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SERIES 638 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. ‪

Replacement of Glow Plugs

To determine if replacement of the glow plugs are necessary, perform the following procedure. See Figure 28573 . ‪

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

Flowchart for Replacement of Glow Plugs

Removal of Glow Plugs

Remove glow plugs as follows: ‪

  1. Disconnect glow plug connectors from glow plugs. See Figure 27775 .

    1.Glow Plug ‪

    2.Glow Plug Harness ‪

    Glow Plug Harness and Glow Plug Location

  2. Remove glow plugs from cylinder heads, as necessary. See Figure 27775 .
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 section .
    2. If the glow plugs are not damaged, reuse the component. Refer to section .

Installation of Glow Plugs

Install glow plugs as follows: ‪

  1. Install glow plugs to the cylinder heads, as necessary. See Figure 27775 .
  2. Install connector to the glow plugs, as necessary. See Figure 27775 .
  3. Run the engine to verify repair.