Installation; Spark Plug; Description - Platinum Plugs; Removal - Chrysler 300M Service Manual

8I - 8 IGNITION CONTROL
KNOCK SENSOR (Continued)

INSTALLATION

The sensors screws into the cylinder block, directly
below the intake manifold.
(1) Install knock sensor. Tighten knock sensor to
10 N·m (7 ft. lbs.) torque. Over or under tighten-
ing effects knock sensor performance resulting
in possible improper spark control.
(2) 2.7L Install the passenger side cylinder head,
refer to the Engine section.
(3) Attach electrical connector to knock sensor.
(4) Install intake manifold plenum. Refer to the
Engine section.

SPARK PLUG

DESCRIPTION - PLATINUM PLUGS

The V6 engines use platinum resistor spark plugs.
They have resistance values of 6,000 to 20,000 ohms
when checked with at least a 1000 volt tester. For
spark plug identification and specifications, Refer to
the Specifications section.
Do not use an ohm meter to check the resis-
tance of the spark plugs. This will give an inac-
curate reading.
When the spark plugs use a single or double plat-
inum tips and they have a recommended service life
of 100,000 miles for normal driving conditions per
schedule A in this manual. The spark plugs have a
recommended service life of 75,000 miles for severe
driving conditions per schedule B in this manual. A
thin platinum pad is welded to both or just the cen-
ter electrode end(s) as shown in (Fig. 14). Extreme
care must be used to prevent spark plug cross
threading, mis-gapping (Fig. 15) and ceramic insula-
tor damage during plug removal and installation.
Fig. 14 Platinum Pads
1 - APPLY ANTI-SEIZE COMPOUND HERE ONLY
2 - PLATINUM SPARK SURFACE
CAUTION: Cleaning of the platinum plug may dam-
age the platinum tip.
Fig. 15 Setting Spark Plug Electrode Gap
1 - TAPER GAUGE

REMOVAL

Always remove the ignition coil assembly by grasp-
ing at the spark plug boot, turning the assembly 1/2
turn and pulling straight back in a steady motion.
(1) Prior to removing the spark plug, spray com-
pressed air around the coil area and spark plug.
(2) Remove electrical connector from ignition coil.
On 3.5L engines, it is necessary to loosen the
screws by alternating back and forth. Do not lose the
spacers under the coil when loosening the screws.
(3) Remove 2 fasteners from ignition coil.
(4) Remove ignition coil assembly.
(5) Remove the spark plug using a quality socket
with a rubber or foam insert.
(6) Inspect the spark plug condition.
INSTALLATION
Always remove the ignition coil assembly by grasp-
ing at the spark plug boot, turning the assembly 1/2
turn and pulling straight back in a steady motion.
(1) To avoid cross threading, start the spark plug
into the cylinder head by hand.
(2) 3.5L engines tighten spark plugs to 28 N·m (20
ft. lbs.) torque, 2.7L engine tighten spark plugs to
17.6 N·m (13 ft. lbs.).
(3) Install ignition coil assembly onto spark plug.
(4) Install coil screws and tighten: 2.7L engine to 6.2
N·m (55 in. lbs.), 3.5L engines to 6.7 N·m (60 in. lbs.).
(5) Connect the electrical connector.
LH