MGB Seasonal Storage and Recommissioning: A Practical Owner’s Guide

An MGB can remain reliable and enjoyable for many years, but a car that spends part of the year off the road needs more than a cover and a disconnected battery. Storage protects the body, interior, mechanical components and electrical system; recommissioning gives you the opportunity to check that the car is safe before returning to the road.

There is no single correct storage routine for every MGB. A car kept in a dry, ventilated garage needs different precautions from one stored outside, while a car laid up for a few weeks does not need the same preparation as one left unused through an entire winter. The important principles are to keep moisture under control, prevent avoidable deterioration and carry out a methodical inspection before driving.

Decide how long the MGB will be unused

Storage preparation should reflect the expected period of inactivity. For a short pause, cleaning the car, checking the fluid levels and maintaining the battery may be sufficient. For several months, it is sensible to protect the fuel system, tyres, brakes and interior as well.

Before putting the car away, consider where it will be stored and how often it can be inspected. A dry, secure garage is preferable, but a garage that is damp or poorly ventilated can cause corrosion too. Moisture can collect on metal surfaces when temperatures change, particularly if a car is put away wet or covered while still damp.

Prepare the car before storage

Wash, dry and inspect it

Clean the bodywork, wheel arches and underside where practical. Road dirt, salt and mud retain moisture and can accelerate corrosion, particularly around seams, drain points and the underside of the car. Allow the car to dry fully before covering it.

Use the cleaning process as an inspection. Look for bubbling paint, cracked seals, blocked drainage holes, damp carpets and fresh fluid marks. Deal with obvious faults before storage where possible; a small leak or blocked drain is easier to address before the car has been left unused for months.

Do not overlook the hood and hood frame. Remove dirt from the fabric or vinyl using a product suitable for its material, and allow it to dry naturally. Storing a damp hood folded away encourages mildew and unpleasant odours.

Choose a suitable cover

Indoors, a breathable, properly fitted cover can keep dust away without trapping as much moisture as an impermeable sheet. The car should be clean and dry before the cover is fitted, and the cover should not rub against dirty paintwork.

Outdoor storage requires more protection and more frequent inspection. A cover must be designed for outdoor use, secured against wind and supported by a car that is clean and dry. Avoid allowing the cover to flap against the paint or to block ventilation around the underside. A cover alone cannot make an exposed storage location dry or secure.

Change or check the engine oil

Used engine oil contains contaminants and may have absorbed moisture. If the car is due an oil and filter change, carrying it out before storage means the engine is left with fresh lubricant. If the oil has been changed recently, check its level and condition and follow the maintenance approach appropriate to your engine and service history.

Keep the oil level within the marked range on the dipstick. Do not overfill. Inspect around the filter, sump, rocker cover and other joints for signs of leakage.

Consider the fuel system

Petrol changes with age, and stale fuel can contribute to difficult starting and poor running. For longer storage, owners should consider the condition of the fuel already in the tank, the type of fuel system fitted and the recommendations for any fuel stabiliser being used. A stabiliser is not a substitute for a sound fuel system, and it must be used according to its instructions.

Do not fill a tank simply as a matter of habit without considering the condition of the tank, cap, filler neck and ventilation system. Check for leaks and strong fuel smells before storage. Any sign of fuel leakage should be treated as a fault requiring attention, not as a storage issue to ignore.

Protect the battery

Parasitic electrical loads and natural discharge can leave an MGB battery flat during storage. A suitable battery maintainer can help keep a healthy battery charged, provided the charger is appropriate for the battery and used in accordance with its instructions.

If the battery is removed, keep it secure, clean and dry in a suitable location. Disconnecting a battery may affect clocks, radios or other fitted equipment, and it does not remove the need to check the car’s wiring when the battery is reconnected. Before reconnecting, inspect the terminals and cables for looseness, corrosion or damaged insulation.

Protect the tyres

Check the tyres for correct condition, visible damage, cracks and objects in the tread. Inflate them to the appropriate pressure for the car and its intended use. A car left in one position for a long time can develop temporary flat spots or, where deterioration is present, more serious tyre problems.

Moving the car a short distance occasionally can change the contact area, but it should only be done when the storage location is safe and the car is roadworthy. Do not start or move the car merely for a few minutes without allowing it to reach its normal operating condition; short, incomplete runs can leave moisture in the engine and exhaust system.

Never rely on a jack or temporary support that is unsuitable for prolonged storage. If the car is raised, use properly rated axle stands on appropriate support points and prevent the vehicle from being able to move. In many cases, leaving the car on its wheels with suitable tyre pressures is the simpler option.

Release the handbrake where appropriate

A handbrake left applied for an extended period can contribute to the brakes sticking, particularly if moisture is present. If the car is securely parked on level ground, the handbrake can be released and the wheels secured against movement using suitable chocks. Do not release the handbrake unless the car is safely prevented from rolling.

This is also a useful time to inspect the brake fluid level and look for dampness around the master cylinder, pipes, hoses, calipers and rear brake components. A low level or visible leak needs investigation before the car is driven.

Keep moisture and pests under control

Ventilation is valuable, but simply leaving doors or windows open is not always the answer. Openings can admit rain, pests and condensation. The best storage environment is clean, dry and sufficiently ventilated to limit condensation without exposing the car to weather.

