It looks like you're new here. If you want to get involved, click one of these buttons!
2006 BMW 525i (N52) possible wide spread defect
I had a recent problem with our 525i. I was driving it and it lost power/died. The car would not restart and no error lights or messages were displayed on the IDrive. I had the car towed home. After the initial check of the vehicle, it showed the crank sensor fault. I noticed a bunch of metal throw off in the oil filter and the vehicle did not have compression in cylinder 2 and 6. I was thinking catastrophic engine failure.
Since I am very familiar with American/Japanese vehicles, I decided to look into the problem myself after getting no response from BMWNA. The car is out of warranty with 85K miles.
The metal throw off was due to the timing chain jumping off of the exhaust cam gear and grinding against the back of it. The cause of the problem was the two aluminum screws under the cam shaft gears. Both heads were broken off and one made its way up the chain getting caught in the chain and gear. These screws are aluminum. I don’t know if this is a common problem but for the bolts to break it would be due over torqued/tighten bolts or extreme pressure from expanding/contracting of the magnesium vs aluminum. I suspect over tightening. The other broken bolt head is still some where in the bottom of the oil pan. The exhaust cam gear was chewed up, but still serviceable. I re-timed the car and checked the compression. I got lucky and compression is good so no bent valves. I disassemble everything and now I patiently waiting for several parts. However, I'm still dealing with the broken head that is some where in the oil pan.
I re-contacted BMWNA and the customer service rep took down some information and stated there was nothing they could or would do for me. She noted my concerns to better service future customers and advised me to take the vehicle to the dealer. I asked to speak to some else and she stated she was only in customer service and no one there could assist me. I'm a bit surprised, because I have always had excellent dealings with BMW. I recall a time when BMWNA representative personally called me to rectify a warranty issue. The dealer did not want to cover the item under CPO. A person from corporate assisted me and earned my loyalty. This is the reason why we currently own 3 BMWs (05 325XI, 06 525i, and 07 335i). I understand car maintenance is a must, but when something is not the fault of the owner should I have to bear the entire cost of the repair. I’m not asking for anything other than consideration or a return call from anyone who has the authority assist me.