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  1. #1
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    4 out of 4 members liked this post. Yes Reputation No

    Exclamation Warning to all N5X Engine owners important maintenance check

    The story goes as: (n52)

    New client car gets tow in it cranks with no start after broken acc drive belt. I Check Battery, all sensors etc … Scan test say cam sensor syn both intake and exhaust recheck and do all test to electrical on engine nothing wrong and still cranks with no start.

    Next step I wanted to check mechanical timing. Remove valve cover and first concern lack of oil film and wetness on valve train. Then I find this mess in the timing chain and guides.

    Click here to enlarge

    At this point it looks like acc drive belt in the chain???… move on to remove oil pan and bad news bearsClick here to enlarge

    Click here to enlargeClick here to enlargeClick here to enlarge

    Not sure what to think or how belt got in? Decide to remove crank pulley….. BOOM

    Click here to enlarge

    The belt broke and wrapped itself so tight behind the crank pulley it pushed itself pass the crank seal and shredded it self inside the engine. Damage found: broken and cracked chain guides, tiny belt chunks everywhere and worst of all oil pick-up tub heavily restricted but belt debris. Remove rod bearing cap and find bearing damage due to oil starvation. So please check and maintain the acc. drive belt and tensioner. Don't be dumb and drive it home after the belt has broken to get a tow truck. This is the first I've seen this happen but the bmw dealer I deal with has seen this 3 or 4 times

    Click here to enlargeClick here to enlarge

  2. #2
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    I've seen this happen a couple of times over various forums, to do with the early model subframe? or just otherwise shredding acc belt

    super nasty stuff!
    boop

  3. #3
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    Good pics. Good description of what happened too. I've heard of this happening, but never knew it could get this bad. Isn't there a fix for this involving routing the belt differently so that it avoids that spot?

  4. #4
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    Holy moly, pushed itself through the seal into the engine.
    Burger Motorsports
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    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

  5. #5
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    @Ging, check subframe for contact marks. I though this was an N54 only issue, guess not...

  6. #6
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    Happened to me too Click here to enlarge

    http://www.bimmerboost.com/showthrea...o-2008-MT-335i

    Mine was slightly different though, caused by alternator pulley shearing off.
    Alpine White 2008 6MT 335i - Cobb AP - PTF Tuned - RB Turbos - AR DPs - VRSF 3.5" exhaust - Custom FMIC - 380mm BBK F&R - BMS DCI - M3 DCT LSD - Whiteline subframe bushes - M3 Sways and rear arms - M3 wishbones - ER CP - Spec Stage 3+ clutch and steel SMFW - AST 4100 Coilovers - UUC DSSR -UUC Black tranny mounts - TMS Alu diff bushes - Forge DVs - Aquamist HFS-4 meth - Alufelgen CS7s - BMWP V1 Steering Wheel

  7. #7
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    Wow that is ugly. I wonder if you could cut a disc out of stainless and bolt it in between the crankshaft and the pulley/damper to act as a guard against this.

    Was this car an auto or a manual?
    Eppur si muove.

  8. #8
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    We have seen and fixed this multiple times. We have a disclaimer: if you have a broken belt, and we do not pull the oil pan to inspect for belt material in the oil pan, the customer assumes all responsibility on the engine condition. I have seen it too many times to risk being caught on the hook for a dead engine due to oil starvation.
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  9. #9
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    We have seen and fixed this multiple times. We have a disclaimer: if you have a broken belt, and we do not pull the oil pan to inspect for belt material in the oil pan, the customer assumes all responsibility on the engine condition. I have seen it too many times to risk being caught on the hook for a dead engine due to oil starvation.
    How do we prevent from somthing liek this happeneing?
    Burger Motorsports
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    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

  10. #10
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    replace the belt and tensioner before it breaks.
    Don't let oil leaks linger and continue
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  11. #11
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    replace the belt and tensioner before it breaks.
    Don't let oil leaks linger and continue
    How often(time frame) are these replaced
    Click here to enlarge

