Series 638 – Section 2.9 Glow Plugs

Section 2.9
Glow Plugs

The glow plug protrudes into the combustion chamber of each cylinder. When activated, a high tip temperature heats the combustion chamber to provide improved cold start ability.‪

Section 2.9.1
Replacement of Glow Plugs

To determine if replacement of the glow plugs are necessary, perform the following procedure. See Figure "Flowchart for Replacement of Glow Plugs" .‪

Note: The glow plugs are a non-serviceable component and are replaced as a unit. No adjustment is required.

Figure 1. Flowchart for Replacement of Glow Plugs

Section 2.9.2
Removal of Glow Plugs

Remove glow plugs as follows:‪

1. Disconnect glow plug connectors from glow plugs. See Figure "Glow Plug Harness and Glow Plug Location" .
   

   1.Glow Plug‪

   2.Glow Plug Harness‪

   Figure 2. Glow Plug Harness and Glow Plug Location

2. Remove glow plugs from cylinder heads, as necessary. See Figure "Glow Plug Harness and Glow Plug Location" .

Section 2.9.2.1
Inspection of Glow Plugs

Inspect glow plugs as follows:‪

1. Visually inspect glow plugs for external damage.
   1. If the glow plugs are damaged, replace the component as necessary. Refer to "2.9.3 Installation of Glow Plugs" .
   2. If the glow plugs are not damaged, reuse the component. Refer to "2.9.3 Installation of Glow Plugs" .

Section 2.9.3
Installation of Glow Plugs

Install glow plugs as follows:‪

1. Install glow plugs to the cylinder heads, as necessary. See Figure "Glow Plug Harness and Glow Plug Location" .
2. Install connector to the glow plugs, as necessary. See Figure "Glow Plug Harness and Glow Plug Location" .
3. Run the engine to verify repair.