Triumph 3TA Twenty One 1963-1974 Workshop Service Repair Manual

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🏷️ Basic Information Identification Make: Triumph Model: 3TA Twenty One Production Years Covered: 1963-1974 Vehicle Type: Motorcycle Codes Engine Code: 3TA 👋 Introduction Market Position Target Audience: Mechanics and DIY...

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Type: Motorcycle

Vendor:

Sku: 201885

Tags: 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 3TA Motorcycle Motorcycles Triumph Twenty One

Product variants

Description

🏷️ Basic Information

Identification

Make:

Triumph

Model:

3TA Twenty One

Production Years Covered:

1963-1974

Vehicle Type:

Motorcycle

Codes

Engine Code:

👋 Introduction

Market Position

Target Audience:

Mechanics and DIY enthusiasts

Competitive Analysis

Value Proposition:

Provides essential data, characteristics, instructions, and methodology for repair interventions, offering detailed procedures, explanations, and pictorial diagrams.

Key Features

Delivery Method:

Instant Download

Completeness:

100% Complete and Intact

📋 Manual Details

Coverage Areas

All Systems:

Specific Components:

Engine, Transmission, Clutch, Fuel System, Electrical System, Chassis, Suspension, Brakes, Bodywork, Lubrication

Page Count

Total Pages:

Manual Type

Type:

Workshop Service Repair Manual

Language

Language:

English

Format

File Format:

📖 Manual Coverage

Systems Covered

Engine Overhaul:

Transmission Service:

Electrical Diagnostics:

Carburetor Tuning:

Suspension And Forks:

Brake System Maintenance:

Procedures Included

Routine Maintenance:

Troubleshooting Guide:

Disassembly And Assembly:

Adjustments And Settings:

Component Replacement:

Wiring Diagrams:

Technical Depth

Depth:

Comprehensive (from basic maintenance to complete engine rebuilds)

Level Of Detail:

Step-by-step instructions with detailed explanations and pictorial diagrams

📊 Manual Specifications

File Format

File Type:

Print Quality

Printability:

Yes, all pages are printable

Binding Type

Binding Type:

N/A (Digital PDF)

Paper Type

Paper Type:

N/A (Digital PDF)

Requirements

Software Requirement:

Adobe Reader

Compatibility:

Windows, Mac, Linux OS

⚙️ Engine Specifications

Primary Engine

Engine Type:

OHV Vertical Twin

Displacement:

249cc (approx.)

Bore X Stroke:

57mm x 48.8mm (typical for 3TA)

Performance

Horsepower Estimate:

Approx. 17-18 BHP (at 7000 RPM)

Torque Estimate:

Approx. 15-16 lb-ft (at 5000 RPM)

Fuel System

Carburetor Type:

Single Amal Monobloc (typically 22mm or 24mm)

Fuel Type:

Unleaded gasoline (with appropriate octane rating and potential lead substitute additive)

Ignition System

Ignition Type:

Coil and Distributor (or Magneto for some earlier models), Lucas or Wipac ignition systems common

🔧 Transmission

Standard

Transmission Type:

4-speed Constant Mesh

Optional

Optional Gearbox:

N/A (standard 4-speed)

Features

Clutch Type:

Wet multi-plate

Gear Ratios:

Specific ratios provided within the manual for each gear.

📐 Dimensions

Exterior

Wheelbase:

Approx. 54 inches (1372 mm)

Length:

Approx. 80 inches (2032 mm)

Weights

Dry Weight:

Approx. 340-350 lbs (154-159 kg)

🛡️ Safety Features

Ratings

Safety Standard:

Adherence to contemporary motorcycle safety standards of the era; manual emphasizes safety precautions.

Active Features

Braking System:

Drum brakes front and rear

Passive Features

Frame Construction:

Duplex cradle frame

💡 Technology Features

Infotainment

Infotainment System:

N/A (Classic Motorcycle)

Driver Assistance

Driver Assistance Systems:

N/A (Classic Motorcycle)

Connectivity

Connectivity Features:

N/A (Classic Motorcycle)

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 1,500-2,000 miles or annually (details within manual)

Valve Clearance Check:

Recommended at initial service and every 3,000-4,000 miles (details within manual)

Fluid Specifications

Engine Oil Type:

SAE 20W/50 or SAE 30 (mineral oil recommended for period correct engines, specific grades provided in manual)

Transmission Oil Type:

Gear oil (specific viscosity and type detailed in manual)

Primary Chaincase Oil Type:

Engine oil (same as engine oil, specific capacity detailed in manual)

Known Issues

Common Wear Points:

Valve guides, piston rings, clutch plates, gearbox bearings, electrical connections.

Carburetor Issues:

Float bowl leaks, needle wear, jet clogging, leading to rough running or fuel leaks.

Electrical Faults:

Fraying wiring, faulty ignition coils, worn distributor points, headlight/taillight issues.

Technical Specifications

Spark Plug Type:

Champion L7Y or equivalent (specific gaps provided in manual)

Tire Pressure Front:

Approx. 24-26 PSI (laden/unladen variations provided in manual)

Tire Pressure Rear:

Approx. 28-30 PSI (laden/unladen variations provided in manual)

Primary Chain Tension:

Specific slack measurement and adjustment procedure detailed in manual.

Wheel Alignment:

Wheel spoke tensioning and trueing procedures are vital and covered.

📚 Vehicle History

Brand Heritage

Manufacturer Origin:

United Kingdom

Model Evolution

Series Introduction:

The 3TA 'Twenty One' was a development of Triumph's earlier unit-construction parallel twins, positioned as a more practical and accessible model.

Production

Production Period:

The 3TA variant was produced from the late 1950s into the mid-1960s, with this manual covering up to 1974, indicating ongoing support or specific export markets.

🏆 Awards & Recognition

Recognitions

Brand Reputation:

Triumph motorcycles are historically renowned for their performance, styling, and British engineering heritage.

Model Segment:

Popular middleweight motorcycle of its era, often chosen for commuting and general riding.