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11-06-2017, 07:47 AM | #1 |
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failed head bolt
My wife has an '11 328 and I have a '12 128 and both of these cars are running the N52 motor and both are almost at 90k miles. I had replaced the OFHG on her car a few months back. Doing some maintenance this weekend I found oil near the OFH. As it turns out it was a failed head bolt that's right beside the OFH. Anyone on here dealt with this issue? From the info I'm reading this seems to be a common issue.
Just curious if anyone on this 128 forum has had to deal with head bolt failure. Seems that the aluminum bolts were over torqued from the factory and causes this failure. |
11-07-2017, 08:50 AM | #2 |
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So I wanted to show you what I replaced on the wife's e91. I post this info since the 1 series and the 3 series run the same N52 motor. The pics below show what I had to replace.
This is the failed bolt... This is the replaced bolt. You have to remove the all of the parts covering the engine cover so it can be removed, the airbox and you have to slide the intake out of the way so you can get to the bolt to torque it. I have about 3 hours invested in this repair. One item of note. Make sure you clean out the bolt hole of any oil. If you don't, you'll never get to the 21ft/lb of torque plus 90d of angle torque. I snapped a new bolt in 2 because I didn't clean it out. It's a fairly easy job, just take your time. |
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11-07-2017, 11:28 AM | #3 |
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Use lock tight? Is this the same bolt that seems to cause a lot of problems with other owners? I've seen two cases where the head (or engine?) had to be completely redone because of this.
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11-07-2017, 12:09 PM | #4 | |
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I took the risk not to remove the valve cover for now. Will wait until it starts to leak. From the videos I've seen, it looks to be a pain to replace that gasket with everything you have to remove. |
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11-08-2017, 05:11 AM | #6 |
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Why does BMW spec aluminum bolts? Is there a reason they can’t be replaced with steel fasteners?
On my ‘04 325i the bolts that hold the water pump in the aluminum block are the original steel, I’ve reused them each time I’ve replaced the water pump. The bolts that hold the OFH in the aluminum block are also steel, I reused those too without issue. Last edited by KNS; 11-08-2017 at 05:34 AM.. |
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11-08-2017, 06:14 AM | #7 | |
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Can you list the P/N for this bolt? I wanna pick one up and install it when I put on the 3IM.
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11-10-2017, 06:39 PM | #8 |
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I think there may be a continuity here... same thing happened to me. Just found it today, along with some oil seepage:
Well. That happened. Car runs perfectly fine, though... Guess what I'll be doing when I go in to do the 3-Stage Intake Manifold...
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11-13-2017, 10:55 AM | #9 | |
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11 12 0 392 547 They were $13 at the local stealer, $11 with the BMWCCA discount. ECS and other online places have them for around $8, so I'd go mail order. This comes in a pack of 4 bolts. I used 1 and broke one, so I have one spare left. Of note, make sure you clean out the bolt hole of ANY oil or you'll never the the torque specs and you'll snap it like I did on the first attempt. |
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11-19-2017, 06:27 PM | #10 | |
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11-20-2017, 07:58 AM | #11 | |
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What I didn't include is the dealer stated an additional 45d angle torque. I felt that was over kill on that bolt considering it failed on me. I'm going to assume these are the correct/revised specs for that bolt considering they came from the dealer... |
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11-20-2017, 04:55 PM | #12 | |
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11-15-2020, 07:17 AM | #13 |
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Reviving an old thread but I read yesterday it was 22nm not 30.
I have to say the 22nm when I did it last night felt very snug so I think 30nm is definitely itself overkill and going to break it. |
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11-21-2020, 05:26 PM | #14 | |
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OP was just saying he found it while doing the OFHG, because it is right behind it.
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11-30-2020, 08:56 PM | #15 | ||
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I must have skimmed through it when I was looking for info on the OFHG and just gotten fixed on that. Thanks for the correction |
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