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  1. #301
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Uh oh. Do you see what I see? Bad news
    2013-06-26 19.19.53.jpg
    I must not have a good eye - what am I looking for? I can't see anything standout on the bearings. Click here to enlarge

    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Eww bummer. spun rod.
    2013-06-26 19.38.29.jpg

    Another picture. The bearing is "melded" to the rod. (my word for welded/melted)
    2013-06-26 19.38.38.jpg
    That's wild... How often do you see these engines like this? I am guessing you have seen quite a few overall, just curious how common this is on this motor. How close would you say (s)he was to complete failure? Could something like this go 1000s of miles without any symtoms? Now that I think about it - guessing you didn't tear it apart for no reason... What was going on?

    Cool info - +1ed

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    1 out of 1 members liked this post. Yes Reputation No
    FWIW we have never seen this 'forged' OEM N54 piston and we have had 4 super early engines apart in addition to other later engines Click here to enlarge

    They are all cast. Nothing wrong with cast obviously (hi 2JZ)...but upgrading to a quality forged aftermarket piston will be 'much better' for those looking for more reliability at high power levels. I lived through the Supra thing...pushing stock engines got old quickly. Esp since 800hp 'records' came and went in like 4 months, haha. Also, there was a cast vs forged stock piston internet debate in Supraland too, but it was short lived and not as insane as what we see in BM land.

    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    There seems to be some speculation that BMW stopped putting forged pistons in the N54 08 or later. I can neither confirm nor deny this though.

  3. #303
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    Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
    I must not have a good eye - what am I looking for? I can't see anything standout on the bearings. Click here to enlarge



    That's wild... How often do you see these engines like this? I am guessing you have seen quite a few overall, just curious how common this is on this motor. How close would you say (s)he was to complete failure? Could something like this go 1000s of miles without any symtoms? Now that I think about it - guessing you didn't tear it apart for no reason... What was going on?

    Cool info - +1ed


    the black cap is a dead giveaway that the rod got too hot.
    the bearing journal should be (almost) mirror finish, and the bearing should be (almost) solid matte black.
    this one is all scored up.


    I see engines like this once and a while, I deal with some used car lots that buy auction cars.... they keep me on my toes..... cars with no history, no complaint, just broken- and I have to fix em lol
    I'm also on the hunt for engines/core engines all the time for repairs/replacement/resale, so I have a good amount of stuff- especially N62 engines....

    This isn't common, I know the history on this engine- it came from a dealer. This is customer error. It for SURE would be knocking heavily after spinning the rod.
    No, this rod bearing would have been immediate.

    I tore it apart to see what guts were inside, what went wrong, and to get the components out for more R&D with the other engine i tore apart yesterday.
    Click here to enlarge
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  4. #304
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    Click here to enlarge Originally Posted by Mike@VAC Click here to enlarge
    FWIW we have never seen this 'forged' OEM N54 piston and we have had 4 super early engines apart in addition to other later engines Click here to enlarge

    Agreed- with these two early engines, both have the hypereutectic pistons.


    Click here to enlarge
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    3 out of 3 members liked this post. Yes Reputation No
    lol I got neg repped because I informed everyone that the N54 had hypereutectic pistons.....sigh....I have so much more awesome info that I can share.

  6. #306
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    One of the cam bearing ledges is bad. Can you see which one? This bums me out, because they are REALLY expensive to replace.... and they WILL be replaced, because the new owner I'm sure doesn't want to mess with vanos faults Click here to enlarge
    $55~ a ledge + labour doesn't sound too bad to me?

    unless you're talking about a part other than the one called 'cam bearing ledge' haha

    http://www.ecstuning.com/Search/Site...50913/ES18573/
    http://www.ecstuning.com/Search/Site...31224/ES18539/

    ?

    pretty cool post, never seen a spun bearing before. looks nasty >_<
    boop

  7. #307
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    Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
    lol I got neg repped because I informed everyone that the N54 had hypereutectic pistons.....sigh....I have so much more awesome info that I can share.
    i think i tried to pos, and couldn't Click here to enlarge haha

    more info you say?!
    boop

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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    One of the cam bearing ledges is bad. Can you see which one?
    I want to play. It's the left one. You can see the groove where the two half of the ledge bolt together.

    I am curious as well, what makes the cam bearing ledge replacement so costly if you've already got the engine tore down anyway?
    Eppur si muove.

