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MG MGB Engine ReplacementRebuilt & Performance Options Available

Get quotes from trusted UK MG MGB engine specialists. Compare rebuilt and performance reconditioned prices for 18V and B-Series - 1.8L straight-4 covered. Find UK performance engine specialists.

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MG MGB B-Series engine replacement - 18G 18V rebuilt reconditioned UK
MG MGB B-Series Engines- from £2,450 to £4,800

Rebuilt units from £2,450

Common codes: 18G, 18V, 18GK, 18V-Z

MG MGB GT V8 engine replacement - 35S4 35SD rebuilt reconditioned UK specialist
MG MGB GT V8 Engines- from £4,200 to £8,500

Rebuilt units from £4,200

Common codes: 35S4

MG MGB late-model B-Series engine replacement - 18V-Z 18GK rebuilt reconditioned UK
MG MGB Emissions-Compliant Engines- from £2,650 to £5,100

Rebuilt units from £2,650

Common codes: 18V-Z

MG MGB engine replacement UK - compare reconditioned and rebuilt engine prices
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Instant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialists
How It Works

3 Simple Stepsto Finding the Best MG B Replacement Engine

12-Month Warranty
Supply & Fit Available
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Most replacements completed within 3-5 days.

Engine Intelligence

MG MGB Engines - Codes, Common Failures & Replacement Costs

The cards below cover the main engines fitted to the MG MGB in the UK, including documented failure causes, variant production years, and typical rebuilt engine costs based on current UK market data for classic car restorations.

MG B engine intelligence reference

18V

Production History

  • MG MGB Roadster (1968-1980)
  • MG MGB GT (1968-1980)
  • MG MGB Limited Edition (1979)
  • MG MGB Rubber Bumper models (1974-1980)

Known Failures

  • Rear main seal oil leaks - common after 60k miles, causes oil pooling under engine bay.
  • Cooling system overheating - aged radiators and water pumps fail, leading to head gasket stress.
  • Bearing wear at high mileage - main and big-end bearings degrade, causing knocking noises.

Specs

Petrol · 1.8L · 95-98hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £2,450-£4,200 (supply only)

18G

Production History

  • MG MGB Roadster (1962-1967)
  • MG MGB GT (1965-1967)
  • MG MGB Chrome Bumper models (1962-1974)

Known Failures

  • Rocker cover gasket leaks - top-end oil seepage common on early B-Series units.
  • Timing chain tensioner wear - rattling noise at idle, requires preventative replacement.
  • Cylinder bore wear - low compression on high-mileage examples without rebuild history.

Specs

Petrol · 1.8L · 95hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £2,650-£4,500 (supply only)

35S4

Production History

  • MG MGB GT V8 (1973-1976)

Known Failures

  • Aluminium block cooling issues - overheating if radiator or water pump not upgraded.
  • Fuel system component wear - SU carburettors require specialist calibration for reliability.
  • Oil seal degradation - V8-specific seals fail earlier than B-Series equivalents.

Specs

Petrol · 3.5L · 137hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £4,200-£8,500 (supply only) Estimated from comparable Rover 3.5L units - actual quotes may vary.

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Variants We Cover

MG MGB Engine ReplacementAll Variants Covered

Not sure which variant your MG MGB is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.

Engine Codes

MG MGB Engine Codes

Every engine code fitted to the MG MGB across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.

Petrol Engines

Extracted from detailed petrol and performance engine families across MG B variants.

Can't find your engine code-

Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK MG MGB engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.

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Common Problems

MG MGB Engine Problems

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Save vs Main Dealer Price

Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific MG MGB and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.

Replacement Engine Options

MG MGB Replacement Engine Types

Every MG MGB engine type is available through our UK network with typical price ranges based on variant, engine code and budget.

MG MGB Refurbished EnginesMid-tier refurbishment addressing key wear items while retaining original components where still serviceable.
Typical Price
£2,100 - £3,900
(supply only)
View refurbished MG MGB engine options
Refurbished

Refurbished MG MGB engines balance cost and reliability by replacing critical wear components while retaining serviceable original parts.

  • Key seals, gaskets and bearings replaced to prevent common failures
  • Compression and oil pressure tested before dispatch to specialists
  • Suitable for drivers prioritising reliability over concours originality
Typical Price
£2,100 - £3,900
(supply only)
View refurbished MG MGB engine options

All rebuilt engines include a minimum 12-month warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific MG MGB within hours.