Rodents and other pests may be attracted to a quiet, sheltered car. Check the storage area and inspect for nesting material, droppings, chewed wiring or damage to hoses. Do not place loose deterrents where they could be forgotten in the engine bay or passenger compartment. If you use any pest-control product, follow its instructions and keep it away from children, pets and vulnerable parts of the car.

Moisture-absorbing products can be useful in a confined interior, but they need to be checked and replaced before they become saturated. They should complement, not replace, good ventilation and a dry storage space.

Recommissioning an MGB after storage

Recommissioning should be treated as a process rather than a single starting attempt. Before turning the key, inspect the car systematically. A vehicle that was sound when parked may still have developed a flat battery, sticking brake, perished hose or fluid leak while standing.

Begin with a visual inspection

• Remove the cover and look for dampness, corrosion, nesting material and signs of leaks.
• Check beneath the engine, gearbox, rear axle and fuel system for fresh or old fluid marks.
• Inspect coolant hoses, fuel hoses, vacuum hoses and wiring for cracks, softness, chafing or damage.
• Check the drive belts for deterioration and correct tension according to the relevant maintenance instructions.
• Inspect the tyres, including the sidewalls, tread and valve areas.
• Make sure the exhaust is clear and that no obstruction has entered the tailpipe.

Do not assume that an engine is ready to start because it turned over normally at the end of the previous season. Time, temperature and storage conditions can change the condition of seals, hoses, fuel and electrical connections.

Check levels and the battery

Check the engine oil, coolant, brake fluid, clutch fluid if fitted, and any other relevant levels before starting. Use the correct fluid for the system and investigate any unexplained loss. Do not open a hot cooling system.

Clean and tighten the battery connections if necessary, checking polarity before reconnecting. If the battery has been maintained correctly but the starter turns slowly, do not persist with repeated attempts. Establish whether the battery, connections or starter circuit is at fault.

Turn the engine carefully

Once the car has passed its initial checks, start it in a well-ventilated area and be ready to switch it off. Watch for abnormal noises, fuel smells, smoke beyond what might reasonably be expected on start-up, warning lights or fluid leaks. Never run an engine in an enclosed garage without adequate ventilation; exhaust gases are dangerous.

Allow the engine to warm while monitoring the temperature gauge and checking that the cooling system behaves normally. Do not leave the car unattended while it is running. If the engine does not start promptly, avoid flooding it or draining the battery through repeated cranking. Pause, diagnose the cause and use the correct starting procedure for the car’s fuel and ignition arrangement.

Test the brakes before leaving

Apply the brake pedal with the engine running and note whether it feels firm and consistent. A spongy, sinking or unusually hard pedal needs investigation. Look for leaks and check that the brake lights operate.

Before driving on a public road, move the car slowly in a private, safe area if available. Test the brakes gently, listen for scraping or binding and confirm that the car can be stopped in a controlled manner. Surface rust on brake discs may clear with careful use, but persistent noise, pulling, juddering or a wheel that becomes hot indicates a fault rather than normal recommissioning.

Check steering, suspension and controls

Inspect the steering and suspension for damaged components, leaking dampers, loose fasteners and perished rubber parts. Check that the steering moves smoothly and that the wheels point as expected. Operate the lights, indicators, horn, wipers, washers, heater controls and instruments.

Check the clutch operation and select gears with the car stationary. A clutch that will not disengage, a gear that cannot be selected or a control that feels abnormal should be repaired before driving. Also check the doors, bonnet, boot and hood latches; a securely closing panel is an important part of safe use.

Make the first drive short and deliberate

The first journey should be local and uncomplicated, not an immediate long-distance trip. Carry out a final walk-around, take essential contact and safety equipment, and choose a route where you can stop safely if a problem appears.

During the drive, monitor the temperature, oil pressure and charging indications, while paying attention to the steering, brakes, clutch, gearbox and suspension. Avoid high speeds and heavy loads until you know that the car is operating normally. After the drive, park on a clean surface and check again for leaks, overheating, loose components and unusual smells.

Record any work carried out and any issues noticed. A simple storage and recommissioning record can help establish when fluids, tyres, battery checks and safety inspections were completed. It also gives the next inspection a useful starting point.

Common storage mistakes to avoid

• Putting a dirty or wet car under a non-breathable cover.
• Leaving a known fuel, coolant or brake-fluid leak unattended.
• Running the engine for only a few minutes at regular intervals.
• Using a charger that is unsuitable for the battery or leaving connections insecure.
• Releasing the handbrake without ensuring that the car cannot roll.
• Assuming that a car is roadworthy because it was roadworthy when parked.
• Driving away before checking tyres, brakes, lights, fluid levels and steering.
• Starting an engine in an enclosed space without safe ventilation.

Conclusion

Good MGB storage is mainly about controlling moisture, maintaining basic systems and preventing small faults from becoming expensive ones. Good recommissioning is about resisting the temptation to drive immediately and carrying out a calm, structured inspection first. Clean and dry the car, protect the battery and tyres, check for leaks and pests, then test every safety-critical system before the first proper journey. If any fault is unclear, have it assessed before using the car on the road.