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    Lol, I guess realoem.com needs to update their prices lol

    http://realoem.com/bmw/showparts.do?...11&fg=15&hl=16

    Over $400 bucks! Lol

    I'm breathing a sigh of relief for them being cheap too! I have (potentially) 4 more to look at and/or replace!
    Click here to enlarge
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Lol, I guess realoem.com needs to update their prices lol

    http://realoem.com/bmw/showparts.do?...11&fg=15&hl=16

    Over $400 bucks! Lol

    I'm breathing a sigh of relief for them being cheap too! I have (potentially) 4 more to look at and/or replace!
    Maybe $400 is for all of them??? No clue and don't know how many there are.

  11. #311
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    Click here to enlarge Originally Posted by mycoupe Click here to enlarge
    Maybe $400 is for all of them??? No clue and don't know how many there are.
    There are four of them at ~$50 each.

    Usually what I do is get a part number from RealOEM and then check prices on Tischer and ECS.
    Eppur si muove.

  12. #312
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    Yea, it was grossly off at realoem.
    Click here to enlarge
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  13. #313
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Tore apart another engine today.


    Attachment 31281


    I was able to remove this cassette within 10 minutes of working on it.
    Attachment 31282


    One of the cam bearing ledges is bad. Can you see which one? This bums me out, because they are REALLY expensive to replace.... and they WILL be replaced, because the new owner I'm sure doesn't want to mess with vanos faults Click here to enlarge
    Attachment 31283


    The head is a little gooey, but not super bad.
    Attachment 31284

    Uh oh. Do you see what I see? Bad news Click here to enlarge
    Attachment 31285


    Got the engine tore down. The pistons on this one show 24/06 (IIRC).... so I'm *assuming* this engine is an ultra early 2007 car..... like first engines out there.......
    Attachment 31286


    Eww Click here to enlarge bummer. spun rod.
    Attachment 31287

    Another picture. The bearing is "melded" to the rod. (my word for welded/melted)
    Attachment 31288



    So in any case, the story with this engine was, the turbos blew a seal (go figure! lol), The customer did not care/pay attention to the oil level condition or warnings, and it starved of oil.

    It just spun the bearing a little bit. The crank can be saved very easily. I dont know if it will even need .010 to clean up.

    So, another one tore down to compare stuff. Guess Ill have to dig out the other ones I have/know where they are, and see whats up with those Click here to enlarge
    Hi-quality posting. Very happy you are here.

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    Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
    lol I got neg repped because I informed everyone that the N54 had hypereutectic pistons.....sigh....I have so much more awesome info that I can share.
    You got positive from me. Share it...

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  15. #315
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Lol, I guess realoem.com needs to update their prices lol

    http://realoem.com/bmw/showparts.do?...11&fg=15&hl=16

    Over $400 bucks! Lol

    I'm breathing a sigh of relief for them being cheap too! I have (potentially) 4 more to look at and/or replace!
    that's exactly what i thought happened, because i saw those realOEM prices and went 'WHAT' before checking ECS

    glad it's not as bad as you first thought though lol

    $400 + core charge even. what the hell would you give as a core? :O

    do you get the full cam housing, rather than JUST a bearing set or something?.. the ECS pictures show the full housing :/

    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    There are four of them at ~$50 each.

    Usually what I do is get a part number from RealOEM and then check prices on Tischer and ECS.
    4 as in 2 for intake, 2 for exhaust... or 4 for intake, 4 for exhaust?
    Last edited by Flinchy; 06-27-2013 at 08:03 PM.
    boop

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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    that's exactly what i thought happened, because i saw those realOEM prices and went 'WHAT' before checking ECS

    glad it's not as bad as you first thought though lol

    $400 + core charge even. what the hell would you give as a core? :O

    maybe it means that full cradle?.. which doesn't make sense as i then can't find that as a separate part (simply comes with the head, not separate, normally?)



    4 as in 2 for intake, 2 for exhaust... or 4 for intake, 4 for exhaust?
    4 total per head.
    Eppur si muove.

