Lot 8159-DFW: 1973 MG B Roadster

The 1973 MG B Roadster is actually a really solid little classic! According to UK MOT statistics, these cars have 111 faults per 100 tests—17% better than the average 1973 car. Not bad for a 50+ year old roadster! Still, there are a few areas to keep an eye on:

Rust is your #1 enemy

Rust is the MGB’s Achilles’ heel. The “lower 10 inches” of the car need special attention:

• Sills (rocker panels) – notoriously prone to rust; sill covers can hide problems
• Floor pans – rust loves to hide under that cozy carpet
• Rear wheel arches – another favorite corrosion spot
• Scuttle panel – traps water and debris
• Suspension mounting points – structural and critical
• Boot/trunk floor – often overlooked

Don’t be fooled by shiny paint—MGBs are famous for hiding rust beneath pretty exteriors. The car you’re looking at has an “Original & Highly Original” status, so I’d definitely want to check underneath!

Electrical quirks (aka “Lucas, Prince of Darkness”)

More problems crop up with electrics on these cars than anything else! Common gremlins include:

• Charging system faults – generators and voltage regulators need attention
• Battery drain when parked
• Cutting out at low revs – often electrical in nature
• The “three switches that always work” are usually fine, but everything else is… British

Engine & oil pressure

Your 1973 has the desirable 5-main bearing engine (upgraded from the earlier 3-main), which is notably more durable. Still watch for:

• Oil pressure dropping at hot idle – 20-30 PSI at idle when warm is common; below that warrants investigation
• The gauge line can also leak—ask anyone about the “mysterious oil puddle under the car”!
• Overheating – make sure the cooling system is in good shape

Other things to check

• Suspension bushes – they’ll age and perish
• Differential and rear axle for leaks
• Overdrive (if fitted) – desirable but can be tricky if not used regularly

The good news? Parts are abundant and cheap, the mechanicals are simple enough for a DIYer, and there’s fantastic club support. The 1973 MGB is chrome-bumpered (always a plus) and that 5-bearing engine will soldier on with even basic maintenance.

Want me to help you find some similar MGBs to compare prices, or do you have questions about anything specific on this car?