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The information contained in this Guide is 100% original to The Diesel Page. Throughout the years, we've spent considerable time in an engine rebuilding facility, toured the AM General/GEP 6.5L diesel engine plant, answered tens of thousands of technical and troubleshooting questions from as many 6.2/6.5 diesel owners, and have developed dozens of brand-new and original solutions to 6.2/6.5 diesel problems. But perhaps most important is our nearly 24 years of first-hand ownership experience with the GM 6.2L, 6.5L and Duramax diesel engines. All of this information was compiled into a 98 page (8-1/2 x 11) Guide that is both easy to read and understand. In most cases, individual aspects of engine problem diagnosis include theory of operation, which will help you understand why things work the way they do. Knowing the "how and why" of system operation will help a diesel owner analyze individual problems and help provide a long-term solution.

We've performed nearly every conceivable maintenance operation possible with these engines and have learned what it takes to get the most out of them. This Guide will show you parts of your engine you've probably never seen, and will explain many innovative and money saving maintenance procedures not discussed in any other manual of this kind. This Guide is a "must have" for any 6.2L/6.5L owner.


  • No Start
  • Hard Starting
  • Rough Running
  • Excessive Black Smoke
  • Excessive White Smoke
  • Engine Stalls
  • Low Power
  • Low Fuel Mileage
  • Coolant Leakage
  • Excessive Oil Consumption
  • Unusual Engine Sounds and Vibration
  • 1982-84 Glow Systems
  • 1985-93 Glow Systems
  • 1994+ Glow Systems
  • Overheating
  • Surviving a Trip to the Mechanic

The Removal & Replacement section contains removal and replacement information for most diesel and mechanical systems that bolt to the 1982 6.2L to 1999 6.5L shortblock. This Guide is different from most other maintenance manuals covering this subject in that not only will you find the specific information you need to do the work, but we'll also explain why some of the procedures and techniques are necessary, which can help produce a long-lasting repair.

    Removal & Replacement

  • Starter
  • Flywheel and Flexplates
  • Intake and Exhaust manifolds
  • Fuel Injectors
  • Fuel Injection Pump
  • Water pump
  • Fuel Lift pump (both electric and mechanical)
  • Vacuum pump
  • Glow Plugs
  • Cylinder Head Gaskets
  • 6.2 Rear main seal
  • Timing set and front cover
  • Water crossover and thermostat(s)
  • Fuel filters (82-99)
  • GM Diesel Parts Suppliers
  • Bolt torque specs
  • Diagnostic trouble codes

The 6.2L/6.5L Troubleshooting & Repair Guide is available separately for $29.95 + USPS Priority mail.
Please use the secure on-line order form to place your order or give us a call at 1-406-777-3675 M-F 9-6 mountain time.

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Copyright © 2016 by