Engine Sizes

MG MGB Engines by SizeFind the Right Displacement for Your Variant

Every displacement fitted to the MG MGB is listed below, with compatible engine codes, production years and common failure notes to help identify your replacement engine.

The 1.8L B-Series inline-four powered over 90% of MGB Roadsters and GTs from 1962-1980, offering simple OHV design, reliable torque and widespread parts availability for classic restorations across chrome and rubber bumper eras.

ENGINE CODE(S)18G, 18GA, 18GB, 18GD, 18GE, 18GF, 18GG, 18GH, 18GJ, 18GK, 18V, 18V-Z
COMPATIBLE MODELS (UK)Roadster (1962-1980), GT (1965-1980), Limited Edition (1979), Chrome Bumper (pre-1974), Rubber Bumper
PRODUCTION YEARSpost-1974
Common Failure Points

Rear main seal oil leaks, cooling system overheating, bearing wear at high mileage

Compare MG MGB 1.8L petrol engine prices

Not sure which engine size your MG MGB needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK MG MGB specialists.

Fuel Type

MG MGB Engines by Fuel Type

Choose your MG MGB engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early 18G B-Series to the specialist Rover 3.5L V8.

All MG MGB models were petrol-powered, dominated by the 1.8L B-Series inline-four with the rare 3.5L Rover V8 reserved for the GT V8 performance variant.

Common MG MGB Petrol Engine Families
18G/18V B-Series
most common replacement engine (Roadster/GT), oil leak and overheating risks
18V-Z emissions B-Series
late-model rubber bumper variants, carburettor calibration sensitivity
35S4/35SD Rover V8
GT V8 specialist units, aluminium block cooling considerations
Found In
MGB Roadster (1962-1980)
18G (early), 18V (late)
MGB GT (1965-1980)
18G/18V, 35S4/35SD (V8 models)
MGB GT V8 (1973-1976)
35S4/35SD Rover 3.5L aluminium
Known For
Simple OHV B-Series design with excellent parts availability for classic restorations
Rear main seal and cooling system failures dominate high-mileage replacement enquiries
Rover V8 GT models command premium pricing but require specialist V8 expertise
Typical Petrol Models
Roadster (Chrome Bumper)Roadster (Rubber Bumper)GT (Chrome Bumper)GT (Rubber Bumper)GT V8Limited Edition (1979)
Compare MG MGB Petrol engine prices

Not sure which fuel type your MG MGB has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK MG MGB specialists.

Engine Years

MG MGB Engines by YearWhat Was Fitted & When

This section covers all major engine changes across the MG MGB's 1962-1980 production timeline, organised so classic car owners can quickly identify their engine and compare rebuilt prices from UK specialists.

1962 - 1967 - Early Chrome Bumper MGB
Major Platform Change
Launch years of the MGB Roadster and GT, featuring the original 18G B-Series engine with simple OHV design and chrome bumper styling.
Key Changes
MGB Roadster launched (1962) with 18G B-Series 1.8L petrol engine
MGB GT coupe variant introduced (1965) sharing the 18G powerplant
Original cork rear main seal design and composite head gasket specification
Known For
Simple, robust B-Series design with excellent parts availability today
Rocker cover and rear main seal oil leaks common on high-mileage examples
Chrome bumper styling highly prized by concours restoration enthusiasts
Main Engines
18G - 1.8L petrol (Roadster 1962-1967, GT 1965-1967)
Engine Codes Covered
18G18GA18GB
Popular Models
MG Roadster (1962-1967)
MG GT (1965-1967)
Common Replacement Enquiries
MG MGB 18G engine replacement
MG MGB chrome bumper oil leak fix
MG MGB early model bearing wear
Get quotes for 1962-1967 MG MGB replacement engines
FAQ

MG MGB Engine ReplacementFrequently Asked Questions

How much does an MG MGB engine replacement cost in the UK-

MG MGB engine replacement costs from £2,450 for a reconditioned B-Series unit to £8,500 for a specialist Rover V8 rebuild. Get your personalised classic car quote in 60 seconds through our UK specialist network.

