLATION

RING - PISTON

Fig. 221: Piston Rings
Courtesy of CHRYSLER LLC

1. Measure clearance of piston rings to the cylinder bore and piston. See STANDARD PROCEDURE.

The No. 1 and No. 2 piston rings have a different cross section. See

Fig. 221

. Insure that which ever

design No. 2 ring is installed, it is installed with manufacturers I.D. mark (dot) facing up, towards top of
the piston. See DESCRIPTION. . See Fig. 221.

1 - TOP PISTON RING
2 - CHROME INTERMEDIATE PISTON RING
3 - MICRO-NAPIER INTERMEDIATE PISTON RING
4 - OIL CONTROL RINGS
5 - SPACER

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

Fig. 222: Installing Side Rail
Courtesy of CHRYSLER LLC

Oil ring expander.

Lower oil control ring side rail.

Upper oil control ring side rail.

No. 2 Intermediate piston ring.

No. 1 Upper piston ring.

2. Install the side rail by placing one end between the piston ring groove and the spacer. Hold end firmly and

press down the portion to be installed until side rail is in position. Do not use a piston ring expander
tool during this step. See Fig. 222.

1 - SIDE RAIL END

CAUTION: Install piston rings in the following order:

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro