Accessory Drive Belt Guide for 1968-1979 MG Midget
Keep your classic MG running cool and charging properly with the right fan belt.
- A squealing noise is the most common sign of a failing accessory drive belt and should not be ignored.
- A broken belt will cause the engine to overheat quickly, so pull over immediately if it fails.
- Verify the correct belt length for your specific car; sizing can vary between years and models.
- Both Dayco and Gates are reputable aftermarket brands that offer reliable performance for your Midget.
Understanding the Accessory Drive Belt in Your MG Midget
On your 1968-1979 MG Midget, the accessory drive belt is a simple V-belt that plays a huge role. It takes power from the engine's spinning crankshaft and uses it to turn the water pump and the alternator. Without it, your engine would quickly overheat, and your battery would not charge, leaving you stranded. Because these cars are from a simpler era of motoring, checking the belt's condition and tension is a key part of regular maintenance.
Symptoms of a Failing Accessory Drive Belt
A failing belt will usually give you a few warning signs. Ignoring them can lead to a snapped belt and serious engine problems from overheating.
- Squealing Noises: A high-pitched squeal from the engine bay, especially when you start the car or rev the engine, is the most common symptom. This is often caused by a loose or worn belt slipping on the pulleys.
- Battery Warning Light: If the belt is slipping badly or breaks, the alternator will stop spinning, and the red battery or ignition light on your dashboard will illuminate.
- Engine Overheating: If the belt isn't turning the water pump correctly, coolant won't circulate. This will cause the engine's temperature to rise quickly, which can lead to severe engine damage.
- Visible Wear: Look at the belt itself. Cracks, fraying, glazing (a shiny, smooth appearance), or missing chunks are all signs that the belt needs to be replaced immediately.
Critical Failure Warning
If your accessory drive belt breaks completely, your water pump and alternator will stop working instantly. Pull over immediately and shut off the engine to prevent catastrophic overheating and damage.
Choosing the Right Aftermarket Belt
For a classic like the MG Midget, the concept of "OEM" is different. The original parts are no longer made by British Leyland. Today, reputable aftermarket brands like Dayco and Gates are the standard for replacement parts and are known to produce quality belts. The most important factor is getting the correct size for your specific year and engine configuration.
Pro Tip: MG Midgets, especially over their long production run, had variations in pulleys and accessories. It's a common issue for owners to buy a belt that's slightly too long or too short. If you're unsure, measure your old belt or check part numbers with a trusted supplier for your specific model year.
Brand Quality
Both Dayco and Gates are well-regarded manufacturers that supply parts to many car makers. Forum discussions among car enthusiasts show that both brands are considered reliable choices for accessory belts. You can confidently choose either brand based on price and availability.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Dayco, Gates) | $2.56 - $27.98 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
How often should I replace my MG Midget's fan belt?
It's good practice to inspect the belt at every oil change and replace it every few years as preventative maintenance, or immediately if you see signs of wear like cracking or fraying. Modern EPDM rubber belts last longer than the original neoprene ones.
Why is my new belt squealing?
If a new belt is squealing, it's almost always due to incorrect tension (too loose) or contamination from oil or coolant on the pulleys. Ensure the pulleys are clean and dry before installation and that the belt is tensioned correctly—you should be able to press it down about half an inch on its longest run.
Are there any recalls for the MG Midget accessory belt?
No. There are no NHTSA recalls or manufacturer Technical Service Bulletins (TSBs) for the accessory drive belt on a 1968-1979 MG Midget. Any known issues are based on community knowledge from owners and mechanics.
Is replacing the fan belt a DIY job?
Yes, this is a very common and straightforward DIY job for an MG Midget owner. It typically requires only basic hand tools to loosen the alternator, slip the old belt off, and install the new one. It's an excellent task for learning basic maintenance on your classic car.
Technical Specifications
OEM Part Numbers: CHA328 GCB11113 SVB101113
The MG Midget uses a standard V-belt. The exact length varies by year and equipment (e.g., with or without an air pump). Common lengths include 813mm and others, so it is critical to verify the correct part for your specific vehicle.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.