Hummer H1 (2002+). Manual — part 23

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Engine 2-53

®

05745159

Fuel Injection Line Removal

NOTE:

Mark or tag fuel injection lines for installation refer-

ence.

1.

Disconnect lines at injector nozzles (Figure 2-75).

2.

Remove clamp and boot from lines at injection pump if
equipped.

3.

Disconnect and remove injection lines.

Figure 2-75: Fuel Injection Line Removal

Fuel Supply and Return Line Removal

1.

Loosen clamp and remove fuel supply hose from fuel
injection pump (Figure 2-76).

2.

Loosen clamps and remove fuel return hose from injection
pump and return line (Figure 2-76).

3.

Remove fuel return line clamps at right and left valve
covers.

4.

Loosen clamps securing fuel return hoses to fuel injectors.

5.

Remove fuel return jumper hoses and plugs at fuel
injectors.

Figure 2-76: Fuel Supply and Return Line Routing

INJECTION PUMP

INJECTION LINES

CLAMP

FUEL RETURN

HOSE

VALVE COVER STUD

FUEL RETURN HOSE

FUEL

FUEL INJECTION

PUMP

FUEL RETURN

HOSE CLAMP

PLUG

RETURN LINE

SUPPLY HOSE

FUEL

FUEL

RETURN HOSE

2-54

Engine

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Rocker Arm Cover Removal

1.

Remove injection line support bracket from studs
(Figure 2-77).

2.

Remove cover attaching bolts and studs.

3.

Remove rocker arm cover. Tap cover with rubber mallet
and twist it to remove. Do not pry on cover.

4.

Repeat procedure for opposite cover.

.

Figure 2-77: Rocker Arm Cover Removal

Rocker Arm Shaft and Pushrod Removal

1.

Remove rocker arm retainers and bolts (Figure 2-78).

2.

Mark or tag position of each rocker arm and shaft set
before removal.

3.

Remove rocker arm and shaft sets from cylinder head.

4.

Remove pushrods. Keep pushrods in removal order. Do
not intermix them.

5.

Repeat procedure for opposite rocker sets.

Figure 2-78: Rocker Arm and Shaft Removal

Fuel Injector Removal

1.

Remove fuel return hoses and clamps from injectors
(Figure 2-79).

2.

Remove fuel injectors and gaskets (Figure 2-79).

Figure 2-79: Fuel Injector Removal

Glow Plug Removal

Remove glow plugs from cylinder heads (Figure 2-80). Dis-
card any damaged plugs.

Figure 2-80: Glow Plug Removal

INJECTION LINE SUPPORT BRACKET

ROCKER ARM COVER

STUD

S02-084

PUSHROD

RETAINER

ROCKER ARM

AND SHAFT

SET (2 PER SIDE)

AND BOLT

GASKET

HOSE

CYLINDER HEAD

PLUG

FUEL

RETURN

HOSES

INJECTOR

GLOW PLUG

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Engine 2-55

®

05745159

Cylinder Head Removal

1.

Remove cylinder head bolts (Figure 2-81).

2.

Remove cylinder head from block.

3.

Remove cylinder head gasket. Discard gasket afterward.

4.

Repeat procedure for opposite cylinder head.

Figure 2-81: Cylinder Head and Gasket Removal

Valve Lifter Removal

1.

Remove lifter clamp plates from cylinder block
(Figure 2-82).

2.

Remove lifter guide plates from block.

NOTE:

Mark or tag lifters for installation reference. Keep

them in order of removal.

3.

Remove lifters from block with tool J–29834 (Figure 2-82).

Figure 2-82: Valve Lifters

CYLINDER HEAD

GASKET

ENGINE BLOCK

HEAD BOLTS

(17 PER HEAD)

VALVE LIFTER

CLAMP PLATE

GUIDE PLATES

LIFTER REMOVER J–29834

2-56

Engine

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Water Pump/Adapter Plate/Oil Fill Tube
Removal

1.

Remove oil fill tube from adapter plate (Figure 2-83).

Figure 2-83: Oil Fill Tube Removal

2.

Remove water pump and adapter plate from timing gear
cover (Figure 2-84). Note location of attaching studs and
bolts for installation reference.

Figure 2-84: Water Pump and Adapter

Plate Removal

3.

Remove water pump, attaching bolts, and separate pump
from adapter plate (Figure 2-85).

4.

Remove and discard gasket.

Figure 2-85: Water Pump, Adapter Plate,

and Gasket Disassembly

Fuel Injection Pump Removal

1.

Remove electrical connections, fuel inlet and return lines
from pump.

2.

Remove driven gear attaching bolts and remove gear from
fuel injection pump (Figure 2-86).

3.

Remove injection pump attaching nuts and washers from
front cover studs.

4.

Remove fuel injection pump and gasket from timing gear
cover. Discard gasket.

Figure 2-86: Fuel Injection Pump and Driven Gear

Removal

OIL FILL TUBE

ADAPTER PLATE

WATER PUMP

WATER PUMP AND

ADAPTER PLATE ASSEMBLY

WATER PUMP

ADAPTER

PLATE

GASKET

6-S02-187.1

DRIVEN GEAR

FRONT COVER

STUD

GASKET

ELECTRONIC

INJECTION

PUMP