Accessory Drive Belt Replacement Guide for the 1987 BMW L6
Keep your classic E24 6-Series running reliably by understanding its essential V-belt system.
- The 1987 L6 uses three separate V-belts, not a single serpentine belt; identify which belt needs service or replace them all as a set.
- Before replacing belts, inspect for and repair common M30 engine oil leaks from above, as oil contamination will ruin new belts.
- Continental is an OEM-quality choice, Gates is a premium aftermarket option, and Dayco is a reliable budget-friendly brand.
- A broken water pump belt will cause rapid overheating; if the temperature gauge spikes, pull over and shut off the engine immediately.
Signs of a Failing Accessory Drive Belt
A worn-out drive belt on your L6 will give you several warning signs. Ignoring them can lead to a breakdown and more expensive repairs. Be alert for the following symptoms:
- Squealing or Chirping Noises: This is the most common sign of a problem. A high-pitched squeal, especially when starting the engine or accelerating, usually means a belt is loose, worn, or contaminated with fluids like oil or coolant.
- Visible Wear and Tear: A visual inspection can reveal a lot. Look for cracks, fraying, glazing (a shiny surface), or missing chunks on the belts. Any visible damage means it's time for a replacement.
- Accessory Malfunctions: If your battery light comes on, your power steering feels heavy, or the A/C stops blowing cold air, the belt responsible for that component may have failed or is slipping badly.
- Engine Overheating: This is a critical symptom. If the belt that drives the water pump breaks, the engine's coolant will stop circulating, causing it to overheat very quickly. If you see the temperature gauge rising rapidly, pull over immediately to prevent severe engine damage.
Oil Leaks Will Destroy New Belts
The M30 engine in your L6 is known to develop oil leaks from the valve cover gasket or front engine seals over time. Oil dripping onto the rubber belts will cause them to soften, swell, and fail prematurely. Before installing new belts, inspect the area above them for any signs of oil leaks and repair them first.
Choosing the Right Aftermarket Accessory Drive Belt
For your 1987 L6, you have several excellent aftermarket belt options that provide great quality and value. Since your car has multiple belts, you can replace just the failed one, but it is often best practice to replace them all at the same time, especially if you don't know how old they are.
Brand Quality Tiers
- Tier 1: OEM-Equivalent (Continental): Continental is a well-regarded brand that is often the Original Equipment Manufacturer (OEM) for BMW. Choosing a Continental belt means you are getting the same quality as the part from the dealership, ensuring a perfect fit and long service life.
- Tier 2: Premium Aftermarket (Gates): Gates is a top-tier aftermarket brand known for producing high-quality belts that meet or exceed OEM specifications. Many professional mechanics and enthusiasts trust Gates for its reliability and durability.
- Tier 3: Standard Aftermarket (Dayco): Dayco offers reliable, standard-quality belts that are a good budget-friendly option. While some users prefer the longevity of Continental or Gates, Dayco belts perform well and meet industry standards for durability.
Pro Tip: Check Pulleys and Tensioners
While replacing the belts, spin each accessory pulley by hand. They should spin smoothly and quietly. Any roughness, wobble, or grinding noise indicates a failing bearing in the pulley or the accessory itself, which should be addressed to prevent damage to the new belt.
Cost to Replace 1987 BMW L6 Accessory Drive Belts
| Part Category | Estimated Cost Range (Per Belt) |
|---|---|
| New Aftermarket Belts | $7.35 - $38.25 |
| New OEM Belts | $15 - $50 |
| Shop Labor | $150 - $400 |
Cost estimates are for the US market and may vary by location and supplier. The 1987 L6 requires three separate belts.
Frequently Asked Questions (FAQ)
How many drive belts does the 1987 BMW L6 have?
The 1987 BMW L6 uses a multi-belt system, typically with three separate V-belts. One belt runs the alternator and water pump, another runs the power steering pump, and the third runs the A/C compressor. It does not have a single serpentine belt.
How often should I replace the drive belts?
Accessory drive belts on a BMW should generally be inspected at every oil change and replaced every 60,000 to 100,000 miles, or every 5 years, whichever comes first. However, due to the age of the vehicle, it's more important to replace them based on their condition (cracks, noise, etc.) rather than mileage alone.
Can I replace just one of the belts?
Yes, you can replace only the belt that has failed. However, all the belts are exposed to the same conditions and age at a similar rate. It is considered best practice to replace all three belts at the same time for peace of mind and to save on future labor costs.
Is replacing the accessory belts a difficult DIY job?
For a moderately experienced DIYer, this job is very achievable. It requires basic hand tools to loosen the accessories and adjust tension. The belts must be removed from front to back, which can be tedious. If you are not comfortable with this, a qualified independent mechanic can perform the service in 1-2 hours.
Technical Specifications
OEM Part Numbers: 11511711091 64551722991 32421706597
System Type: Multiple V-Belt (3 Belts Total)
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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.
- BMW L6: