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Introduction
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Market Position
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Market Position:
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Essential resource for owners and mechanics of Holden HQ-HZ series vehicles, catering to the classic Australian car market and DIY repair community.
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Target Audience:
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Holden enthusiasts, owners of HQ-HZ models requiring maintenance or restoration, classic car mechanics, automotive students.
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Competitive Analysis
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Competitive Analysis:
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This digital service manual offers superior accessibility and portability compared to traditional paper manuals. Its comprehensive nature, detailed diagrams, and step-by-step instructions make it a highly competitive offering for maintaining and repairing these iconic vehicles.
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Key Features
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Key Features:
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Instant download access, portability via smart devices, grease-proof digital format, detailed illustrations and diagrams, comprehensive coverage for DIY and professional use, time-saving efficiency.
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Step By Step Instructions:
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All repair procedures are broken down into clear, sequential steps, making complex tasks manageable for users of all skill levels.
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Diagram And Illustration Quality:
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Features 'top quality diagrams' and 'highly detailed exploded pictures' aiding in clear understanding of complex assemblies and procedures.
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Manual Coverage
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Systems Covered
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Systems Covered:
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Engine, Drivetrain (Transmission, Differential), Fuel System, Cooling System, Exhaust System, Brakes (Hydraulic, Parking), Steering, Suspension (Front, Rear), Electrical System (Ignition, Lighting, Charging, Starting), Bodywork, Chassis, Climate Control (where applicable), Lubrication
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Electrical System Details:
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Detailed wiring diagrams for all models and options, troubleshooting of lighting, charging system (alternator/generator), starting system, ignition system, instrumentation, power windows/locks (where fitted), horn, and accessory circuits.
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Body And Chassis Coverage:
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Includes procedures for body panel alignment, door and window regulator repair, interior trim removal and installation, chassis lubrication, suspension component replacement, steering linkage service, and basic structural repair guidance.
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Fuel System Details:
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Includes carburettor identification and tuning (Stromberg, Holley, Rochester Quadrajet), fuel pump service, fuel filter replacement, fuel tank inspection and cleaning, and fuel line routing.
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Procedures Included
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Procedures Included:
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Routine Maintenance, Troubleshooting, Diagnostics, Component Removal and Installation, Component Rebuilding, Electrical System Testing and Repair, Body Repair, Chassis Alignment, Torque Specifications, Fluid Capacities and Specifications, Wiring Diagrams, Exploded Views
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Brake System Procedures:
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Front and rear brake component replacement (pads, shoes, drums, discs, calipers, wheel cylinders), brake line and hose inspection and replacement, master cylinder overhaul, brake booster service, bleeding procedures, parking brake adjustment and repair.
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Troubleshooting Methodology:
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Provides systematic diagnostic procedures, fault finding charts, and symptom-based troubleshooting guides for common issues across all major vehicle systems.
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Suspension Alignment Procedures:
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Detailed specifications and procedures for front-end alignment (camber, castor, toe-in) and rear-end alignment, essential for tyre wear and handling.
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Technical Depth
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Technical Depth:
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Comprehensive, from basic maintenance to in-depth repair and rebuilding. Suitable for DIY enthusiasts and professional mechanics.
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Engine Rebuilding Depth:
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Complete engine disassembly, inspection, machining recommendations, component replacement (pistons, rings, bearings, valves, camshafts), cylinder head overhaul, timing gear/chain replacement, gasket replacement, engine assembly and initial start-up procedures.
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Electrical Troubleshooting Depth:
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In-depth guidance for diagnosing electrical faults, including voltage drop testing, continuity checks, and interpretation of wiring diagrams.
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Manual Specifications
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File Format
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File Format:
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PDF (Portable Document Format)
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Searchable Text Availability:
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Likely searchable text, facilitating quick access to specific information.
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PDF Reader Recommendation:
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Adobe PDF Reader is recommended to ensure all images and graphics display correctly.
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Print Quality
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Print Quality:
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High-quality, designed for clear display of text and diagrams. Recommends Adobe PDF Reader for optimal viewing.
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Diagram Quality:
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High-quality, detailed diagrams, including exploded views and schematic illustrations essential for correct assembly and repair.
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Binding Type
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Binding Type:
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Digital download (no physical binding)
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Paper Type
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Paper Type:
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N/A (Digital format, printable on demand)
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Engine Specifications
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Primary Engine
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Primary Engine Options Hq Hj:
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173 cu in (2.8 L) Red I6, 202 cu in (3.3 L) Red I6, 253 cu in (4.2 L) Holden V8, 308 cu in (5.0 L) Holden V8
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Primary Engine Options Hx Hz:
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173 cu in (2.8 L) Red I6, 202 cu in (3.3 L) Red I6, 253 cu in (4.2 L) Holden V8, 308 cu in (5.0 L) Holden V8, 350 cu in (5.7 L) Chevrolet V8 (Optional on some models)
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Engine Block Materials:
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Cast Iron (Red I6 and Holden V8)
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Performance
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Performance Details:
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Horsepower and torque figures vary significantly by engine and specific model. Manual provides detailed specifications for each engine variant, including dyno-tested outputs and performance tuning advice.
