Dodge Nitro. Manual - part 106

1. Install the rocker arms, and pedestals (3) onto the shaft.  

2. Install dowel pins (2). See Fig. 161. Dowel pins (2) pass through the pedestal (3) into the exhaust rocker 

shafts. Dowel pins (2) should be pressed in until they bottom-out against the rocker shaft in the pedestal 
(3).  

3. Install rocker arm and shafts. See INSTALLATION.  

INSTALLATION 

SHAFT -ROCKER ARM 

Fig. 162: Identifying Timing Gear Components 
Courtesy of CHRYSLER LLC 

1. Rotate camshaft gears to the position shown in (1,8,9). See Fig. 162. With the camshaft gears in these 

positions the lobes are in a neutral position (no load to the valve). This will allow the rocker arm shaft 
assembly to be tightened into position with little or no valve spring load on it. 

NOTE:

Rocker arm and shaft assembly can be installed either prior to or after 
(preferred) cylinder head installation.

 

2007 Dodge Nitro R/T 

2007 ENGINE 4.0L - Service Information - Nitro

  

Fig. 163: Rocker Arm/Shaft Assembly Bolts Tightening Sequence 
Courtesy of CHRYSLER LLC 

2. Install the rocker arm and shaft assembly making sure that the identification marks face toward the front 

of engine for left head and toward the rear of the engine for right head.  

3. Tighten rocker arm/shaft assembly bolts in sequence to 31 N.m (275 in. lbs.). See Fig. 163.  

4. Install cylinder head covers. See INSTALLATION).  

TUBE -SPARK PLUG 

REMOVAL 

TUBE -SPARK PLUG 

 

2007 Dodge Nitro R/T 

2007 ENGINE 4.0L - Service Information - Nitro

  

Fig. 164: Using Suitable Locking Pliers To Remove Tube From Cylinder Head 
Courtesy of CHRYSLER LLC 

1. Remove cylinder head cover(s). See REMOVAL.  

2. Using suitable locking pliers, remove the tube from the cylinder head and discard tube. See Fig. 164.  

3. Clean area around spark plug with Mopar® Parts Cleaner or equivalent.  

INSTALLATION 

TUBE -SPARK PLUG 

1 - SPARK PLUG TUBE
2 - LOCKING PLIERS

 

2007 Dodge Nitro R/T 

2007 ENGINE 4.0L - Service Information - Nitro

  

Fig. 165: Camshaft, Rocker Arm Assembly & Cylinder Head 
Courtesy of CHRYSLER LLC 

1. Apply Mopar® Stud and Bearing Mount to a new tube (1) approximately 1 mm (0.039 in.) from the end 

of tube, in a 3 mm (0.118 in.) wide area. See Fig. 165.  

2. Install sealer end of tube (1) into the cylinder head. Then carefully install the tube (1) using a hardwood 

block and mallet. Install the tube (1) until it is seated into the bottom of the bore.  

1 - SPARK PLUG TUBE
2 - ROCKER ARM ASSEMBLY
3 - CAMSHAFT
4 - CAMSHAFT SEAL

 

2007 Dodge Nitro R/T 

2007 ENGINE 4.0L - Service Information - Nitro