GMC Jimmy 1970-1991 5.7L Engine Specifications
Explore detailed 5.7L engine specifications for the 1970-1991 GMC Jimmy. This guide covers horsepower, torque, compression ratio, and more, ideal for maintenance, repair, and performance upgrades.
Overview Specifications
This document provides detailed specifications and technical information about the 5.7L engine used in the 1970-1991 GMC Jimmy. It is designed to assist enthusiasts, mechanics, and owners in understanding the engine's features, performance, and maintenance requirements. Use the search and navigation instructions to quickly find relevant information or explore the sections for a comprehensive understanding of the engine's design and capabilities.
How to Use
Use the search bar to enter keywords related to the 5.7L engine, such as 'horsepower,' 'torque,' or 'fuel system.' Results will highlight relevant sections and subsections for quick access.
Scroll through the sections to explore major topics like engine performance, dimensions, and maintenance. Click on subsection titles to expand detailed technical points for each topic.
Key Specifications
Displacement
5.7L (350 cu in)
Horsepower
165-210 HP
Torque
275-300 lb-ft
Fuel Economy
10-14 MPG
Engine Weight
575 lbs
Available Specifications
Engine Performance
This section covers the performance characteristics of the 5.7L engine, including horsepower, torque, and fuel efficiency. It also provides insights into the engine's power delivery and how it contributes to the GMC Jimmy's overall driving experience.
Engine Performance
This section covers the performance characteristics of the 5.7L engine, including horsepower, torque, and fuel efficiency. It also provides insights into the engine's power delivery and how it contributes to the GMC Jimmy's overall driving experience.
Horsepower and Torque
- Horsepower: 165-210 HP (varies by year and configuration)
- Torque: 275-300 lb-ft (varies by year and configuration)
- Peak horsepower achieved at 4,000 RPM
- Peak torque achieved at 2,800 RPM
- Designed for reliable low-end torque for off-road capability
- Performance influenced by carburetor or fuel injection system
Fuel Efficiency
- Average fuel economy: 10-14 MPG (city/highway)
- Equipped with a 4-barrel carburetor or throttle-body injection
- Fuel tank capacity: 25-30 gallons
- Designed for heavy-duty use, prioritizing power over efficiency
- Optional fuel-saving technologies in later models
- Maintenance tips to improve fuel efficiency
Engine Dimensions and Design
This section details the physical dimensions and design features of the 5.7L engine, including its displacement, cylinder configuration, and weight. It also highlights key design elements that contribute to its durability and performance.
Engine Dimensions and Design
This section details the physical dimensions and design features of the 5.7L engine, including its displacement, cylinder configuration, and weight. It also highlights key design elements that contribute to its durability and performance.
Physical Dimensions
- Displacement: 5.7 liters (350 cubic inches)
- Cylinder configuration: V8
- Bore: 4.00 inches
- Stroke: 3.48 inches
- Engine weight: approximately 575 lbs
- Compact design for easy installation in the GMC Jimmy
Design Features
- Cast iron block and cylinder heads for durability
- Overhead valve (OHV) design for simplicity and reliability
- Hydraulic lifters for reduced maintenance
- High-capacity oil pump for improved lubrication
- Balanced crankshaft for smooth operation
- Optional aluminum intake manifold in later models
Maintenance and Tuning
This section provides guidance on maintaining and tuning the 5.7L engine to ensure optimal performance and longevity. It includes tips for routine maintenance, common issues, and performance upgrades.
Maintenance and Tuning
This section provides guidance on maintaining and tuning the 5.7L engine to ensure optimal performance and longevity. It includes tips for routine maintenance, common issues, and performance upgrades.
Routine Maintenance
- Oil change interval: every 3,000-5,000 miles
- Recommended oil viscosity: 10W-30 or 10W-40
- Spark plug replacement: every 30,000 miles
- Air filter replacement: every 15,000 miles
- Coolant flush: every 50,000 miles
- Regular inspection of belts and hoses
Common Issues and Solutions
- Common issue: carburetor clogging in early models
- Solution: regular cleaning and use of fuel additives
- Common issue: oil leaks from valve covers
- Solution: replace gaskets and tighten bolts
- Common issue: overheating in high-stress conditions
- Solution: upgrade cooling system components
Search Specifications
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Engine Specifications
Overview
- Type
- V8
- Configuration
- 90-degree V
- Platform
- GM Small-Block
- Material
- Cast iron block and heads
- Location
- Front-engine, rear-wheel drive
- Displacement
- 5.7 liters (350 cubic inches)
Dimensions
- Length
- 29.5 inches (749 mm)
- Width
- 24.5 inches (622 mm)
- Height
- 27.5 inches (698 mm)
- Weight
- 575 lbs (261 kg)
- Bore
- 4.00 inches (101.6 mm)
- Stroke
- 3.48 inches (88.39 mm)
- Deck Height
- 9.025 inches (229.2 mm)
- Main Journal Diameter
- 2.45 inches (62.23 mm)
Materials
- Block
- Cast iron
- Cylinder Heads
- Cast iron
- Pistons
- Aluminum alloy
- Crankshaft
- Forged steel
- Connecting Rods
- Forged steel
Features
- Ignition System
-
- Electronic ignition
- Distributor-based
- High-energy spark plugs
- Fuel System
-
- 4-barrel carburetor
- Mechanical fuel pump
- Air-fuel ratio adjustment
- Cooling System
-
- Water-cooled
- Thermostat-controlled
- Radiator with electric fan
- Lubrication System
-
- Full-pressure oiling
- Oil pump with bypass
- Oil cooler optional
- Exhaust System
-
- Cast iron exhaust manifolds
- Dual exhaust optional
- Catalytic converter (post-1975)
- Performance Features
-
- High-flow cylinder heads
- Hydraulic lifters
- Dual-plane intake manifold
Safety Features
- Engine Protection
-
- Low oil pressure warning light
- Coolant temperature sensor
- Emission Control
-
- PCV valve
- EGR system (post-1975)
- Catalytic converter (post-1975)
- Fire Prevention
-
- Heat shields on exhaust
- Insulated fuel lines
Comfort Features
- Noise Reduction
-
- Rubber engine mounts
- Insulated intake manifold
- Vibration Control
-
- Balanced crankshaft
- Harmonic balancer
- Climate Control
-
- Heater core integration
- Air conditioning compatibility
- Drivability
-
- Smooth idle
- Responsive throttle
Accessories
- Engine Bay
-
- Alternator
- Power steering pump
- Air conditioning compressor
- Cooling System
-
- Radiator
- Electric fan
- Thermostat
- Ignition System
-
- Distributor
- Ignition coil
- Spark plug wires
Maintenance
- Service interval
- Every 3,000 miles or 3 months
- Service Items
-
- Oil and filter change
- Spark plug inspection
- Timing adjustment
- Coolant flush
- Belt tension check
- Maintenance Notes
- Regular valve lash adjustment recommended for optimal performance.
