N55 vanos bolt broken

image Do you notice anything wrong in this picture,,,take a closer look at the intake vanos unit,,,,the intake vanos unit not sitting straight,,,,car got towed in from an auto body shop,,,engine won’t start,,,,engine turned over ,,,,but no start,,,,I noticed when cranking the engine,,,,the engine spun kind of fast,,,,like there was no compression.image You can see the vanos not sitting straight ,,,,and the vanos bolt is sticking out.image Heres the vanos bolt,,,notice the bolt threads are missing,,,the rest of the bolt is stuck inside the intake camshaft,,,,so during the accident the oil cooler got damaged,,,,and all the oil ran out of the engine while it was running,,,so the first thing to go was the intake camshaft locked up inside the cylinder head,,,,breaking away the vanos bolt,,,,I was unable to turn the intake camshaft inside the head.,,,time for a new engine if the insurance company buys it.

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15 Responses to N55 vanos bolt broken

  1. BMW Enthusiast says:

    Hello BMWTechnician. Today my check engine light came on when I started my car. Got the codes 2A7C – VANOS, inlet, cold start and 2A82 – VANOS, intake, variable cam control test. These are the symptoms. The engine has a loud ticking/rattling noise at 700-1500 rpm. It goes away at 1500 RPM and above. When starting the car, the rpm will jump to 1000 RPM once, and then it will go back to normal. This happens every time I start it. I tried changing VANOS Solenoids no help. Heres a link to the rattling sound. The rattle is not as loud in the video. Its a lot louder when I revv it to 1k.

    I appreciate your help!


    • So you replaced both vanos solenoids ,,,,the next thing is to remove the valve cover and check the intake vanos units,,,,that noise could be the vanos unit coming apart,,,,the 4 bolts that hold each vanos unit together sometime break and come apart,,,I have some pictures in my blog


  2. BMW Enthusiast says:

    Thank you for your input! Dropped it off at the dealer today. Told me they have to replace both VANOS units and also drop the oil pan to get the broken bolts. Under warranty thank God. How many hours did this job pay you under warranty? Did they pay you enough to finish?


  3. BMW Enthusiast says:

    Hello BMWTech, when they opened up the valve cover today the said that one of my cylinder head bolts were broken. They told me that while the valve cover is out, they will only charge $275 for the 4 bolts. Is this a common thing on the N51 motor? Or are they just adding up charges?


  4. BMW Enthusiast says:

    Hey BMWTech. So on my 2011 328i Coupe N51 Engine I recently had broken VANOS bolts. They replaced both VANOS actuators and also dropped the oil pan to remove the bolts. Everything runs good now. However, ever since I got the car back from the dealer, the car feels like it has a lot of body roll and does not handle as good. Any idea why? Is it because they did not put things back on properly? Thank you.


    • That’s doesn’t make any sense,,,but they had to drop the front subframe to remove the oil pan,,,,maybe they forgot something on the front end after replacing the oil pan gasket,,,,I don’t know what it could be,,,,,when I do the job I just lower the front subframe with all the suspension component still attached,,,I don’t remove any suspension parts,,,,,maybe have them recheck out the front end for you


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