Hummer H2. Manual — part 110

NOTE: A Cylinder Head Assembly is a cylinder head fitted with valves, associated springs, retainers, and on
overhead camshaft cylinder heads (OHC), camshaft, camshaft bearings, lash adjusters, tappets and rockers.

Cylinder Head Assemblies

LONG BLOCK ASSEMBLIES

NOTE: A Long Block Assembly is a short block assembly together with a cylinder head assembly and all those
components fitted within the rocker or cam cover, and timing cover (the whole presented as an assembly). A
rebuilt or new oil pump, or kit shall be supplied or fitted as appropriate.

Long Block Assemblies

Condition

Code

Procedure

Adjustable valve lash is out of
specification

B

Require repair.

Combustion efficiency is reduced due to
carbon deposits in the combustion
chamber.

2

Suggest repair.

Combustion efficiency is reduced due to
carbon deposits on the intake valve.

2

Suggest repair.

Internal component failure (any
component)

A

Require repair or replacement of

cylinder head assembly. See note

below.

NOTE: It is Required that all other failure related components be inspected for cause and
condition. Additional components or assemblies may be Suggested for repair or
replacement, such as a water pump on a short block (reason code 4, technician's
recommendation based on substantial and informed experience).
For example:
If there is a failed head gasket with an external coolant leak, in addition to Requiring
replacement of the head gasket, inspection of the following for cause and condition is
Required: Block, Cooling System, Cylinder Head. It may be Suggested that additional
inspections be performed, such as the other head gasket on a V-type engine.

Condition

Code

Procedure

Combustion efficiency is reduced due to
carbon deposits in the combustion
chamber.

2

Suggest repair.

Internal component failure (any
component)

A

Require repair or replacement of the

long block assembly. See note below.

NOTE: It is Required that all other failure related components be inspected for cause and
condition. Additional components or assemblies may be Suggested for repair or
replacement such as a water pump on a short block (reason code 4, technician's
recommendation based on substantial and informed experience).
For example:
If there is a failed head gasket with an external coolant leak, in addition to Requiring
replacement of the head gasket, inspection of the following for cause and condition is

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards ENGINE PERFORMANCE AND MAINTENANCE

SHORT BLOCK ASSEMBLIES

NOTE: A Short Block Assembly is a cylinder block and all those components contained within the limits of the
block deck or decks, the pan rail, the block rear face and the timing cover (where fitted), including the
crankshaft.

Short Block Assemblies

ENGINE COMPONENTS

Service Procedures Required and Suggested for Proper Vehicle Operation

ACCELERATOR PEDAL POSITION SENSORS

Accelerator Pedal Position Sensors

Required: Block, Cooling System, Cylinder Head. It may be Suggested that additional
inspections be performed, such as the other head gasket on a V-type engine.

Condition

Code

Procedure

Combustion efficiency is reduced due to
carbon deposits in the combustion
chamber.

2

Suggest repair

Internal Component Failure (Any
Component)

A

Require repair or replacement of the

short block assembly. See note below.

NOTE: It is Required that all other failure related components be inspected for cause and
condition. Additional components or assemblies may be Suggested for repair or
replacement, such as a water pump on a short block (reason code 4, technician's
recommendation based on substantial and informed experience).
For example:
If there is a failed head gasket with an external coolant leak, in addition to Requiring
replacement of the head gasket, inspection of the following for cause and condition is
Required: Block, Cooling System, Cylinder Head. It may be Suggested that additional
inspections be performed, such as the other head gasket on a V-type engine.

Condition

Code

Procedure

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware threads
damaged

A

Require repair or replacement of hardware.

Attaching hardware threads
stripped (threads missing)

A

Require repair or replacement of hardware.

Connector broken

A

Require repair or replacement.

Connector (Weatherpack type)
leaking

A

Require repair or replacement.

Connector melted

A

Require repair or replacement. See note

below.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards ENGINE PERFORMANCE AND MAINTENANCE

ACCESSORY BELTS

Accessory Belts

NOTE: Determine cause and correct prior to repair or replacement of part.

Connector missing

C

Require replacement.

Inoperative

B

Require repair or replacement. Further

inspection required. See note below.

NOTE: Inoperative includes intermittent operation or out of OEM specification. Some
components may be serviceable; check for accepted cleaning procedure.

Missing

C

Require replacement.

Resistance out of specification

B

Require repair or replacement.

Terminal broken

A

Require repair or replacement.

Terminal burned, affecting
performance

A

Require repair or replacement. See note

below.

NOTE: Determine cause and correct prior to repair or replacement of part.

Condition

Code

Procedure

Terminal burned, not affecting
performance

2

Suggest repair or replacement.

Terminal corroded, affecting
performance

A

Require repair or replacement.

Terminal corroded, not affecting
performance

2

Suggest repair or replacement.

Terminal loose, affecting
performance

B

Require repair or replacement.

Terminal loose, not affecting
performance

1

Suggest repair or replacement.

Threads stripped (threads missing)

A

Require replacement.

Wire lead conductors exposed

B

Require repair or replacement.

Wire lead corroded

A

Require repair or replacement.

Wire lead open

A

Require repair or replacement.

Wire lead shorted

A

Require repair or replacement.

Condition

Code

Procedure

Alignment incorrect

B

Further inspection required. See note below.

NOTE: Determine cause of incorrect alignment and require repair.

Cracked

1

Suggest replacement.

Frayed

1

Suggest replacement.

Missing

C

Require replacement.

Noisy

2

Further inspection required. See note below.

NOTE: Determine cause of noise and suggest repair.

Plies separated

A

Require replacement.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards ENGINE PERFORMANCE AND MAINTENANCE

ACCESSORY PULLEYS

Accessory Pulleys

ACTUATORS

See Sensors and Actuators.

AIR CONDITIONING CYCLING SWITCHES

Air Conditioning Cycling Switches

Tension out of specification

B

Require adjustment or replacement.

Worn beyond adjustment range

B

Require replacement.

Worn so it contacts bottom of pulley

A

Require replacement.

Condition

Code

Procedure

Alignment incorrect

B

Require repair or replacement.

Attaching hardware broken

A

Require repair or replacement of hardware.

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware not functioning

A

Require repair or replacement of hardware.

Bent

A

Require replacement.

Cracked

A

Require replacement.

Loose

A

Require repair or replacement.

Missing

C

Require replacement.

Pulley damaged, affecting belt life

A

Require replacement.

Condition

Code

Procedure

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware threads
damaged

A

Require repair or replacement of hardware.

Attaching hardware threads
stripped (threads missing)

A

Require repair or replacement of hardware.

Connector broken

A

Require repair or replacement.

Connector (Weatherpack type)
leaking

A

Require repair or replacement.

Connector melted

A

Require repair or replacement. See note

below.

NOTE: Determine cause and correct prior to repair or replacement of part.

Connector missing

C

Require replacement.

Contaminated

A

Require repair or replacement. See note

below.

NOTE: Determine source of contamination, such as engine coolant, fuel, metal particles,

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards ENGINE PERFORMANCE AND MAINTENANCE