K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
2.
The hex head of the plug has a stamped in Julian date (figure 2, item 2) of 3378 or lower. The Julian date is the day of the year (such as December
3 being 337, December 4 being 338, etc.), followed by the last digit of the year (1998 being 8,1999 being 9, etc).
3.
Model identification located below the threads (figure 2, item 3) is stamped "AC 11G U.S.A." (note that this model glow plug does not have the
slashes between the letters).
In figure 3, this is the new style BERU glow plug (P/N 12563554) used in current production vehicles. This is not a low heat energy glow plug and
should not be replaced unless standard glow plug diagnostics indicate. This style glow plug can be identified by the following three characteristics:
1.
The insulator' color is black (figure 3, item 1).
2.
The hex head of the plug does not have a stamped Julian date (figure 3, item 2).
3.
Model identification located below the threads (figure 3, item 3) is not stamped. It does have an ink identifier of "AC DELCO" and some other ink
text.
If new glow plugs are required, use BERU style, P/N 12563554 (figure 3), or acceptable 11G, P/N 25168651 (figure 2). It is ok to mix the BERU style
plug and the acceptable 11G style plug for service installation.
Parts Information
Part Number
Description
12563554
Glow Plug, BERU
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
J4767
Glow Plugs, Replace
Use Published
Labor Time
