Home      Discussion      Topics      Dictionary      Almanac
Signup       Login
Detroit Diesel V8 engine

Detroit Diesel V8 engine

Overview
General Motors introduced a line of Diesel
Diesel engine
A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 V8 engine
V8 engine
A V8 engine is a V engine with eight cylinders mounted on the crankcase in two banks of four cylinders, in most cases set at a right angle to each other but sometimes at a narrower angle, with all eight pistons driving a common crankshaft....

 engines for their C/K pickup trucks
Chevrolet C/K
The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

 in 1982. This engine family, designed by GM division Detroit Diesel
Detroit Diesel
As a corporation, Daimler Trucks North America has decided to rename the company "DETROIT".Detroit Diesel Corporation is an American-based diesel engine producer headquartered in Detroit, Michigan, USA...

, was produced by GM through 2000, when it was replaced by the new Duramax line. AM General's subsidiary General Engine Products (GEP) still produces a military variant of this engine for the HMMWV.

The General Motors light-truck 6.2 and 6.5 L Diesel engines were optional in all 1982 through 2000 Chevrolet and GMC C/K series
Chevrolet C/K
The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

 pickup truck
Pickup truck
A pickup truck is a light motor vehicle with an open-top rear cargo area .-Definition:...

s, Suburbans
Chevrolet Suburban
Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....

, Blazer
Chevrolet Blazer
Chevrolet Blazer can refer to one of several SUV models from General Motors:* The full-size Chevrolet K5 Blazer, based on the C/K pickup chassis and built from 1969 to 1994....

/Jimmy, Tahoe
Chevrolet Tahoe
The Chevrolet Tahoe are full-size SUVs from General Motors. Chevrolet and GMC sold two different-sized SUVs under their Blazer/Jimmy model names through the early 1990s. This situation changed when GMC rebadged the full-size Jimmy as the Yukon in 1992...

/Yukon
GMC Yukon
The GMC Yukon refers to the basic platform used in both long and short versions of the truck chassis. Its main articles are here:*Chevrolet Suburban formerly GMC Suburban*Chevrolet Tahoe...

, van
Van
A van is a kind of vehicle used for transporting goods or groups of people.In British English usage, it can be either specially designed or based on a saloon or sedan car, the latter type often including derivatives with open backs...

s, and motor homes.
Discussion
Ask a question about 'Detroit Diesel V8 engine'
Start a new discussion about 'Detroit Diesel V8 engine'
Answer questions from other users
Full Discussion Forum
 
Unanswered Questions
Encyclopedia
General Motors introduced a line of Diesel
Diesel engine
A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 V8 engine
V8 engine
A V8 engine is a V engine with eight cylinders mounted on the crankcase in two banks of four cylinders, in most cases set at a right angle to each other but sometimes at a narrower angle, with all eight pistons driving a common crankshaft....

 engines for their C/K pickup trucks
Chevrolet C/K
The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

 in 1982. This engine family, designed by GM division Detroit Diesel
Detroit Diesel
As a corporation, Daimler Trucks North America has decided to rename the company "DETROIT".Detroit Diesel Corporation is an American-based diesel engine producer headquartered in Detroit, Michigan, USA...

, was produced by GM through 2000, when it was replaced by the new Duramax line. AM General's subsidiary General Engine Products (GEP) still produces a military variant of this engine for the HMMWV.

The General Motors light-truck 6.2 and 6.5 L Diesel engines were optional in all 1982 through 2000 Chevrolet and GMC C/K series
Chevrolet C/K
The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

 pickup truck
Pickup truck
A pickup truck is a light motor vehicle with an open-top rear cargo area .-Definition:...

s, Suburbans
Chevrolet Suburban
Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....

, Blazer
Chevrolet Blazer
Chevrolet Blazer can refer to one of several SUV models from General Motors:* The full-size Chevrolet K5 Blazer, based on the C/K pickup chassis and built from 1969 to 1994....

/Jimmy, Tahoe
Chevrolet Tahoe
The Chevrolet Tahoe are full-size SUVs from General Motors. Chevrolet and GMC sold two different-sized SUVs under their Blazer/Jimmy model names through the early 1990s. This situation changed when GMC rebadged the full-size Jimmy as the Yukon in 1992...

/Yukon
GMC Yukon
The GMC Yukon refers to the basic platform used in both long and short versions of the truck chassis. Its main articles are here:*Chevrolet Suburban formerly GMC Suburban*Chevrolet Tahoe...

