Introduction:
High-mileage German performance cars, such as the BMW M5, are not typically known for their reliability. The F10, the first twin-turbo V-8-powered M5, has its own set of well-known issues that can become catastrophic as mileage accumulates. In a recent teardown video by the I Do Cars YouTube channel, a 4.4-liter V-8 engine from an M5 was examined after suddenly locking up on the highway. Despite the healthy appearance of some components, the cause of the failure was eventually discovered to be a spun crankshaft bearing and severely worn rod bearings. This serves as a warning to BMW M5 owners to address these issues before they lead to costly repairs.
1. Disassembly and Initial Inspection
Under the hood of the BMW M5, the twin-turbocharged S63TU V-8 engine presents a complex challenge for disassembly due to the placement of the turbos and numerous hoses. Despite a slow coolant leak and some imperfections on the camshafts, the turbos and head gaskets are found to be in good condition upon initial inspection. However, the cause of the sudden engine failure remains elusive until further disassembly.
2. Discovery of Damage
As the teardown progresses, metal flakes and larger chunks of debris are discovered in the oil pan, indicating internal issues within the engine. The investigation reveals that one of the crankshaft bearings has spun and fused to the shaft, preventing its removal for closer examination. Additionally, although the rod bearings did not fail, they show significant wear despite the relatively low mileage on the engine.
3. Significance for M5 Owners
The failure of the crankshaft bearing and the excessive wear on the rod bearings serve as a warning to BMW M5 owners about the importance of regular maintenance and potential replacement of these critical components. With just over 100,000 miles on the engine at the time of failure, this case highlights the need for proactive measures to prevent similar catastrophic breakdowns in high-performance vehicles.
4. Cost and Maintenance Considerations
Addressing the potential issues with crankshaft and rod bearings in the BMW M5 can help owners avoid the substantial costs associated with engine repairs and replacements. Routine maintenance and inspection of these components, along with other critical parts, can extend the longevity and reliability of the vehicle, ultimately saving money in the long run.
5. Conclusion
The examination of the BMW M5’s S63TU V-8 engine provides valuable insights into the potential pitfalls of high-mileage performance cars, especially in terms of critical components like crankshaft and rod bearings. By staying proactive and addressing these issues early on, owners can prevent sudden failures and costly repairs, ensuring the continued performance and durability of their vehicles. The case of the failed crankshaft bearing serves as a cautionary tale for BMW M5 enthusiasts, emphasizing the importance of regular maintenance and timely replacement of worn components to avoid similar breakdowns in the future.