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05-28-2010, 02:31 PM | #1 |
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4 VERY loose screw from the cam shaft looks to be the culprit...
i got lucky... the bolts were loose and threads were stripped... they were close to falling out and causing some real damage. i should have her back tomorrow if all the parts arrive... bolts, seals, as long as they have it apart they are replacing everything they can... phew.
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05-28-2010, 02:51 PM | #2 |
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Oh Shit. ShitMBrown Coupe's problem. Great something else to freak out about. Sounds like we have some warning though with the sound.
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05-28-2010, 02:58 PM | #3 |
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05-28-2010, 03:42 PM | #6 | |
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05-28-2010, 08:06 PM | #7 |
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Wow good thing you were persistent and were able to catch it in time. Can you also ask the dealer or BMWNA what month/year range is afflicted?
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05-28-2010, 09:16 PM | #8 | |
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Quote:
http://forum.e46fanatics.com/showthread.php?t=706206 |
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05-28-2010, 09:41 PM | #9 |
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wow... glad you caught it in time.
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05-29-2010, 06:34 AM | #11 |
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Unlike the engine mount bolt failures, which are unique to the Z4M, these VANOS/cam sprocket problems apparently affected all S54 engines. Since that covers a large number of units, I wonder if anyone associated with BMW service could estimate what percentage of engines had this problem.
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05-29-2010, 07:59 AM | #13 |
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05-29-2010, 10:45 AM | #14 |
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ah man im gettin worried now bout my 06, glad u found and fixed ur problem tho!
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05-29-2010, 11:58 AM | #15 |
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For peace of mind. I've compared the parts diagrams between the n52 and s54 engines and they appear to be different designs. From the reading through the posts on this subject, it appears that only the s54 engines seem to have this problem?
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05-29-2010, 01:11 PM | #16 |
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maybe the issue here is that many of the S54 engines used in the Z4M's were manufactured well in advance of the build date of the car, leftovers from the M3/M3 CSLs. Just a thought as to why some might have updated bolts and some not
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05-29-2010, 01:57 PM | #17 |
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SA just called... good news the noise is gone! bad news is i won't hav e the car for the long weekend. the CEL light came on. apparently the 'cam timing' is off, they said these engines are very sensitive and it can take a couple attempts to get it right. tuesday it is!
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05-29-2010, 04:11 PM | #20 |
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Here is a TSB I found. I guess they need to update it now to include "loose screws":
June 2006 Technical Service SI B 11 05 06 Engine SUBJECT S54 Harsh Metallic Noise from the VANOS Assembly MODEL E46 M3 and E46 M3 convertible - All production years with the S54 engine E36 Z3 M Roadster and E36 Z3 M Coupe - All production years with the S54 engine E85 Z4 M Roadster and E86 Z4 M Coupe - All production years with the S54 engine SITUATION A harsh metallic ringing, knocking noise is heard in the engine speed range of 2800 - 3300 rpm. This is only perceptible when the vehicle is stationary and at operating engine temperature. CAUSE This noise is due to the designed operating clearance between the gear hub and the rotor of the VANOS high-pressure pump. This is a normal acoustic characteristic of this engine and the cause has no effect on the service life of the engine. Therefore, there is no remedy for this noise and NO PARTS are to be changed. WARRANTY Information only.
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05-29-2010, 05:13 PM | #21 | |
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It does not take a couple of times of putting the engine back together and having the ECU tell you it's mistimed, it MIGHT take a few times of setting it and manually cranking it over 1 revolution. Tech either didn't check it or checked it and decided it was "close enough". Theres 2 other people here who have suffered the same idiocy from the dealer.
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05-29-2010, 06:38 PM | #22 | |
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