2000-2003 BMW M5 Timing Cover: A Guide to the S62's Complex Multi-Piece Assembly
This guide covers the multi-piece timing cover on the S62 V8, focusing on common oil leaks, inspection of used parts, and what to know before starting a replacement.
- The S62 timing cover is a complex three-piece assembly; leaks are common but the main danger is from failing timing chain guides behind the covers.
- A rattling noise from the front of the engine is a critical warning of guide failure and requires immediate attention to avoid catastrophic engine damage.
- Replacement is a 5/5 difficulty job requiring extensive disassembly and special BMW timing tools; it is not feasible for most DIY mechanics.
- When buying a used cover, the most important check is for internal scoring or gouges, which indicates a previous timing chain failure.
Anatomy of the S62 Timing Cover Assembly
Unlike many engines that use a single front cover, the S62 V8 in the 2000-2003 M5 utilizes a complex, multi-part assembly. Understanding these different pieces is critical when diagnosing leaks or purchasing a used replacement. The main components are:
- Lower Timing Case (Part # 11-14-1-407-316): This is the largest piece, forming the main structure at the front of the engine block. It houses the crankshaft seal and provides mounting points for accessories.
- Upper Timing Cover, Bank 2 (Driver's Side, Cylinders 5-8): This cover seals the top of the driver's side cylinder head and timing components. The most common part number is 11-14-7-830-134.
- Upper Timing Cover, Bank 1 (Passenger's Side, Cylinders 1-4): This cover seals the passenger's side. It is identified by part number 11-14-1-407-574.
Each of these components requires its own specific gaskets to seal against the engine block, cylinder heads, and each other. Leaks often develop where these different surfaces meet.
Common Symptoms of a Failing Timing Cover
The most common failure of the timing cover assembly is not the cover itself cracking, but the gaskets and seals deteriorating over time, leading to oil leaks.
- Oil Leaks: This is the number one symptom. Look for oil seeping from the seams between the upper and lower covers, where the covers meet the cylinder heads, or from the bottom where the timing case meets the oil pan.
- Burning Oil Smell: Oil leaking from the timing covers can drip onto hot exhaust components, creating a distinct burning smell in the engine bay or even in the cabin.
- Rattling Noises: A rattling sound, especially on a cold start, is typically not the cover itself but a sign of failing timing chain guides *inside* the cover. This is a critical warning, as broken guide pieces can fall into the oil pan, clog the oil pump pickup, and lead to catastrophic engine failure.
- Metal or Plastic in Engine Oil: If you find bits of plastic or metal shavings in your engine oil during an oil change, it's a strong indicator that the timing chain guides are breaking apart. This requires immediate attention, as the timing covers will need to be removed to replace the guides.
Warning: While oil leaks from the timing cover are common, rattling noises from the front of the engine should be considered a serious issue. A failing timing chain guide can destroy the engine if not addressed promptly.
Buying a Used 2000-2003 M5 Timing Cover: A Buyer's Guide
Since new OEM covers can be expensive or hard to find, a quality used OEM part is often a great value. However, careful inspection is essential.
What to Check Before You Buy:
- Verify the Part Number: Ensure you are buying the correct piece (lower case, upper driver's side, or upper passenger's side) for your needs. Double-check the part numbers: 11141407316 (Lower), 11147830134 (Upper Driver), and 11141407574 (Upper Passenger).
- Inspect for Cracks: Carefully examine the entire cover, especially around bolt holes and mounting bosses. Cracks can form from over-tightening or impact. A cracked cover is unusable.
- Check for Internal Damage: This is the most critical check. Look inside the cover for any deep scratches, scoring, or gouges. This type of damage is a tell-tale sign that a timing chain or guide has failed previously, and the chain was slapping against the inside of the cover. A cover with significant internal scoring should be rejected.
