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