Motorcraft OE Glow Plug
Components and Features
The primary purpose of the glow plug system is to warm
up the engine cylinders to improve cold engine starting.
How to Identify
Bad or Worn Glow Plugs
Heating rod with folds and dents
Connecting Bolt
Relays electrical current from the battery to the
control spiral.
Premium Insulation
Retains all electrical current entering plug body
while also making the plug waterproof.
Heating rod melted, melted through, or broken
Glow Pipe
Equal wall thickness throughout the body of
the glow plug. This helps protect the plug from uneven heating which can cause the plug to fail.
Control Spiral
First spiral of two-spiral technology. Attached to
the connection bolt, it relays and controls the
electrical current sent to the heating spiral.
Controls the temperatures throughout the
3 phases of burn.
1. Before the start
2. During the start
3. During engine operation (3 min)
Insulation Filling
Filled with high quality ceramic magnesite
powder. Packed so tightly the thin wires of
the heating and control spiral can withstand
oscillation without crossing, which could
create a short circuit.
Tip of heating rod damaged
DEALER STAMP HERE
Heating Spiral
Second spiral of two-spiral technology.
Made of highly temperature-resistant material
and positioned centered between the glow pipe
walls providing an equal glow. Heats to full glow
potential in 2 to 5 seconds.
DSLGLOWPLUGBRO 08-08 10M
© 2008 Ford Motor Company
Original Equipment
Glow Plugs
5-fold security for top quality:
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How to Recognize
Low Quality Glow Plugs
OE Approved
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1. Motorcraft Glow Plugs are the only glow plugs approved by the engine
manufacturer and Ford Motor Company.
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High Quality Standards
2. All glow plugs are built to exact specifications to ensure the
best possible fit and finish.
Long Lasting
3. Motorcraft Glow Plugs undergo a series of environmental tests against
corrosiveness and materials to help ensure long life.
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Summary
Motorcraft’s result is
the only glow plug
designed specifically
for your Ford Power
Stoke Diesel Engine.
The competition can
only attempt to recreate
our rigorous testing and
patented designs.
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Warranty
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5. Motorcraft glow plugs are covered by a 12 month/12, 000 mile
(20, 000 km) warranty. All warranties are backed by Ford Motor Company
and supported by more than 4, 000 Ford and Lincoln Mercury Dealerships
nationwide, or at originating place of service.
See dealer for limited-warranty details.
Potential Issues
1
Inferior insulation
Not waterproof
2
Threaded sheath is only
inserted, not sealed
Interruption of current flow
3
Filled with low-quality
magnesium powder
Poor insulation, expansion
of the glow pipe
4
Surface without surface
protection
Rusting in the drill hole
5
2-spiral technology
required, but only one
spiral is installed
Characteristic profile does not
conform to OE manufacturer’s
instructions
6
Cone does not fit
cylinder head
Installation problems,
damaged cylinder head
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Wall thickness is not even
Glow rod blow out
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The spiral is slanted in
the glow pipe
Short circuit
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Glow rod is not centered.
The glow plug is slanted
in the pre- or turbulence
chamber
Glow rod blow out
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Special Motorcraft Testing
4. Motorcraft Glow Plugs are subjected to special tests that are designed to
replicate the practical demands of daily running and garage repair. Motorcraft
expects a minimum of 10,000 ignition cycles from every glow plug produced.
Characteristics
12
15
spiral not designed
10 Glow
correctly
Shortened glow plug relay life
rod with hairline
11 Heating
cracks
Blow out
of glow rod bent,
12 Tip
heating rod too thin
Shorter service life
Heating rod tip filled with
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13 low quality magnesium
Defective, shorter service life
drilled, not
14 Point
properly welded
Blow out
does not meet
15 Protrusion
OE manufacturer’s specs
Starting problems
powder