Bolt breaks into a common BMW N55 engine or quality defects

In November 2013, more than 100 BMW owners in the U.S. reported a sudden loss of power due to a critical issue involving engine bolts. These incidents led many to visit their local BMW 4S dealers for repairs, but instead of resolving the problem, they faced inconsistencies in after-sales service. This situation sparked concerns among car owners, particularly regarding safety and quality. The issue at hand involves the breakage of bolts that connect the engine's intake camshaft adjustment device to the camshaft sprocket. This problem has affected all BMW models equipped with the N55 engine—a 6-cylinder inline engine featuring Valvetronic technology and a turbocharger. Despite being considered one of the top engines by Ward’s Auto, the N55 has repeatedly faced issues with bolt failure, not just in China, but globally. According to reports from "Consumer Report," several owners shared their experiences, stating that even after repairs, the vehicles continued to have problems. One owner, Zhuang Jing, noted that after the repair, his BMW 535i experienced reduced power and oil burning before reaching 3,000 kilometers. The broken bolts, part of the VANOS system, are made of aluminum, which can warp over time and eventually lead to failure. This issue was first highlighted in a 2013 article from Taiwan’s Petroleum Intelligence magazine, which mentioned multiple cases of engine failure linked to the same problem. The affected models included E89, E70, and E7, produced between February and December 2010. Similar problems were also reported in other engines like N51 and N52T. On forums like BIMMERPOST, discussions about this issue date back to 2010. Many users pointed out that the aluminum bolts in the VANOS system were prone to breaking, making it a widespread concern. However, the exact cause of the bolt failure remains unclear, as no official testing has been conducted on the spare parts. Experts like Lin Jian, a senior engineer from Tsinghua University, suggested that driving conditions might play a role. Sudden acceleration or heavy load could potentially cause the bolts to break. Despite this, BMW claims the issue is not a safety hazard, stating that warning lights would alert drivers if the bolts were about to fail. BMW has since taken steps to address the issue, offering free replacement of the camshaft adjustment device at 4S centers. Although there is no formal recall, the company has been proactively contacting customers. According to Bi Suwen, a spokesperson for BMW, the company has submitted a recall application to AQSIQ, but no mandatory recall has been issued yet. With over 400,000 vehicles sold in China in 2013, the exact number of affected cars remains unclear. However, BMW encourages all owners to visit their local dealer for inspection and free replacement if they are concerned about the issue. While the problem may not pose an immediate danger, it continues to raise questions about transparency and consumer rights.

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