TSA ADVISOR

Jul 20

TRA ADVISOR questions should be directed to jwhowland@outlook.com. Here are some common topics:

Here is a bulletized summary of typical questions people commonly have about vintage Triumph TR3 and TR4 cars, categorized for clarity:

🔧 Engine & Performance

Here’s a reference for engine restoration with potential performance upgrades

What are the engine specifications (displacement, horsepower) for TR3 vs TR4?
What type of fuel and oil should I use in a TR3/TR4?
How do I set the valve clearances and timing correctly?
Can I upgrade the camshaft or pistons for better performance?
What's involved in converting to an aluminum flywheel or installing performance carburetors?

🛠️ Maintenance & Repairs

Here’s a document with the basics of maintenance

How often should I change fluids and check valve clearances?
What are common oil leaks and how can I prevent them?
What parts are most prone to wear and failure?
What tools are essential for working on these cars?
Are there specific torque specs for major engine and chassis components?

⚙️ Transmission & Drivetrain

Here’s a handy reference for asking the right questions for gearbox rebuilds….

How do I rebuild or adjust the TR3/TR4 gearbox?
What is the proper clutch replacement procedure?
How can I check for worn synchros or input shaft bearings?
What are common rear differential problems?

🔌 Electrical System

Here’s a handy summary sheet for common electrical issues….

How do I convert from positive ground to negative ground?
What are common issues with Lucas generators and voltage regulators?
How can I add a modern alternator or USB charging port?
What are the wire color codes for TR3/TR4 harnesses?

🔩 Brakes & Suspension

Here’s a handy summary reference your brake and alignment issues…..

What brake upgrades are available (Girling calipers, dual master cylinders)?
How do I rebuild front calipers or adjust rear drums?
What are the benefits of polyurethane bushings?
How do I set the proper front-end alignment?

🔄 Cooling System

Here’s a handy reference for your cooling system repairs….

What’s the best way to flush and refill the cooling system?
Should I convert to an electric fan or aluminum radiator?
What are signs of a failing water pump or clogged radiator?

⛽ Fuel System

Here’s a handy reference for your fuel system repairs and trouble shooting….

What’s the correct jetting for SU or Stromberg carburetors?
How do I fix throttle shaft vacuum leaks?
Are modern fuels with ethanol harmful to my car?
How do I replace old steel fuel lines safely?

🧰 Body & Interior

Here’s a summary reference for common topics for the body of older TRs

How do I fix rust in floor pans, sills, and the rear valance?
What are the best options for interior restoration (dash, seats, trim)?
How do I convert to a modern seatbelt system?
How do I fit a soft top or hardtop correctly?

🔍 Identification & History

Here’s a summary of the basics for ID and model changes for early TRs….

How can I verify the original engine and chassis numbers?
What are the production differences between early and late TR3/TR4 models?
What year is my TR3/TR4 based on VIN or commission number?
What factory options were available (overdrive, wire wheels, etc.)?

🧭 Upgrades & Modifications

Here’s a summary for your reference for potential upgrades….

What are the best performance upgrades for reliability and drivability?
Can I add a 5-speed transmission conversion?
What tire sizes and modern wheels fit without rubbing?
How do I improve lighting (LEDs, halogen conversions)?

🧑‍🔧 Handy TOOL KIT LIST FOR YOUR TRAVELS

Here’s your trunk tool kit list….

Here is a detailed summary comparing the Triumph TR2, TR3, TR3A, TR4, and TR4A, focusing on engine specifications, body features, mechanical differences, and production data. This summary proves basic technical details for the beloved 4 -cylinder Triumphs.

Triumph TR2 to TR4A – Detailed Specifications and Key Differences

|| Model

TR2 (1953–1955)

|TR3 (1955–1957)

|TR3A (1957–1962)

|TR4 (1961–1965)

|TR4A (1965–1967)

📅 Production Summary

Engine and Drivetrain

Chassis and Suspension

Body and Exterior

Interior and Features

Dimensions

| Wheelbase | 88.0 in | Same | Same | 88.0 in | 88.0 in |
| Overall Length | 151 in | 151.5 in | 152 in | 155 in | 155 in |
| Width | 55 in | 55 in | 56 in | 58 in | 58 in |
| Weight (Curb) | ~2000 lbs | ~2050 lbs | ~2100 lbs | ~2150–2200 lbs | ~2250–2300 lbs |

Key Technical & Historical Notes

Model

Notable Features

TR2

First “true” postwar sports car from Triumph. High sills and cut-down doors. Sparse interior. Competed well in early motorsports.

TR3

Minor updates. Optional front disc brakes (from 1956). Improved carbs. Still uses side curtains and curtain-style doors.

TR3A

Largest production run. Introduced wide grille and exterior handles. Better trim, stronger bumpers, and improved electrics. No actual “TR3A” badging from factory.

TR4

Full redesign by Giovanni Michelotti. Introduction of modern features like rack and pinion, roll-up windows, optional hard top (Surrey Top). Much more refined.

TR4A

Upgraded TR4 with Independent Rear Suspension (IRS) on most models in the second half of the last year. Subtle changes to trim, grille, and body shell reinforcements. Stiffer ride and improved handling. Live axle still offered in some export markets.

Collectability and Legacy

Model

Collectability

TR2

High, due to rarity and historical importance. Very basic and raw.

TR3

Less rare than TR2, but disc brake cars are sought after.