GMC Jimmy 1970-1991 6.2L Engine Specifications
Explore detailed 6.2L engine specifications for the 1970-1991 GMC Jimmy. Learn about horsepower, torque, fuel system, and more for maintenance, repair, and performance upgrades.
Overview Specifications
This document provides detailed specifications and technical information about the 6.2L diesel engine used in the 1970-1991 GMC Jimmy. It is designed to assist enthusiasts, mechanics, and researchers in understanding the engine's features, performance, and maintenance requirements. Use the search and navigation instructions to quickly find specific details or explore the sections for comprehensive insights.
How to Use
Use the search bar to enter keywords related to the 6.2L engine, such as 'torque,' 'horsepower,' or 'fuel system.' Results will highlight relevant sections and subsections for quick access.
Scroll through the sections to explore major topics like engine performance, design, and maintenance. Click on subsection titles to expand and view detailed technical points.
Key Specifications
Displacement
6.2L
Horsepower
130-160 hp
Torque
240-260 lb-ft
Fuel System
Indirect Injection
Cooling System
Liquid-Cooled
Available Specifications
Engine Performance
This section covers the performance characteristics of the 6.2L diesel engine, including horsepower, torque, and fuel efficiency. It also highlights the engine's capabilities in various driving conditions and its suitability for off-road and towing applications.
Engine Performance
This section covers the performance characteristics of the 6.2L diesel engine, including horsepower, torque, and fuel efficiency. It also highlights the engine's capabilities in various driving conditions and its suitability for off-road and towing applications.
Power Output
- Horsepower: 130-160 hp (varies by model year)
- Torque: 240-260 lb-ft (varies by model year)
- Peak torque achieved at 1,800-2,000 RPM
- Designed for low-end torque for off-road and towing
- Fuel efficiency: 18-22 MPG (combined)
- Turbocharged versions available in later years
Driving Dynamics
- Optimized for low-speed torque
- Suitable for heavy-duty applications
- Reliable performance in extreme conditions
- Limited high-RPM power due to diesel design
- Smooth power delivery for off-road use
- Improved towing capacity compared to gasoline engines
Engine Design
This section delves into the design and engineering of the 6.2L diesel engine, including its block construction, cylinder configuration, and cooling system. It also highlights key innovations and materials used in its manufacturing.
Engine Design
This section delves into the design and engineering of the 6.2L diesel engine, including its block construction, cylinder configuration, and cooling system. It also highlights key innovations and materials used in its manufacturing.
Block and Cylinders
- Cast iron block for durability
- V8 configuration with 6.2L displacement
- Bore: 3.98 inches, Stroke: 3.80 inches
- Overhead valve (OHV) design
- Indirect injection system
- Glow plugs for cold starts
Cooling and Lubrication
- Liquid-cooled system with radiator
- High-capacity oil pump for lubrication
- Oil cooler integrated into the system
- Thermostat-controlled cooling
- Dual thermostats in some models
- Designed for extended service intervals
Maintenance and Reliability
This section provides guidance on maintaining the 6.2L diesel engine, including recommended service intervals, common issues, and tips for ensuring long-term reliability. It also covers troubleshooting and repair best practices.
Maintenance and Reliability
This section provides guidance on maintaining the 6.2L diesel engine, including recommended service intervals, common issues, and tips for ensuring long-term reliability. It also covers troubleshooting and repair best practices.
Service Intervals
- Oil change: Every 3,000-5,000 miles
- Fuel filter replacement: Every 10,000 miles
- Air filter inspection: Every 15,000 miles
- Coolant flush: Every 30,000 miles
- Glow plug replacement: As needed
- Timing belt inspection: Every 60,000 miles
Common Issues
- Glow plug failure in cold climates
- Fuel injection pump wear over time
- Oil leaks from gaskets and seals
- Overheating due to cooling system issues
- Cracked cylinder heads in high-mileage engines
- Excessive smoke from exhaust
Search Specifications
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Engine Specifications
Overview
- Type
- V8 Diesel
- Configuration
- 90-degree V8
- Platform
- GM Light Truck
- Material
- Cast Iron Block and Heads
- Location
- Front, Longitudinal
Dimensions
- Length
- 29.5 inches (749 mm)
- Width
- 27.6 inches (701 mm)
- Height
- 28.3 inches (719 mm)
- Weight
- 650 lbs (295 kg)
- Bore
- 3.98 inches (101 mm)
- Stroke
- 3.80 inches (96.5 mm)
- Displacement
- 379 cubic inches (6.2 liters)
Materials
- Block
- Cast Iron
- Cylinder Heads
- Cast Iron
- Pistons
- Aluminum Alloy
- Crankshaft
- Forged Steel
- Valves
- Stainless Steel
Features
- Fuel System
-
- Indirect Injection
- Mechanical Fuel Pump
- Glow Plugs for Cold Starts
- Cooling System
-
- Water-Cooled
- Thermostatically Controlled
- Radiator with Electric Fan
- Lubrication
-
- Full Pressure Lubrication
- Oil Cooler
- High-Capacity Oil Pump
- Ignition
-
- Compression Ignition
- 24V Glow Plug System
- Mechanical Timing
- Air Management
-
- Naturally Aspirated
- Air Cleaner with Pre-Cleaner
- Turbocharged Option Available
Safety Features
- Engine Protection
-
- Low Oil Pressure Shutdown
- Overheat Warning System