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Compression Ratios:
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Varies by engine variant and year; manual will provide specific compression ratio figures for each.
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Fuel System
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Fuel System Types:
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Carbureted (single or multiple barrel), Fuel Injection (on later HX/HZ models with specific V8 engines, though less common than carbureted).
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Ignition System Details:
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Covers distributor maintenance, points and condenser adjustment/replacement, coil testing, spark plug selection, and ignition timing procedures for both points and electronic ignition systems.
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Transmission
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Standard
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Standard Transmission Options:
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3-speed manual, 4-speed manual (e.g., M21 'Super T10')
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Clutch Type:
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Dry single plate for manual transmissions.
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Optional
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Optional Transmission Options:
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2-speed Powerglide automatic, 3-speed Turbo Hydra-Matic automatic
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Features
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Transmission Features Covered:
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Clutch operation and adjustment, gearbox overhaul, torque converter service, transmission fluid specifications and change intervals, linkage adjustments.
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Gear Ratio Information:
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Manual will contain specific gear ratios for different transmission models and rear axle ratios, crucial for performance and economy tuning.
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Dimensions
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Exterior
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Exterior Dimensions:
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Varies by body style (Sedan, Wagon, Coupe, Ute, Van). Manual likely contains specific dimensions for each.
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Interior
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Interior Dimensions:
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Not typically detailed in service manuals beyond seat removal/installation and trim access.
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Cargo
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Cargo Dimensions:
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Relevant for Ute and Wagon variants; manual will cover cargo area access and related components.
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Weights
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Weight Specifications:
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Kerb weight, GVM (Gross Vehicle Mass), GCM (Gross Combination Mass) will be provided for different configurations.
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Wheel Bolt Pattern:
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Typically 5 x 105 mm or 5 x 114.3 mm (4.5 inches) depending on model and specifications.
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Tire Sizes:
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Common sizes include 165SR13, 175SR13, 185/70R13, 185HR14, 205/60R14, 205/65R15 depending on model and trim. Manual will list exact specifications.
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Maintenance
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Service Intervals
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Typical Service Intervals:
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Oil changes: 5,000 km or 3 months. Filter changes: With oil changes. Spark plugs: Varies by engine type, typically 20,000-40,000 km. Lubrication points: As per schedule, often every 5,000-10,000 km. Manual will provide specific intervals for each component and fluid.
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Timing Belt Chain Replacement:
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I6 engines use timing chains; V8s can use chains or belts depending on specific engine build (though chains are more common for this era). Manual will detail replacement intervals and procedures.
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Fluid Specifications
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Engine Oil Specifications:
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Viscosity grades like SAE 20W-50, 10W-30 depending on climate and engine type. API service classification (e.g., SF, SG). Manual will list precise specifications and capacities.
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Coolant Specification:
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Ethylene glycol based coolant with corrosion inhibitors. Typically a 50/50 mix with distilled water. Manual will specify type and capacity.
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Brake Fluid Specification:
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DOT 3 or DOT 4 hydraulic brake fluid. Manual will specify type and bleeding procedures.
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Transmission Fluid Specifications:
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Manual transmission: Gear oil (e.g., GL-4). Automatic transmission: Dexron-II or equivalent. Manual will detail types and capacities for all variants.
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Power Steering Fluid:
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Automatic transmission fluid (ATF) or dedicated power steering fluid depending on system design. Manual will specify.
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Differential Oil Specification:
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Hypoid gear oil of appropriate viscosity (e.g., SAE 90) and API GL-5 classification for most models. Manual will confirm specific type and capacity.
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Known Issues
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Common Issues Covered:
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Rust and corrosion (particularly in common areas like wheel arches, sills, door bottoms), carburettor tuning and maintenance, ignition system reliability, cooling system leaks, worn suspension components (bushings, ball joints), electrical gremlins, potential for rear axle seal leaks, clutch wear.
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Thermostat And Cooling System:
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Frequent checks of thermostat operation and radiator core condition are advised due to potential overheating in older systems.
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Vehicle History
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Brand Heritage
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Brand Heritage:
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Holden is an iconic Australian automotive brand, deeply ingrained in the nation's culture. The HQ-HZ series represents a significant period of Australian manufacturing and design innovation.
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Australian Icon Status:
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The HQ-HZ series are considered automotive icons in Australia, representing a peak in local manufacturing and design before the shift towards global platforms.
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Model Evolution
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Model Evolution Hq Hz:
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HQ (1971-1974): Complete redesign, introduction of longer wheelbase and wider track. HJ (1974-1976): Minor styling updates, introduction of new safety features. HX (1976-1977): Emissions controls introduced, minor styling tweaks. HZ (1977-1980): Introduction of Radial Tuned Suspension (RTS) across the range, further styling updates, improved safety.
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Radial Tuned Suspension Rts:
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Significant improvement introduced in HZ, offering enhanced ride comfort and handling, especially beneficial for touring and everyday driving.
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Coupe Variants:
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The HQ and HJ series famously included the stylish Holden Monaro coupe, which featured unique styling and often more powerful engine options.
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Production
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Production Period:
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1971 - 1980
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