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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52 330i head bolt issue



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      04-04-2012, 01:08 PM   #1
M3TA5IN
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N52 330i head bolt issue

Hey guys, I just wanted you all to know I had the common issue where the head bolt head snaps off due to over torquing at the factory. Apparently this is only common on the 06 models and was fixed the next year but BMW doesn't really notice it. The bolt was right under the oil filter housing.

Anyway, I got BMW to pay the bill out of warrenty. I'm at 70k miles. It took a lot of interaction with the local service adviser and BMWNA, but in the end they paid for it.
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      04-04-2012, 01:26 PM   #2
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N52 Head Bolts

Thanks for the info.
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      04-04-2012, 06:02 PM   #3
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Been there and done that. Although I paid for it myself. There were actually 2 more that were broken under the valve cover.
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      04-04-2012, 08:41 PM   #4
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Quote:
Originally Posted by M3TA5IN View Post
Hey guys, I just wanted you all to know I had the common issue where the head bolt head snaps off due to over torquing at the factory. Apparently this is only common on the 06 models and was fixed the next year but BMW doesn't really notice it. The bolt was right under the oil filter housing.

Anyway, I got BMW to pay the bill out of warrenty. I'm at 70k miles. It took a lot of interaction with the local service adviser and BMWNA, but in the end they paid for it.
Was there an indication that led you to bleive that the bolt was snapped or did you just see that it was snapped? Is the bolt visible without removing anything?
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      04-05-2012, 07:19 AM   #5
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Quote:
Originally Posted by blackbeast06
Quote:
Originally Posted by M3TA5IN View Post
Hey guys, I just wanted you all to know I had the common issue where the head bolt head snaps off due to over torquing at the factory. Apparently this is only common on the 06 models and was fixed the next year but BMW doesn't really notice it. The bolt was right under the oil filter housing.

Anyway, I got BMW to pay the bill out of warrenty. I'm at 70k miles. It took a lot of interaction with the local service adviser and BMWNA, but in the end they paid for it.
Was there an indication that led you to bleive that the bolt was snapped or did you just see that it was snapped? Is the bolt visible without removing anything?
I have a good relationship with my local dealer. I get them to match tischer on parts so in return I get my oil changed there which I like cuz they inspect the car and let me know if anything is wrong. That's how I knew it was snapped.

The one that is most common to snap is visible though, it's right under the oil filter housing. I will take a picture later to show you better. You can clearly see it. The hard part though is sometimes the head snaps off and will sit on the top end right next to it making it look like its actually good, but it's not.
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      04-05-2012, 01:47 PM   #6
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if I had my cylinder head replaced, would I have the newer bolts or the ones from the factory?
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      04-05-2012, 06:48 PM   #7
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if I had my cylinder head replaced, would I have the newer bolts or the ones from the factory?
New ones, they are not reusable.
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      04-05-2012, 06:56 PM   #8
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      04-08-2012, 09:54 PM   #9
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I did my spark plugs this weekend and found my bottom left head bolt snapped. It was clear as day once I removed my engine cover, which can be done after removing the plastic cabin air filter frame. I still have a CPO warranty left and will be bringing this up with my service advisory right away!
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      04-12-2012, 11:12 PM   #10
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i too have a 330i. i didnt know that it was a common issue among 330i's. im going to make sure i check mine out. i think it had one replaced under warranty from a previous owner. great info by the way. does anyone know of any other things i should look out for? my 330i has 66k miles, sports pack, premium pack, xenon adaptives, logic7, idrive, and is a steptronic. under warranty other than the head bolt it also had a steering angle sensor and starter motor replaced. im just out of warranty and decided to go without an extended one. from what ive read the 330i seems to be very reliable. im lookin to keep the car past 100k.
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      04-13-2012, 08:44 PM   #11
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      04-15-2012, 10:17 PM   #12
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This just happens with the original aluminum bolts identified with a blue painted head, there is a new updated aluminum bolts that are forged.
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      08-11-2012, 05:08 PM   #13
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Quote:
Originally Posted by Cisco661 View Post
i too have a 330i. i didnt know that it was a common issue among 330i's. im going to make sure i check mine out. i think it had one replaced under warranty from a previous owner. great info by the way. does anyone know of any other things i should look out for? my 330i has 66k miles, sports pack, premium pack, xenon adaptives, logic7, idrive, and is a steptronic. under warranty other than the head bolt it also had a steering angle sensor and starter motor replaced. im just out of warranty and decided to go without an extended one. from what ive read the 330i seems to be very reliable. im lookin to keep the car past 100k.
This same aluminum head bolt broke on my 06 325i. From some of the forums, the same bolt has broken on other 06 325i also. No immediate problems occured due to the breakage and if it wasn't for the forums, I wouldn't have even known it was broken. I had 47K miles on it when I found the bolt, but it could have been broken for some time. I just replaced the bolt and didn't go to the dealership.
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      01-08-2013, 05:39 PM   #14
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Quote:
Originally Posted by M3TA5IN View Post
Hey guys, I just wanted you all to know I had the common issue where the head bolt head snaps off due to over torquing at the factory. Apparently this is only common on the 06 models and was fixed the next year but BMW doesn't really notice it. The bolt was right under the oil filter housing.

Anyway, I got BMW to pay the bill out of warrenty. I'm at 70k miles. It took a lot of interaction with the local service adviser and BMWNA, but in the end they paid for it.
Any more information on how to get BMWNA to pay for this? I have an 07 with a 10/06 build date and just over 80k miles.
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      01-09-2013, 01:09 AM   #15
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      01-31-2013, 09:59 AM   #16
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Sorry to bring up an old thread but i want to let the world know (or at least BMWNA) that the head bolts they used for 06 models were completely deficient. I had to have a bunch of them replaced at 70k which ofcourse meant me having to fork out $$ for a VCC and HG. I really think they should have had some goodwill since this is a typical issue with 330i e90s. this sort of thing really shouldnt happen so early in life of a $40k+ car.
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