Coil Rail - 4.0L: Description

A one-piece coil rail assembly containing three individual coils is used on the 4.0L 6-cylinder engine. See Fig 1. The coil rail must be replaced as one assembly. The bottom of the coil is equipped with 6 individual rubber boots to seal the 6 spark plugs to the coil. Inside each rubber boot is a spring. The spring is used for a mechanical contact between the coil and the top of the spark plug. These rubber boots and springs are a permanent part of the coil and are not serviced separately. See Fig 1.

The coil is bolted directly to the cylinder head. See Fig 2. One electrical connector (located at rear of coil) is used for all three coils.

Fig 1: Ignition Coil Assembly-4.0L 6-Cylinder Engine

Courtesy of DAIMLERCHRYSLER CORP.

1 - CYL. #6

2 - CYL. #5

3 - CYL. #4

4 - CYL. #3

5 - CYL. #2

6 - CYL. #1

7 - COILS (3)

8 - MOUNTING BOLTS (4)

9 - BOLT BASES (4)

10 - RUBBER BOOTS (6)

Fig 2: Ignition Coil Rail Location-4.0L 6-Cylinder Engine

Courtesy of DAIMLERCHRYSLER CORP.

1 - COIL RAIL

2 - COIL MOUNTING BOLTS (4)

3 - COIL

4 - COIL ELECTRICAL CONNECTION