- Examine Mating Surfaces: Lay the cover on a flat surface to check for warping. All gasket surfaces must be perfectly flat and free of deep nicks or corrosion to ensure a proper seal.
- Check Threaded Holes: Make sure all threaded holes, especially those for tensioners and accessories, are clean and not stripped. Repairing stripped threads in aluminum is difficult and costly.
Pro Tip: A used OEM timing cover that passes inspection is almost always a better choice than a new, cheap aftermarket part. The complex shape, precise fit, and material quality of the original BMW part are difficult to replicate, and a poor fit will guarantee leaks.
Replacement and Installation
Replacing the timing covers on an S62 engine is a highly complex and labor-intensive job, best left to experienced technicians or very skilled DIY mechanics. The difficulty is a 5 out of 5.
The procedure is not a simple unbolt-and-replace task. It requires extensive disassembly of the front of the engine, including:
- Draining coolant and oil
- Removing the radiator fan and shroud
- Removing accessory belts and pulleys
- Removing the harmonic balancer
- Removing the water pump
- Removing the VANOS units from the front of the cylinder heads
Specialized BMW timing tools are absolutely required to lock the crankshaft and camshafts in place. Attempting this job without the correct tools will result in incorrect engine timing, which can cause catastrophic engine damage in this interference engine.
Because of the labor involved, it is highly recommended to replace other components "while you're in there." This includes:
- All timing chains, guides, and tensioners
- Water pump and thermostat
- Front crankshaft seal
- All related gaskets and o-rings
Known Issues, TSBs, and Recalls
There are no specific recalls or Technical Service Bulletins (TSBs) for the timing covers themselves on the 2000-2003 BMW M5. However, the vehicle is part of the massive Takata airbag recall. NHTSA has issued a "Do Not Drive" warning for these vehicles until the free recall work is performed, as the old airbag inflators have a high probability of rupturing in a crash. Owners should verify their vehicle's status with a BMW dealer immediately.
Cost Breakdown
The cost of addressing a timing cover issue is dominated by labor due to the complexity of the job. RepairPal estimates the cost for replacing the front cover gaskets on a 2000-2003 M5 to be between $2,221 and $2,975. This cost can increase significantly if the timing chains and guides are also replaced.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Timing Cover (Each, Upper) | $600 - $700 |
| New OEM Timing Cover (Lower) | $400 - $450 |
| Used OEM Timing Cover (Each) | $100 - $200 |
| Gasket Set | $50 - $100 |
| Shop Labor for Gasket Replacement | $1,525 - $2,238 |
Frequently Asked Questions (FAQ)
My timing cover is leaking oil. Can I just replace the gasket?
Yes, in most cases the repair for a leak is to replace the gaskets, not the metal covers themselves. However, the labor involved is the same, as the covers must be removed to access the old gaskets. This is a very labor-intensive job.
I hear a rattling noise from the front of my engine. Is that the timing cover?
The noise is almost certainly not the cover, but the plastic timing chain guides located behind it. This is a very common and serious issue on S62 engines. The plastic guides become brittle with age and break apart, allowing the timing chain to become slack and rattle. This requires immediate attention to prevent engine failure.
Do I need special tools to replace the timing cover?
Yes, absolutely. This job requires a set of BMW-specific timing tools to lock the camshafts and crankshaft at Top Dead Center (TDC). Attempting the job without these tools will lead to incorrect engine timing and likely cause severe engine damage.
What else should I replace while the timing covers are off?
Due to the high labor cost, it is strongly recommended to replace all wear items in the area. This includes all timing chains, plastic guides, and hydraulic tensioners. It is also the perfect time to replace the water pump, thermostat, and front crankshaft seal.
Technical Specifications
OEM Part Numbers: 11141407316 11-14-1-407-316 11147830134 11-14-7-830-134 11141407574 11-14-1-407-574
The S62 timing cover is a three-piece assembly consisting of a lower case and two upper covers (Bank 1 and Bank 2).
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.
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