🏷️ Basic Information

Make:

Triumph

Model:

Herald

Model Variant:

12/50

Engine Code Identifier:

Likely OHV inline-four, specific codes detailed within manual

👋 Introduction

Target Audience:

Owners, mechanics, and restorers of Triumph Herald 12/50 models.

Value Proposition:

Provides a critical resource for maintaining and repairing a classic British automobile, enhancing ownership experience and vehicle longevity.

Comprehensiveness:

Extremely detailed, covering nearly every aspect of the vehicle's mechanical and electrical systems.

Accessibility:

Instant download format ensures immediate access for urgent repairs or planning.

Visual Aid Quality:

High-quality illustrations, exploded diagrams, and photographs for clear procedural understanding.

📋 Manual Details

Model Years Covered:

1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971

Total Pages:

415

Type:

Workshop Service Repair Manual

Language:

English

File Format:

PDF

📖 Manual Coverage

Engine Service:

Comprehensive diagnosis, repair, removal, installation, and adjustment of engine components.

Fuel System:

Carburetor service (likely Solex or similar), fuel pump, fuel lines, and tank maintenance.

Cooling System:

Radiator, water pump, thermostat, hoses, and fan service.

Ignition System:

Distributor, coil, spark plugs, wiring, and timing adjustments.

Transmission Manual:

Service, repair, and adjustment of the manual gearbox.

Transmission Overdrive:

Service and operation of any fitted overdrive unit (e.g., Laycock de Normanville).

Clutch:

Removal, installation, adjustment, and service of the clutch assembly.

Driveshafts And Differentials:

Maintenance and repair of driveshafts, universal joints, and the rear axle/differential unit.

Suspension Front:

Service of the independent front suspension, including wishbones, kingpins, and shock absorbers.

Suspension Rear:

Maintenance of the rear axle, leaf springs, and associated components.

Steering:

Service and adjustment of the steering column, linkages, and steering rack/box.

Brakes Hydraulic:

Service of master cylinder, wheel cylinders, brake lines, and fluid replacement.

Brakes Mechanical:

Adjustment and maintenance of the brake shoes, drums, and parking brake mechanism.

Electrical System:

Wiring diagrams, starter motor, generator/alternator, battery, lighting, and ancillary components.

Bodywork And Chassis:

Repair procedures for the unitary construction body, doors, windows, and trim.

Interior:

Information on seats, dashboard, trim panels, and controls.

Heating And Ventilation:

Service of heater matrix, controls, and ducting.

Routine Maintenance:

Oil changes, filter replacements, lubrication points, and general inspections.

Troubleshooting Diagnostics:

Systematic fault finding for common and uncommon issues.

Disassembly And Assembly:

Step-by-step instructions for removing and refitting all major components.

Adjustments:

Detailed procedures for setting clearances, timing, and control linkages.

Repair Rebuild:

In-depth guidance for rebuilding major mechanical assemblies.

Special Tool Usage:

Identification and illustrated application of necessary special service tools.

Level Of Detail:

Comprehensive, suitable for both professional mechanics and experienced DIY enthusiasts.

Diagnostic Information:

Includes diagnostic procedures, symptom analysis, and specific troubleshooting charts.

Specification Lists:

Extensive lists of service data, including wear limits and critical measurements.

Pictorial Diagrams:

Abundant with detailed illustrations, exploded diagrams, drawings, and photos.

Torque Specifications:

Extensive torque charts for all critical fasteners and assembly points.

Wear Limits:

Precise wear limits provided for engine components, brake parts, and suspension elements.

📊 Manual Specifications

Readability:

High-resolution PDF, searchable text for easy navigation.

Printability:

Fully printable, allowing users to print specific sections or the entire manual.

Digital Binding:

Instant Download PDF

Digital Paper Equivalent:

Digital representation of high-quality technical documentation.

Operating Systems:

Windows, Mac, and Linux OS compatible due to PDF format.

Software Requirement:

Adobe Reader or compatible PDF viewer.

⚙️ Engine Specifications

Engine Type:

Overhead Valve (OHV) Inline-Four Cylinder

Displacement:

Approximately 1296 cc (for the 12/50 model, derived from the 1200cc engine with modifications)

Horsepower Output:

Around 50-60 bhp (specific figures may vary depending on tuning and exact configuration).

Torque Output:

Detailed torque figures for all fasteners and engine sub-assemblies are provided.

Carburetor Type:

Likely a single Solex carburetor (e.g., Solex 32 PICT or similar), manual details specific model and tuning.

Fuel Type:

Petrol (Gasoline), manual will specify octane requirements.

Configuration:

Front-mounted, longitudinal engine.

🔧 Transmission

Gearbox Type:

4-speed manual gearbox

Overdrive Availability:

Optional Laycock de Normanville overdrive (typically affecting 3rd and 4th gears).

Gear Ratios:

Specific gear ratios for standard and overdrive transmissions are detailed in the manual.

📐 Dimensions

Wheelbase:

Approx. 2172 mm (85.5 inches)

Length:

Approx. 3734 mm (147 inches)

Kerb Weight:

Varies by body style, but generally around 800-900 kg (1750-2000 lbs).

🛡️ Safety Features

Crash Test Information:

Era-specific safety standards apply; manual focuses on mechanical integrity for safe operation.

Braking System:

Hydraulic drum brakes on all four wheels, disc front brakes on 12/50 models.

Chassis Design:

Unitary construction with integrated chassis frame, providing structural rigidity.

💡 Technology Features

Audio System:

Original equipment typically a basic AM radio; manual covers wiring and installation if upgrading.

Safety Systems:

Limited by era; emphasis is on mechanical systems ensuring reliable operation.

🔧 Maintenance

Engine Oil Change:

Typically every 3,000-5,000 miles or 6 months, depending on usage. Manual will provide definitive schedule.

Grease Points:

Regular lubrication of various chassis points (kingpins, shackle pins, etc.) is crucial. Interval detailed in manual.

Engine Oil:

Likely SAE 20W-50 or SAE 30 mineral oil. Manual specifies exact grade and capacity.

Gearbox Oil:

Likely a GL4 rated gear oil, e.g., SAE 90. Manual provides specific type and capacity.

Brake Fluid:

DOT 3 or DOT 4 glycol-based brake fluid. Manual specifies type and replacement interval.

Rust Susceptibility:

Common in classic cars; manual can guide on inspecting and repairing bodywork.

Suspected Wear Items:

Kingpins, suspension bushings, clutch components, and synchronized gearbox components can wear over time. Manual details inspection and replacement.

Carburetor Tuning:

Manual provides detailed procedures for carburetor adjustment and maintenance.

📚 Vehicle History

Manufacturer:

Standard-Triumph (later part of British Leyland).

Development:

The Herald was designed by Giovanni Michelotti and known for its body-on-frame construction and independent suspension. The 12/50 was an upgraded version of the Herald 1200, featuring a larger engine and improved features.

Production Period:

1959-1971 for the Herald range; the 12/50 model specifically launched in 1963.

🏆 Awards & Recognition

Design Awards:

While specific awards for the Herald are not prominently documented, Giovanni Michelotti's design was well-regarded in its time.