  • B-Series 1.8L engines: £2,450-£4,500 rebuilt supply only
  • Rover V8 3.5L engines: £4,200-£8,500 specialist rebuild
  • Supply & fit labour adds £800-£1,800 depending on garage
Compare MG MGB engine replacement prices from UK specialists

What is the most common MG MGB engine code-

The 18V B-Series (1968-1980) is the most common MG MGB engine code, fitted to late-production Roadsters and GTs. Verify your code on the engine block plate near the distributor before ordering a replacement.

  • 18V powered over 60% of all MGBs produced
  • Compatible with both Roadster and GT body styles
  • Rebuilt units include upgraded seals addressing common oil leaks
Check your MG MGB engine code compatibility free before ordering

Will a reconditioned MG MGB engine fit my classic car-

All MG MGB reconditioned engines are verified against your engine code and chassis number for guaranteed compatibility. If it doesn't fit, we cover return costs for your classic restoration project.

  • DVLA registration lookup confirms exact variant and engine code
  • Specialists verify mounting points and ancillary compatibility
  • 12-month warranty covers fitment issues from supplier error
Get quotes for MG MGB engine replacement with compatibility guarantee

How long does an MG MGB engine replacement take-

Most MG MGB engine replacements are completed in 5-10 working days from quote acceptance. Classic restoration work requires careful attention to detail and specialist fitting procedures.

  • Engine supply typically 2-4 days from UK specialist stock
  • Specialist fitting adds 1-3 days depending on garage schedule
  • Commissioning includes timing, carb calibration and road test
Book MG MGB engine supply & fit at a classic specialist near you

What warranty comes with a reconditioned MG MGB engine-

All MG MGB reconditioned engines include a minimum 12-month classic car warranty with mileage limits appropriate for vintage use, extendable to 24 months for touring enthusiasts.

  • Unlimited mileage warranty available for classic touring use
  • Warranty covers parts and labour at any UK specialist garage
  • Extended terms available for concours restoration projects
Compare MG MGB reconditioned engine warranties side-by-side

Can I replace my MG MGB engine with a different B-Series code-

MG MGB engine swaps between 18G/18V B-Series codes are generally compatible but require verification of mounting points and ancillaries. Contact our classic specialists for compatibility advice before ordering.

  • 18G to 18V swaps usually straightforward with minor adaptations
  • Emissions-compliant 18V-Z may need carburettor recalibration
  • Specialist verification prevents costly compatibility issues
Speak to an MG MGB B-Series specialist about engine code compatibility

Is a used MG MGB engine better value than reconditioned-

Used MG MGB engines can save £300-£600 but carry higher risk of hidden wear. Reconditioned units include warranty and critical upgrades for peace of mind on classic restoration projects.

  • Used engines: £1,200-£2,800 but variable condition
  • Reconditioned: £2,450-£4,500 with warranty and upgrades
  • Consider total cost of ownership, not just purchase price
Compare used vs reconditioned MG MGB engine value for your project

How do I find my MG MGB engine code-

Your MG MGB engine code is stamped on the engine block near the distributor. See our photo guide or enter your chassis number to decode your B-Series engine code instantly.

  • Code plate location: engine block, distributor side
  • Common codes: 18G (early), 18V (late), 35S4 (V8)
  • DVLA lookup confirms code from registration number
Find your MG MGB engine code using our free compatibility tool

Will an MG MGB engine replacement affect my classic car insurance-

Notify your classic car insurer of your MG MGB engine replacement. Reconditioned units maintain original engine codes, minimising impact on agreed value policies for vintage vehicles.

  • Most insurers require notification of engine replacement
  • Rebuilt engines with original codes preserve agreed value
  • Specialist insurers understand classic restoration requirements
Get MG MGB engine replacement quotes with insurance documentation

Can I finance my MG MGB engine restoration-

Yes - spread the cost of your MG MGB engine restoration with 0% APR payment plans, subject to status. Apply at checkout for classic car project financing options.

  • 0% APR options available for qualified applicants
  • Flexible terms from 6-24 months for restoration budgets
  • Instant decision at quote stage, no impact on credit score
Explore MG MGB engine replacement finance options at checkout

Why Choose Us

Why UK MG MGB Owners Trust EngineMarket

Join thousands of UK drivers who compare MG MGB engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12-month unlimited mileage warranty and nationwide delivery.

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Every garage and engine rebuilder in our network is vetted, rated, and reviewed by real MG MGB owners.

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UK Engine Replacement Services for MG MGB

Covering every variant from chrome bumper to GT V8, with supply-only or full supply & fit available nationwide.

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