, van
Van
A van is a kind of vehicle used for transporting goods or groups of people.In British English usage, it can be either specially designed or based on a saloon or sedan car, the latter type often including derivatives with open backs...

s, and motor homes. The engine was standard on AM General
AM General
AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

 HMMWV, Hummer H1
Hummer H1
The Hummer H1 is a civilian off-road vehicle based on the M998 Humvee, which was created by AM General. The vehicle was produced from 1992 through 2006, and was the first of what became the Hummer line...

 and Commercial Utility Cargo Vehicle
Commercial Utility Cargo Vehicle
The Commercial Utility Cargo Vehicle or CUCV Program was instituted to provide the United States military with a cheaper Light Utility Vehicle to augment the purpose-built, but expensive, Gama Goats and M151 series "Jeeps" approaching the end of their service life. It initially provided Dodge D...

 vehicles. The ready availability and low cost of these engines has made them popular for conversion projects and kit vehicles. These engines are often a popular choice for conversion in Land Rover
Land Rover
Land Rover is a British car manufacturer with its headquarters in Gaydon, Warwickshire, United Kingdom which specialises in four-wheel-drive vehicles. It is owned by the Indian company Tata Motors, forming part of their Jaguar Land Rover group...

s, Land Cruisers
Toyota Land Cruiser
The is a series of four-wheel drive vehicles produced by the Japanese car maker Toyota Motor Corporation. It is not related to the Studebaker Land Cruiser car produced in the US from 1934-1954....

, and similar vehicles.

6.2L


The original 6.2 L (379 cu in) Diesel V8 was introduced in 1982 for the Chevrolet/GMC C/K trucks
Chevrolet C/K
The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

 and was produced until 1993. The 6.2L diesel emerged as a high-MPG alternative to the V8 gasoline engine lineup, and achieved better mileage than the General Motors 4.3L V6 gasoline engines of the 80s, at a time when the market was focused on mileage more than power.

Applications

  • 1982–1993 Chevrolet/GMC C/K
    Chevrolet C/K
    The C/K is the name for Chevrolet and GMC's full-size pickup truck line from 1960 until 1999 in the United States, from 1965 to 1999 Canada, from 1964 through 2001 in Brazil, and from 1975 to 1982 in Chile. The first Chevrolet pickup truck appeared in 1924, though in-house designs did not appear...

  • 1992 - 1993 AM General
    AM General
    AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

     Hummer H1
    Hummer H1
    The Hummer H1 is a civilian off-road vehicle based on the M998 Humvee, which was created by AM General. The vehicle was produced from 1992 through 2006, and was the first of what became the Hummer line...

  • 198x - 1993 AM General
    AM General
    AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

     HMMWV
  • GM version of the CUCV
  • 1982-93 Chevrolet Van
    Chevrolet Van
    The Chevrolet and GMC G-Series vans were made by General Motors for North America. They are in the same vehicle class as the Ford Econoline van and the Dodge Ram Van.The term "Chevrolet van" also refers to the entire series of vans sold by Chevrolet...


Specifications

  • Engine RPO Codes: LH6 ('C' series, with EGR) and LL4 ('J' series)
  • Displacement: 6.2L / 379 cu in
  • Bore x Stroke: 3.98 by 3.8 in (101.1 by 96.5 mm)
  • Block / Head: Cast iron / Cast iron
  • Aspiration: Natural
  • Valvetrain: OHV 2-V
  • Compression: 21.5:1
  • Injection: Indirect
  • Horsepower / Torque (at start): 130 hp @ 3,600 rpm / 240 lbft @ 2,000 rpm
  • Horsepower / Torque (at final): 143 hp @ 3,600 rpm / 257 lbft @ 2,000 rpm
  • Horsepower / Torque (army): 165 hp @ 3,600 rpm / 330 lbft @ 2,100 rpm
  • Max RPMs: 3,600
  • Idle RPMs: 650 + or - 25


6.5L


The 6.5 L (395 cu in) version was introduced in 1992 to replace the 6.2. Most 6.5s are equipped with a turbo. This engine was never meant to be a power and torque competitor with Ford/International and Dodge/Cummins, but rather a simple designed workhorse engine that made credible power, achieved decent fuel economy and met emissions standards in half-ton trucks
Truck classification
In the United States, commercial truck classification is determined based on the vehicle's gross vehicle weight rating . The classes range from 1-8...

. The Duramax 6600 replaced the 6.5 in light trucks beginning in 2001 and the C3500HD medium duty cab and chassis (replaced by C4500 Kodiak/Topkick) and vans beginning in 2003, but the 6.5 (6500 Optimizer) is still produced by AM General
AM General
AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

 for the HMMWV.

There are several GM 6.5 liter diesel engine production options. The Turbocharged L56, (VIN "S") was used in most 1/2 ton (1500) and light duty 3/4 ton (2500) trucks. One percent of the 1/2 ton (1500) contained a naturally aspirated version of the 6.5. Heavy duty 3/4 ton and 1 ton trucks used the Turbocharged L65 (VIN "F") engine. The L56 is emissions controlled with EGR and catalytic converters. The L65 engine has no EGR, and has no catalytic converter
Catalytic converter
A catalytic converter is a device used to convert toxic exhaust emissions from an internal combustion engine into non-toxic substances. Inside a catalytic converter, a catalyst stimulates a chemical reaction in which noxious byproducts of combustion are converted to less toxic substances by dint...