Warranty
- Basic Warranty
- Miles: 12,000Years: 1Coverage: Engine components
- Powertrain Warranty
- Miles: 50,000Years: 5Coverage: Engine, transmission, drivetrain
- Emissions Warranty
- Miles: 50,000Years: 5Coverage: Catalytic converter, EGR system
- Corrosion Warranty
- Miles: 100,000Years: 10Coverage: Rust perforation
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Sand casting for block and heads
- CNC machining for critical components
- Dynamic balancing of rotating assembly
- Quality Control
- inspection: 100% component testingTolerances: Within 0.001 inches for critical dimensionsTesting: Dyno testing for performance validation
- Sustainability Practices
-
- Recycled materials in casting
- Closed-loop cooling system
- Low-emission manufacturing
- Production Metrics
- Units Per Day: 500Defect Rate: 0.5%Energy Usage: 50 kWh per engine
Service Information for 5.7l engine Service
Maintenance and service requirements specific to this component
- Oil and filter change
- Spark plug inspection
- Timing adjustment
- Coolant level check
- Belt tension inspection
Use only recommended oil viscosity for optimal performance.
- Coolant flush and replacement
- Fuel filter replacement
- Distributor cap and rotor inspection
- Valve lash adjustment
- Compression test
Check for vacuum leaks and adjust carburetor if necessary.
- Timing chain replacement
- Water pump inspection
- Thermostat replacement
- Complete engine tune-up
- Compression and leak-down test
Inspect for oil leaks and replace gaskets as needed.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 5.7L engine compatible with other GMC models from 1970-1991?
Is the 5.7L engine compatible with other GMC models from 1970-1991?
The 5.7L engine, also known as the 350 V8, is compatible with various GMC models from 1970-1991, including the GMC Jimmy, Suburban, and Sierra. However, compatibility depends on the specific model year and configuration. Always verify engine mounts, transmission type, and wiring harness compatibility before installation. Cross-referencing part numbers with the vehicle's VIN is recommended.
Q2 What are the maintenance requirements for the 5.7L engine?
What are the maintenance requirements for the 5.7L engine?
The 5.7L engine requires regular maintenance to ensure longevity. Change the oil and filter every 3,000-5,000 miles, inspect spark plugs and wires every 30,000 miles, and replace the timing belt every 60,000-100,000 miles. Regularly check coolant levels, belts, and hoses for wear. Use high-quality fuel and follow the manufacturer's recommended service intervals for optimal performance.
Q3 How do I install or replace the 5.7L engine in a 1970-1991 GMC Jimmy?
How do I install or replace the 5.7L engine in a 1970-1991 GMC Jimmy?
To install or replace the 5.7L engine, first disconnect the battery and drain fluids. Remove the hood, radiator, and accessories like the alternator and power steering pump. Disconnect the transmission and engine mounts. Use an engine hoist to lift the engine out. Install the new engine by reversing the steps, ensuring proper alignment of mounts and connections. Torque bolts to specifications and refill fluids.
Q4 What are common troubleshooting steps for the 5.7L engine?
What are common troubleshooting steps for the 5.7L engine?
Common issues with the 5.7L engine include overheating, poor fuel economy, and rough idling. Check for coolant leaks, clogged radiators, or faulty thermostats for overheating. Inspect the fuel system, including injectors and filters, for fuel economy issues. For rough idling, examine spark plugs, wires, and the ignition system. Use a diagnostic scanner to identify error codes for further troubleshooting.
Q5 How can I optimize the performance of the 5.7L engine?
How can I optimize the performance of the 5.7L engine?
To optimize the 5.7L engine, consider upgrading the air intake and exhaust systems for better airflow. Use high-performance spark plugs and ignition coils for improved combustion. Regularly tune the engine and ensure proper timing. Adding a performance chip or reprogramming the ECU can enhance power and efficiency. Always use premium fuel and synthetic oil for best results.
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 Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and troubleshooting for the 5.7L engine and other components.
Technical Service Bulletin for 5.7L Engine Updates
Coming SoonLatest updates and fixes for the 5.7L engine, including recalls and performance improvements.
GMC Jimmy Parts and Accessories Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 1970-1991 GMC Jimmy, including engine components.
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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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