14-06-04-005

File in Section:
Bulletin No.:
Service Bulletin
Date:
06 - Engine
14-06-04-005
July, 2014
INFORMATION
Subject:
Duramax® Diesel Glow Plugs Difficult to Install Due to Carbon Buildup - New Glow
Plug Bore Reamer Available
Models:
2001-2010 Chevrolet Kodiak
2001-2015 Chevrolet Express, Silverado 2500/3500
2001-2009 GMC Topkick
2001-2015 GMC Savana, Sierra 2500/3500
Equipped with Diesel Engine RPOs LB7, LLY, LMM, LGH or LML
Technicians may find that glow plug installation is
difficult due to carbon building up in the bore.
Carbon may build up around the glow plug tip during
normal engine operation and cause difficulty with the
installation of a new glow plug.
EN-51249 Glow Plug Bore Reamer is now available for
removing carbon. It is non-threaded so that it can work
on multiple model years.
3955272
3955270
Instructions for use:
1. Apply wheel bearing grease to the inside of the
flutes of the reamer to retain carbon.
2. Install the reamer into the glow plug bore and turn
with a ratchet while applying slight pressure in
the bore.
3. Remove the reamer occasionally to clean any
carbon from the flutes and re-apply grease.
4. Repeat steps 2 and 3 until the reamer’s hex drive
is at the same height as the hex drive of a fully
installed glow plug.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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