Hummer H1 Service Manual page 172

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GLOW PLUG SERVICE
Glow Plug Tip Removal
(Damaged or Broken)
1. Remove fuel injector from necessary cylinder.
2. Using torsional damper bolt (Figure 3-47),rotate crankshaft
to bring affected piston to TDC position.
3. Using pliers, reach through injector nozzle port
(Figure 3-48), break off expanded tip, and remove from
prechamber.
4. Remove glow plug.
TORSIONAL DAMPER BOLT
Figure 3-47: Torsional Damper Bolt Location
5. Direct stream of low-pressure compressed air into glow
plug port. This will expel any remaining pieces of broken
tip through injector port.
NOTE: If the preceding methods fail to remove glow plug tip
remains from the prechamber, the cylinder head must be re-
moved to clear the broken pieces.
6. Install new glow plug.
7. Install fuel injector.
5745159
Fuel, Emissions, and Exhaust
INJECTOR PORT
GLOW PLUG PORT
Figure 3-48: Glow Plug and Injector Port Locations
Glow Plug Replacement
Removal
1. Disconnect wire from glow plug with tool J–39083.
2. Remove glow plug from cylinder head (Figure 3-49).
Figure 3-49: Glow Plug Removal/Installation
Installation
1. Install glow plug in cylinder head. Tighten plug to 8-12 lb-
ft (11-16 N•m) torque.
2. Connect wire to glow plug.
3-35
WIRE
GLOW PLUG