. There is a soot trap on L65 engines that is often mistaken for a catalytic converter. The L49 (VIN "P") and L57 are both naturally aspirated engines. L57 is listed as HO or Heavy Duty. Additional RPO codes
Regular Production Option
A Regular Production Option is a General Motors standard coding for vehicle configuration options. These codes are a combination of 3 alphanumeric characters and refer to a specific option or modification to the vehicle...

 are LQM (175HP) and LQN (190HP).

Changes were made by GM to the 6.5 in their light trucks for emissions or reliability improvement. The 1992-1993 model years used a 6.5-specific Stanadyne DB-2 mechanical injection pump. GM replaced the DB-2 with the electronic throttle DS-4 in 1994-2000 vehicles. In mid-1996 GM implemented a redesigned engine cooling system incorporating twin non bypass-blocking thermostats and a 130 GPM
GPM
GPM may refer to:*GPM , a mouse server for the console and xterm*Gallons per minute, a unit of volumetric flow rate*Gallons per mile, a unit of fuel efficiency*General Purpose Macrogenerator, an early macro processor...

 water pump. This improved the flow through the block by 70-75% and flow to the radiator 7%.

Applications

  • 1994 - 1999 Chevy Blazer/ 2-door Tahoe / GMC Yukon/Chevy K-2500,K-3500
  • 1992 - 1999 Chevrolet Suburban
    Chevrolet Suburban
    Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....

     / GMC Suburban
  • 1992 - 1999 Chevrolet and GMC C/K
  • 2000 Chevrolet and GMC C/K 2500 & 3500
  • 2001 Chevrolet and GMC C/K 3500
  • 1994 - 2004 AM General
    AM General
    AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

     Hummer H1
    Hummer H1
    The Hummer H1 is a civilian off-road vehicle based on the M998 Humvee, which was created by AM General. The vehicle was produced from 1992 through 2006, and was the first of what became the Hummer line...

  • 1994–present AM General
    AM General
    AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

     HMMWV

Specifications

  • Engine RPO Codes: L49, L56, L57, L65, LQM, and LQN.
  • Displacement: 6.5L / 397 cu in
  • Bore x Stroke: 4.06 x 3.82 (in.)
  • Block / Head: Cast iron / Cast iron
  • Aspiration: Turbocharged (Borg-Warner GM-X series) Also available naturally aspirated.
  • Valvetrain: OHV 2-V
  • Compression: GM Early 21.3:1, GM Late 20.3:1, AMG/GEP Marine 18:1
  • Injection: Indirect
  • Power / Torque (lowest): 180 hp @ 3,400 rpm / 360 lbft @ 1,700 rpm
  • Power / Torque (highest): 215 hp @ 3,200 rpm / 540 lbft @ 1,800 rpm
  • Max RPMs: 3,400

Common problems

  • Main Bearing Web Crack: In both 6.2L and 6.5L engines this is reportedly fixed with a combination of improved higher nickel cast iron alloy and lower block re-design including, but not limited to, a main bearing girdle. These features are in the new for 2007 AM General GEP P400 6500 Optimizer enhanced 6.5L diesel presently being sold to the US Government for the 6 ton armored HMMWV.

  • Crank Failure: Related to age failures of the harmonic balancer, the vibration damped accessory drive pulley, or the dual mass flywheel.

  • Pump Mounted Driver: Relates to thermal failures. The PMD is screwed to the DS-4 injection pump on the 1994-2001 GM 6.5 diesel utilizing fuel flow to dissipate heat. The injection pump is mounted in the intake valley (a high heat area). The PMD contains two power transistors that should be cooled by proper contact with the injection pump body. If the pump is not precisely machined to make complete contact with the transistors via the silicone thermal gasket and paste, the PMD is improperly installed without the gasket or paste, the PMD is installed off center with the pump body, or corrosion develops on the mounting surface the PMD will overheat. Several companies manufacture an extension harness and heat-sink kits. These allow an owner or their mechanic to relocate the PMD away from the injection pump to a lower heat environment and/or a place that can get more air flow.

  • Cylinder Head Cracking: higher mileage 6.5 engines exhibit stress related fractures in the cylinder head bowl. Stronger cylinder heads remedy this problem.

Fuel system


The fuel system on both of these engines relies on a very basic setup. On the 6.2L engines, a camshaft driven mechanical lift pump draws fuel from the tank to the injection pump (also camshaft driven). On 6.5L engines, the lift pump is electrically powered. The injection pump delivers fuel precisely as the injectors need to fire correctly. The fuel system uses Indirect injection
Indirect injection
In an internal combustion engine, the term indirect injection refers to a fuel injection where fuel is not directly injected into the combustion chamber...

 and, on 1982-1993 engines, is completely mechanical, much like the Ford 6.9 & 7.3 International Harvester IDI fuel system utilizes. The 1994+ system is similar, but uses the electronically controlled Stanadyne DS4831 series of injection pumps instead of the mechanical DB2831 series found on 1992-1993 6.5's and the DB2829 found on 6.2's.

External Links