Typically twin SU HS4 carburetors; some early TR2 models might have used Zenith carburetors.
Ignition System
Ignition Type:
Distributor-based, coil ignition.
Cooling System
Cooling Method:
Water-cooled, typically with a radiator, fan (engine-driven), and thermostat.
Engine Codes
Engine Designations:
TR2: TS-engine, TR3/TR3A: TS-engine, TR3B: TS-engine (1798cc) or TSF/TSFV-engine (2138cc).
🔧 Transmission
Standard
Transmission Type:
4-speed manual synchromesh (Moss gearbox)
Optional
Overdrive Option:
Available on some models, typically Laycock de Normanville overdrive unit (e.g., J-type or A-type) controlling 3rd and 4th gears.
Features
Gear Ratios:
Detailed gear ratios for each model and overdrive option are provided in the manual.
Clutch
Clutch Type:
Dry single plate clutch.
Drivetrain
Rear Axle:
Live rear axle with spiral bevel and pinion differential. Specific ratios varied slightly.
📐 Dimensions
Exterior
Wheelbase:
Approx. 83 inches (2108 mm)
Overall Length:
Approx. 144 inches (3658 mm)
Overall Width:
Approx. 57 inches (1448 mm)
Height:
Approx. 50 inches (1270 mm) to the top of the windscreen frame.
Weights
Curb Weight:
Approx. 2000-2200 lbs (907-998 kg), depending on model and equipment.
Wheelbase
Track Front:
Approx. 47.25 inches (1199 mm)
Track Rear:
Approx. 47.00 inches (1194 mm)
🛡️ Safety Features
Ratings
Safety Standards:
Designed to mid-20th-century safety standards; lacks modern passive safety features like airbags or crumple zones.
Active Features
Braking System:
Front disc brakes for improved stopping power over drum brakes of the era; effective but require diligent maintenance.
Passive Features
Seatbelts:
Optional or aftermarket seat belts may have been fitted; original fitment was not standard on early models.
Windscreen:
Early TR2/TR3 had a basic glass windscreen; later TR3A/TR3B featured a slightly larger screen. Safety glass used.
💡 Technology Features
Infotainment
Audio System:
Original vehicles typically featured basic radio reception only (e.g., AM radio); modern upgrades common.
Driver Assistance
Driver Aids:
None beyond basic mechanical systems like effective brakes for the era.
Connectivity
Connectivity Features:
None inherent to the original vehicle design.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 3,000 miles or 6 months, consult manual for specifics.
Grease Points:
Regular lubrication of suspension, steering, and driveshaft U-joints is crucial, often at 1,000-mile intervals.
Tune Up Frequency:
Recommended annually or every 6,000 miles for ignition timing, carburetor adjustment, and general engine check.
Fluid Specifications
Engine Oil Type:
Classic engine oils (e.g., SAE 20W-50 or 20W-40) with ZDDP additive are recommended to protect flat tappet camshafts. Consult manual for specific grade.
Gearbox Oil:
GL4 rated gear oil (e.g., SAE 90 or 80W-90). GL5 is generally not recommended due to brass synchro rings. Specify type for Moss gearbox and overdrive.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (original spec likely DOT 3). Use fresh fluid annually due to hygroscopic nature.
Coolant Type:
Ethylene glycol-based antifreeze mixed with distilled water. Specific capacity noted in manual.
Known Issues
Engine Common Problems:
Oil leaks from engine seals, tappet noise, overheating if cooling system is not maintained, carburetor tuning sensitivity.
Chassis Common Problems:
Rust in sills, outriggers, and floor pans; wear in steering and suspension bushes; shimmy at speed if wheels/tires are unbalanced.
Wiring loom degradation, dynamo output issues, voltage regulator faults, Lucas components often temperamental.
📚 Vehicle History
Brand Heritage
Manufacturer:
Standard-Triumph (later part of British Leyland).
Model Evolution
Tr2 Introduction:
Introduced in 1953 as a successor to the TR1 prototype, aimed at the American market for a sporty, affordable convertible.
Tr3 Introduction:
Launched in 1955, featuring significant updates including a more powerful engine, a revised grille, and the addition of optional disc brakes.
Tr3A Introduction:
Introduced in 1957 (often referred to as TR3A due to the 'A' designation being unofficial but widely used), with a significant facelift including a full-width grille and revised interior.
Tr3B Introduction:
A hybrid model introduced in 1962 to bridge the gap until the TR4, featuring the TR4's 2138cc engine option and the TR3A body style with minor updates like a TSF chassis number prefix.