  12. #12
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    Its really when the belt starts to walk off the pulley. we just did one on a 08 528 yesterday with 56K on it. Just depends on its condition.
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  13. #13
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Its really when the belt starts to walk off the pulley. we just did one on a 08 528 yesterday with 56K on it. Just depends on its condition.
    Fack... I think I gotta do that then.
    Burger Motorsports
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    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

  14. #14
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    the belt tensioner aluminum bolt should be replace at the same time as the tensioner and tq down to spec. the bolt head popped on this car causing all this. KEEP UP on maintenance Click here to enlarge

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    now everyone who has had their belt shred is freaking out Click here to enlarge had it happen to me in july and it took me and hour to peel all the shreds out of every or phis of the pulley system .
    still have the oil from my oil change after this happened at my shop in milk jugs ,now im going to have to go strain it and see if there is anything in it .

  16. #16
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    1 out of 1 members liked this post. Yes Reputation No
    Its not NOW.


    its in a few months when the belt finally swells, then gets chewed up is when you'll see issues.


    Hell, I've seen belts get sucked in and it doesnt even hurt the front crank seal- no oil leak nothing!
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  17. #17
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    2 out of 2 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    Its not NOW.


    its in a few months when the belt finally swells, then gets chewed up is when you'll see issues.


    Hell, I've seen belts get sucked in and it doesnt even hurt the front crank seal- no oil leak nothing!
    alex I feel so much better now thanks man lol ....@#$#@ !!!!!

    just did the damn clutch 2 weeks ago would have been so easy to do the oil pan gasket and check while I was in there .

  18. #18
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    Click here to enlarge Click here to enlarge
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  19. #19
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    I have read about this a few times on the forums. I guess I am going to go ahead and replace my belt. Why does it get pushed in? The design of the crank pulley?

  20. #20
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    tensioner degrades
    Click here to enlarge
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  21. #21
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    tensioner degrades
    Alex, have you seen this on a 2010 E92 ? I guess my question is if the problem is inherent to the bad subframe design on early models or if all N54s should check for it.
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  22. #22
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    no, you are thinking of two different problems.

    one, E9x cars with early production had the power steering pump pulley contact the sub frame from too soft motor mounts and sub frame clearance. The plastic pulley breaks from contact of the sub frame, belt flips off/shreds/effs up and the engine eats it. A new pulley is needed/subframe/motor mounts/belt/pop off oil pan to inspect oil pump pickup and belt stuff inside the engine.


    two, N5x engines have a belt tensioner that degrades in strength (or the aluminum bolt breaks) causing the belt to ride wrong/flip off/shred/eff up and the engine eats it. A new belt tensioner/bolt/pulley/pop off the oil pan to inspect oil pump pickup and belt stuff inside


    two different issues, and it comes to the same repair (kinda)
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  23. #23
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    So..... guess who has a N54 E90 with a broken belt syndrome here?

    This guy.


    shredded a belt, sucked the belt in, another independent threw a belt on it and didn't check for ingestion.

    car is here running bad. pulled oil pan, oil pickup is FULL of belt material.
    Rod bearings toast- all bearings show copped and FELL OUT when the caps were pulled.


    This engine is smoked. Done. Stick a fork in it. Kaput. Wasted. Junk.
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  24. #24
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    Ugh..that sucks man^
    Click here to enlarge
    ESS 6XX kit

  25. #25
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    Click here to enlarge Originally Posted by bobS Click here to enlarge
    Ugh..that sucks man^

    Sucks for the owner- not for me. I'm just trying to figure out the best value for him to get the car back on the road.


    its a shame it isnt a Xi- or i would just buy it straight up from him as it sits. i need that drivetrain for my E21 Click here to enlarge


    BTW, anyone see an Xi drivetrain floating around? I got a bad bug for some all wheel drive action now after pedaling a ZR1 corvette down the road lol
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