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The Hummer Knowledge Base
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Engine:
Air Intake
Filters
Inexpensive Alternatives
"Vacuator" or "Flap" Valve
Block
Block Heaters
Replacing Block Heaters
CDR Valve
Testing
"Check Engine" Light
After Being Low on Fuel
Cleaning
Cleaning the Engine
Codes
- See
Parts/Tools/Service
under "Codes"
Cooling System
Bleeding the Cooling System
Coolant Temp Level
- Turbodiesels
Cooling Fan
Cooling System Care
-
From the U.S. Army. Requires
Adobe Reader (Acrobat)
Flushing
How to Increase the Cooling Capacity of the 6.5L Diesel Hummer
(pdf)
Forum Discussion
Low Coolant Light Comes On Intermittently
Radiators
Removing the Radiator in a 6.5L Turbodiesel
Temperature Differences
Testing for Air Leaks
Testing the Temperature Sensor
Thermal Cycling and Coolant Leaks
Turbodiesels Run Hotter
Water Pump Replacement on 6.2L Diesel
Cylinder Heads
Cracking
Head Gasket Replacement
Diagnostics
Scan Tool
Diesel Engines
6.2L Diesel Engine Rebuild
Diagnostic Parameters
- 5.7L, 6.2L and 6.5L - Requires
Adobe Reader (Acrobat)
The Diesel Page
- Recommended reading for 6.2L and 6.5L Diesel engine information.
Glowplugs
Cold-Starting Modifications
Controller
Fusible Links - Description
Fusible Links - Testing
GM Glowplug Components
How to Access Passenger-Side Glow Plugs
Ignition Timing
Leaking Glow Plug
Removing Swollen Glow Plugs
Replacement
Rusted Plug Removal
Starting Modifications
- "Wait to Start" Relay Mods and Glowplug Delay. By Allan Madar and Jeff Staud
Testing the Glow Plugs
Troubleshooting the Glow Plug System
Types of Glow Plugs
Ignition Timing
"Wait" Light
Duramax Engines
Conversion "Kit"
Emergency Fuel Shutoff Procedure
- If the engine doesn't stop running when turned off
"Engine Braking"
Engine Rebuilding or Replacement
Swapping for a Duramax, Cummins, Big Block Gas or Any Other Engine
Tips for Rebuilding
To a Cummins 5.9L
Exhaust
Borla Exhaust
Heat Shield Rattles
Modifications
Fan
Checking Fan Clutch
Fan Clutch Replacement
- by Allan Madar
Fan Removal Without Removing Radiator Stack
HMMWV Engine Fan diagnostics
(may or may not apply to civilian models)
How the Fan Clutch Works
Fast Idle
Gas Engine(s)
Gas Engine vs. Diesel Engine
Increasing Horsepower
Performance Chips
Spark Plug Wires
Testing the Fresh Air Cannister
Tune-Up
General Engine Products Inc. Engine Support Documents
- From AM General, click on "Enter as Guest" below the log-in form
Glow Plugs
- Under "Diesel Engine" above
Head Gasket
Checking for a Blown Head Gasket
Ignition
Key Stuck in Ignition
Main Bearing Seal
6.2L Main Bearing Seal Replacement
- A Microsoft Word document
6.2L Main Bearing Seal Replacement
- A PDF document
Maintenance
- See
Parts/Service/Maintenance
Neutral Safety Switch
Replacing the Neutral Safety Switch
Number 8 Cylinder Problem (Turbodiesel)
Diagnosing the No. 8 Cylinder Problem
Quick Check
OBD Codes
- See
Parts/Tools/Service
under "Codes"
Oil/Lubrication
Analysis
Dual Oil Filters
General Information About Oil
Ninety-Degree (90°) Oil Filter Adapter
Kit from SSDiesel Supply
Individual Parts Needed for DIY
Oil Leaks - Tracking Them Down
Oil Types for Diesel, Gas
PreLub Plus Install
Synthetic Lubricants
Do you Need Synthetic Motor Oil?
Oil Pan
Dropping/Removing the Oil Pan
Optical Sensor - Replacing
Serpentine Belt
Sizes of Serpentine Belts
Starting Fluid -
Don't Use It on a Diesel!
Starting Problems
Crank Sensor
Diagnosing Starting Problems Related to Fuel Systems
- .pdf document
Hard Starting, White Smoke
Starter Spins, but Doesn't Engage
Starting When Hot
- Diesel
Throttle Position Sensor (TPS)
Adjusting
Trouble Codes
- See
Parts/Tools/Service
under "Codes"
Turbocharger
Installing an Intercooler
Make Your Own Mechanical Wastegate Controller
Turbo Boost & Pyro Gauge Installation
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