Category:
Classic British Sports Car
Target Audience:
Enthusiasts, restoration specialists, home mechanics, professional workshops.
Competitors:
MG T-series, Austin-Healey 3000, Alfa Romeo Giulietta Spider, Sunbeam Alpine.
Ease Of Use:
Step-by-step instructions, diagrams, and photos designed for clarity.
Comprehensiveness:
Covers all major mechanical, electrical, and body systems for four distinct models.
Value Proposition:
Enables owners to maintain, repair, and restore their classic Triumph sports cars effectively.
Engine Mechanical:
Complete disassembly, inspection, assembly, tuning of all engine variants.
Engine Electrical:
Ignition system, starting system, charging system, fuel injection (if applicable on later models).
Fuel System:
Carburetor (Stromberg, SU) overhaul, fuel pump, fuel lines, tank.
Cooling System:
Radiator, water pump, thermostat, hoses, fan.
Exhaust System:
Manifolds, pipes, mufflers, hangers.
Transmission Manual:
Gearbox overhaul (Moss box), clutch assembly, shift linkages.
Transmission Overdrive:
Laycock de Normanville overdrive unit (if equipped) repair and operation.
Drive Axle:
Rear axle assembly, differential, half-shafts, bearings.
Suspension Front:
Independent front suspension, kingpins, bushings, springs, shock absorbers.
Suspension Rear:
Live rear axle, leaf springs, Panhard rod (TR4), shock absorbers.
Steering System:
Steering column, steering rack (TR4), steering arms, tie rods, universal joints.
Braking System Front:
Disc brakes (TR3 onwards), calipers, pads, fluid.
Braking System Rear:
Drum brakes, wheel cylinders, shoes, brake master cylinder, hydraulic lines.
Electrical System Lighting:
Headlights, taillights, turn signals, interior lighting.
Electrical System Instruments:
Dashboard instruments (speedometer, tachometer, oil pressure, ammeter, fuel gauge), senders.
Electrical System Accessories:
Wipers, horn, heater (if factory fitted).
Body Chassis:
Frame repair, body panel alignment, door, bonnet, boot adjustments.
Interior:
Seating, dashboard trim, carpeting, weather sealing.
Wiring Diagrams:
Detailed, model-specific wiring diagrams for electrical systems.
Maintenance:
Routine servicing, lubrication, filter changes, spark plug replacement.
Troubleshooting:
Diagnosis of common problems and symptoms.
Repair:
Step-by-step instructions for component repair and replacement.
Overhaul:
Complete rebuild procedures for major mechanical components (engine, gearbox, axles).
Adjustment:
Carburetor synchronization, valve clearance, brake adjustments, ignition timing.
Installation:
Guidance for fitting replacement parts or accessories.
Depth:
Comprehensive - suitable for major overhauls, engine rebuilds, and advanced diagnostics.
Detail Level:
Detailed exploded views, torque specifications, clearances, and schematics.
Tr2/Tr3/Tr3A Engine:
Standard Triumph SP series OHV Inline-4
Tr2 Displacement:
1991 cc (121.5 cu in)
Tr3/Tr3A Displacement:
1991 cc (121.5 cu in) (early), 2138 cc (130.4 cu in) (later TR3A)
Tr4 Displacement:
2138 cc (130.4 cu in) (Standard Triumph 'slant four' engine)
Tr2 Horsepower:
Approx. 90 hp @ 4800 rpm
Tr3/Tr3A Horsepower:
Approx. 95-100 hp @ 5000 rpm (depending on specification)
Tr4 Horsepower:
Approx. 104 hp @ 4750 rpm
Torque:
Varies by engine, typically 115-135 lb-ft
Carburetion:
Twin SU H6 or Stromberg CD carburetors (standard).
Fuel Type:
Leaded gasoline (recommended for originality, unleaded with appropriate octane booster or hardened valve seats).
Oil Change:
Typically every 3,000 miles or 6 months, depending on usage.
Grease Points:
Regular lubrication of suspension and steering joints (weekly/monthly).
Tune Up:
Ignition points, spark plugs, carburetor adjustments recommended annually or as needed.
Engine Oil:
SAE 20W-50 (mineral oil recommended for originality, synthetic can be used with caution regarding seals).
Gearbox Oil:
EP 90 GL-4 gear oil.
Rear Axle Oil:
EP 90 GL-5 gear oil (non-limited slip differential).
Brake Fluid:
DOT 3 or DOT 4 (ensure compatibility, typically glycol-based).
Coolant:
50/50 mix of ethylene glycol antifreeze and distilled water.
Engine Oil Leaks:
Common with age; crankshaft seals, rocker cover gaskets, sump gaskets.
Moss Gearbox Issues:
Can be 'grindy' when downshifting; synchro rings wear.
Chassis Corrosion:
Body-on-chassis construction can lead to rust, especially in sills, wheel arches, and floor pans.
Kingpin Wear:
Front suspension kingpins can wear, leading to steering looseness and shimmy.
Electrical Gremlins:
Aging wiring harnesses, connections, and components can cause intermittent faults.
Manufacturer:
Standard-Triumph Motor Company, later part of British Leyland.
Motorsport Connection:
Triumph TR series has a strong heritage in rallying and circuit racing, including Le Mans.
Tr2:
Launched 1953, rugged chassis, basic features, established the 'TR' lineage.
Tr3:
Launched 1955, significant upgrade with front disc brakes, more powerful engine options, revised interior.
Tr3A:
Launched 1957, updated grille treatment, improved engine and chassis components, increased production.
Tr4:
Launched 1961, completely new Michelotti-styled body, independent rear suspension (IRS) optional, larger engine, rack-and-pinion steering.
Total Production Approx:
TR2: ~8,600; TR3: ~15,400; TR3A: ~11,500; TR4: ~40,250 (cumulative for the series is over 75,000 units).
Manufacturing Location:
Coventry, England.