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    No, I don't think they are 4. 2 part numbers, when they come to you, they are clam shells that are machined together.

    if not they would have 4 part numbers.
    plus you need special jigs to put them together.. Good thing I have all that crap Click here to enlarge
    Click here to enlarge
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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    4 total per head.
    had another search, it says '335i Sedan. Required: 1' etc. for each of the two part numbers... ​so just one?
    boop

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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    No, I don't think they are 4. 2 part numbers, when they come to you, they are clam shells that are machined together.

    if not they would have 4 part numbers.
    plus you need special jigs to put them together.. Good thing I have all that crap Click here to enlarge
    are they separate little bearing rings you have to press into the housing, or are they the full thing all assembled already?
    boop

  20. #320
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    No, I don't think they are 4. 2 part numbers, when they come to you, they are clam shells that are machined together.

    if not they would have 4 part numbers
    OK, It makes sense that they are machined together, and I guess you order then as a set, but there are still four parts. I was just unaware of how they were packaged.

    If you look at ECS, you can definitely see they come as a set.

    http://www.ecstuning.com/BMW-E90-335..._Head/ES18573/
    http://www.ecstuning.com/BMW-E90-335..._Head/ES18539/
    Eppur si muove.

  21. #321
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    are they separate little bearing rings you have to press into the housing, or are they the full thing all assembled already?
    I do not believe there are bearings for each cam journal.
    Eppur si muove.

  22. #322
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    had another search, it says '335i Sedan. Required: 1' etc. for each of the two part numbers... ​so just one?

    Correct. One intake, one exhaust. 4 total parts, but two part numbers. Clear as mud now? Lol

    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    are they separate little bearing rings you have to press into the housing, or are they the full thing all assembled already?

    kinda. The cam trays go around the cams. They keep em in one spot. The bearing ledges are the rings that create the grooves. They go around the cams and seal the oil the head provides via Vanos soleoids.. it in turn goes into the cam (hollow at the front) and it goes into the vanos assembly. They have a little hook that grabs each other, and they are kind of like piston ring material, very easy to break.


    when they wear the grooves, the oil is not diverted correctly, and the target cam position vs. the actual cam position isn't reached quickly enough, or at all...... Causing the check engine light and rough running.

    I'm estimating I've done about 20-30cylinder heads, and a LEAST 100 cam bearing ledges/cam trays/lifters for for Vanos and lifter tick on the NG6 engines..... But those were all at the dealer, and you just ask for the crap via parts request.... And magically it shows up on the counter, so you don't really know the part numbers.

    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    OK, It makes sense that they are machined together, and I guess you order then as a set, but there are still four parts. I was just unaware of how they were packaged.

    If you look at ECS, you can definitely see they come as a set.

    http://www.ecstuning.com/BMW-E90-335..._Head/ES18573/
    http://www.ecstuning.com/BMW-E90-335..._Head/ES18539/

    Correct. Upper/lower trays, intake and exhaust.

    like I said, this is just another thing that needs a special tool that you BETTER make sure whomever is doing the repair is USING it. If not, the cams are not sitting squarely in the bearing provisions in the cam trays.
    Click here to enlarge
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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    I do not believe there are bearings for each cam journal.

    No, the journals for the cams are machined into the trays..... Just like M54's, M/S5X engines.
    Click here to enlarge
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Correct. One intake, one exhaust. 4 total parts, but two part numbers. Clear as mud now? Lol




    kinda. The cam trays go around the cams. They keep em in one spot. The bearing ledges are the rings that create the grooves. They go around the cams and seal the oil the head provides via Vanos soleoids.. it in turn goes into the cam (hollow at the front) and it goes into the vanos assembly. They have a little hook that grabs each other, and they are kind of like piston ring material, very easy to break.


    when they wear the grooves, the oil is not diverted correctly, and the target cam position vs. the actual cam position isn't reached quickly enough, or at all...... Causing the check engine light and rough running.

    I'm estimating I've done about 20-30cylinder heads, and a LEAST 100 cam bearing ledges/cam trays/lifters for for Vanos and lifter tick on the NG6 engines..... But those were all at the dealer, and you just ask for the crap via parts request.... And magically it shows up on the counter, so you don't really know the part numbers.




    Correct. Upper/lower trays, intake and exhaust.

    like I said, this is just another thing that needs a special tool that you BETTER make sure whomever is doing the repair is USING it. If not, the cams are not sitting squarely in the bearing provisions in the cam trays.
    yeah, that's what i thought.. but you don't buy 2 of each part, you buy 1 of each, but get 4 separate things.. corrct? hahaha

    the way it was worded before was you need to buy each part number twice

    can you buy the full tray? i can't find a part number haha
    boop

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    I do not believe there are bearings for each cam journal.
    one a each end isn't it?.. no other bearings for the rest of it

    in what way are they machined together, too?

    i haven't seen enough of this before, so i have no idea what to think of it -_-
    boop

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