- Fuel Shutoff Valve
- Emissions
-
- EGR System
- Catalytic Converter
- Diesel Particulate Filter
Comfort Features
- Noise Reduction
-
- Sound Dampening Materials
- Balanced Rotating Assembly
- Isolated Engine Mounts
- Vibration Control
-
- Harmonic Balancer
- Rubber Engine Mounts
- Balanced Crankshaft
Accessories
- Electrical
-
- Alternator
- Starter Motor
- Glow Plug Controller
- Cooling
-
- Radiator
- Water Pump
- Thermostat
- Fuel System
-
- Fuel Pump
- Fuel Filter
- Injectors
Maintenance
- Service interval
- Every 3,000 miles or 3 months
- Service Items
-
- Oil and Filter Change
- Fuel Filter Replacement
- Air Filter Inspection
- Coolant Level Check
- Glow Plug Inspection
- Maintenance Notes
- Use only recommended diesel engine oil and coolant. Regularly inspect belts and hoses for wear.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper-to-Bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Engine and Transmission
- Emissions
- Miles: 50,000Years: 2Coverage: Catalytic Converter and EGR System
- Corrosion
- Miles: 100,000Years: 6Coverage: Perforation from Rust
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Casting
- Machining
- Assembly
- Testing
- Quality Control
- inspection: 100% Engine TestingTolerances: Within 0.001 inchesDurability Testing: 500 Hours of Continuous Operation
- Sustainability Practices
-
- Recycled Materials in Castings
- Low-Emission Manufacturing
- Waste Reduction Programs
- Production Metrics
- Units Per Year: 50,000Defect Rate: Less than 0.1%Lead Time: 4 Weeks
Service Information for 6.2l engine Service
Maintenance and service requirements specific to this component
- Oil and Filter Change
- Fuel Filter Replacement
- Air Filter Inspection
- Coolant Level Check
- Glow Plug Inspection
Use only recommended diesel engine oil and coolant.
- Replace Air Filter
- Inspect Belts and Hoses
- Check Fuel Injectors
- Test Glow Plug System
- Inspect Cooling System
Ensure all connections are tight and free of leaks.
- Replace Timing Belt
- Inspect and Adjust Valves
- Check Compression
- Replace Water Pump
- Flush Cooling System
Critical to replace timing belt to prevent engine damage.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 6.2L engine compatible with other GMC models from 1970-1991?
Is the 6.2L engine compatible with other GMC models from 1970-1991?
The 6.2L diesel engine, used in the 1970-1991 GMC Jimmy, is compatible with other GMC and Chevrolet models from the same era, such as the Suburban, Blazer, and C/K series trucks. However, compatibility depends on the specific model year and configuration. Always verify engine mounts, transmission compatibility, and wiring harnesses before installation.
Q2 What are the maintenance requirements for the 6.2L engine?
What are the maintenance requirements for the 6.2L engine?
The 6.2L engine requires regular maintenance, including oil changes every 3,000-5,000 miles, fuel filter replacements every 15,000 miles, and air filter checks every 10,000 miles. Inspect the glow plugs and injectors annually, and ensure the cooling system is flushed every 30,000 miles. Regular valve adjustments and timing checks are also recommended for optimal performance.
Q3 How do I replace the 6.2L engine in a 1970-1991 GMC Jimmy?
How do I replace the 6.2L engine in a 1970-1991 GMC Jimmy?
To replace the 6.2L engine, disconnect the battery, drain fluids, and remove the radiator, fan, and accessory belts. Unbolt the transmission and engine mounts, then disconnect the wiring harness and fuel lines. Use an engine hoist to lift the engine out. Install the new engine by reversing the steps, ensuring proper alignment and torque specifications for all bolts and connections.
Q4 What are common troubleshooting steps for the 6.2L engine?
What are common troubleshooting steps for the 6.2L engine?
Common issues include hard starting, poor performance, and excessive smoke. Check the glow plugs, fuel injectors, and fuel pressure. Inspect the air intake and exhaust systems for blockages. Verify the timing and compression levels. If the engine overheats, inspect the cooling system and thermostat. Always refer to the service manual for detailed diagnostic procedures.
Q5 How can I optimize the performance of the 6.2L engine?
How can I optimize the performance of the 6.2L engine?
To optimize performance, upgrade the air intake and exhaust systems for better airflow. Use high-quality diesel fuel and additives to improve combustion. Regularly clean or replace the fuel injectors and glow plugs. Adjust the timing and ensure the turbocharger (if equipped) is functioning properly. Consider installing a performance chip for enhanced power and efficiency.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1970-1991 GMC Jimmy 6.2L Engine Service Manual
Coming SoonComprehensive guide covering engine specifications, maintenance procedures, and repair instructions for the 6.2L diesel engine.
Technical Service Bulletin for 6.2L Engine Updates
Coming SoonOfficial bulletin detailing updates, recalls, and technical fixes for the 6.2L engine used in GMC vehicles from 1970-1991.
6.2L Engine Parts and Accessories Catalog
Coming SoonCatalog listing OEM and aftermarket parts, including gaskets, seals, injectors, and performance upgrades for the 6.2L engine.
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General Information
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The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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