According to "Consumer Report", since November 2013, more than one hundred BMW owners have suffered a shock from the loss of power of the vehicle. After the fault occurred, these owners went to the 4S shop for repair, but they suffered from the difference of after-sales service (see "The difference between the "Baibao owners" and the 4S shop in the case of engine bolt breaks.
Compared with the dispute over the maintenance price, quality defects and potential safety hazards are more important issues for these BMW owners. The high failure rate has caused some BMW owners to have doubts.
Bolt breaks into a global common problem
Several car owners said in an interview with the "Consumer Report" reporter that there will still be a series of problems after the vehicle is repaired. In this regard, BMW 535i owner Zhuang Jing (a pseudonym) told reporters: "Because the broken pieces of bolts hit the engine, resulting in scratches, after the repair, the vehicle will appear to reduce the power, less than 3,000 kilometers began to burn engine oil. â€
According to the "Consumer Report" reporter, the bolt breakage problem refers to the breakage of the fixing bolt between the engine intake camshaft adjustment device and the intake camshaft sprocket. It involves all BMW models with the N55 engine. The N55 technology is a 6-cylinder in-line engine developed by the BMW Group with a direct injection valve Valvetronic and an exhaust gas turbocharger. This engine is the next generation of the N54 engine, and its technical perfection and improvement make the use of exhaust turbocharger possible.
Although it has been ranked first in the well-known ranking institution for many years, Ward's top ten engine and the mainstay in the power system matched by BMW's mid- to high-end models, the N55 frequently has problems with engine bolt breakage, and this is not mainland China. Unique, suspected of global common problems.
The N55 engine is equipped with BMW's self-developed VANOS system, which is operated by the vehicle engine management system and is a combination of hydraulic and mechanical camshaft control equipment. The broken bolt is the part in the VANOS system.
In the November 2013 issue of Taiwan’s Petroleum Intelligence magazine, BMW’s technical bulletin on VANOS bolt breaks was published. According to the report, there have been at least three major failures in the Taiwan area that caused the engine to fail. The models involved are E89, E70, E7 and other vehicles produced from February 2010 to December 2010, and the faulty engine may not be limited to N55, N51 and N52T have similar problems.
In a foreign forum on BMW's various cars called BIMMERPOST, as early as 2010, there was a discussion on the bolt breakage of BMW engines. One of the netizens said: "The bolts of the VANOS system are made of aluminum, which is easy to warp. And eventually break, this is a common problem."
At present, the reason for the bolt breakage is still unclear because the vehicle spare parts are not tested. In this regard, Lin Jian, a senior engineer in the Department of Automotive Engineering at Tsinghua University, said in an interview with the Consumer Reporter: "The bolt break is related to the driving state of the car at that time. If the owner suddenly exerts force, stepping on the throttle, causing the speed to rise. If the load is too heavy, it may cause a sudden break of the bolt."
BMW: involves the owner to go to the 4S shop for free replacement
In response to the safety risks and quality defects involved in BMW engine bolt breaks, the "Consumer Report" reporter interviewed the relevant person in charge of BMW, with a view to giving the reader a reply.
The power of the car will drop instantly, will it endanger the safe driving? Unlike the concerns of the owner, Bi Suwen, the head of public relations at BMW South District, told reporters: "The breakage of the engine bolts is not a safety issue. When the parts are going to malfunction, the warning lights will light up to remind the owner to drive safely. At this time, the vehicle is powered. The slowdown is also for the safety of the owner." She also called for the car to have more safety awareness.
Regarding the specific cause of this failure, Bi Suwen said: "The specific reasons for the bolt breakage of the N55 engine have been investigated and analyzed by BMW's technical department. There is still no clear reply during the confirmation process."
Recently, online exposure of multiple BMW 4S stores and the faulty owners signed a confidentiality agreement, which makes the owners question BMW in the case of knowing that the engine has safety hazards and quality defects, only to remedy the faulty car owners, but the potential risks The owner of the vehicle has not fulfilled his obligation to inform and resolve in advance.
In this regard, Lin Jian said: "If the company itself has discovered that the car has quality defects, or a hidden danger, and does not disclose the obligation, it will infringe the consumer's right to know." He also said that in addition to issuing announcements, Enterprises can also solve the problem by telling the owners who may have hidden dangers one by one and asking if they are willing to replace the spare parts.
Bi Suwen told reporters that BMW is very concerned about the potential problem of engine bolt breakage, and is also collecting information about the owner and taking relevant measures. “BMW Company has already filed a recall with the AQSIQ for the problem of bolt breakage, and the criteria for recall have to meet the relevant conditions. At present, the AQSIQ’s investigation suggests not to make a mandatory recall,†she said.
"The bolt breakage problem can be solved by replacing the camshaft adjustment device." Bi Suwen said that BMW has solved the problem. "Although there is no legal form of recall, in 2013, BMW began to contact the company." If the customer is worried about the hidden danger of bolt breakage, they are advised to go to the 4S shop for inspection and free replacement."
According to official BMW data, the BMW Group sold more than 400,000 vehicles in China in 2013, and how wide is the range of vehicles involved in engine bolt breaks? The reporter asked Bi Suwen about this question. She said: "At present, the company has not yet calculated the specific information on the models, batches and quantities of bolts with hidden bolts, but all BMW owners can go to 4S stores if they have concerns about this failure. Make a free replacement."
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