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  1. #1
    rwthomas1
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    Loud screeching noise from 540i????

    Hello All,
    Just replaced the belts, idlers and tensioners on my 540i last night, and changed a PS hose too. On the way home from dinner tonight a whining noise developed, changes with RPM, and intermittently there will be a very loud screeching for a few seconds. The engine actually stalled during one of these screeching events!! Slight "burnt rubber" smell. Sometimes it will do it when I rev the engine up, sometimes not. Since its electronic throttle I cannot be under the hood and rev it at the same time, and no one to do that for me just yet....

    There was a little hairpin looking bit with the alt/wp/ps tensioner that I had no idea what to do with it. Anyone know what it was for? I thought maybe it locked a tensioner but I couldn't find anywhere it would fit.....

    If I had to guess I would say an accessory, alt, wp or ps is about to fail. Maybe the new tensioner instigated it, maybe not. I know that tensioning the alt/wp/ps belt is a b!tch, if somehow I screwed up the process, too much tension could have killed something?

    I may tear into it tonight. Pull the belts and spin everything to see if I can feel the problem.

    Any ideas welcome!

    RT

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    did u check the steering fluid levels again?



    Andreas
    Queens NY
    BMWCCA# 186796
    86 325es (wrecked by careless driver)
    87 325 (project for life)
    00 540is 6spd (daily driver)

  3. #3
    rwthomas1
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    Re: did u check the steering fluid levels again?

    Steering is/feels normal, fluid in the reservoir, 1/2" up on the dipstick.
    RT

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    Re: Loud screeching noise from 540i????

    Well take it from a guy (me) who's water pump failed causing $2000 worth of damage because of the poor design of front end of the engine area (thanks bmw). better find this problem and find it fast. one guy on here was gloating because he changed his water pump before it failed saving his a catastrophe. how are you supposed to know? take the time to check everything and if you can't i guess the rule of thumb with these cars is to replace anything you don't know the condition of. is it worth is?plexus
    http://www.oldbmw.com
    00 540i M sport/6sp (Dieter)
    71 3.0CS euro (Anelise)
    84 528e (Florian - decommissioned)


  5. #5
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    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    The hairpin thing is just a clip to keep the bolt(

    on the tensioner assy from falling out in shipping, you don't use it.
    I'm guessing the screeching was from a slipping belt. Did you check the belt deflection after you adjusted the tensioner?

  6. #6
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    Member No: 119706 Bmw540san is on a distinguished road Bmw540san's Avatar
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    Did you double check the routing of the belt? It

    could happen to any of us if not paying attention.



    1998 BMW 540i 6 speed
    Arctic silver, M sport suspension (euro delivery), prod. date 05/98, non VANOS
    Staggered 18" style 32 OEM wheels
    3.15 open differential
    Remus exhaust
    AFE CAI with improved heat shield
    Z3 shifter
    VDO oil pressure and temperature gauges in place of headlight/fog switches
    Powder coated valve covers-satin black
    CDV delete
    Debadged
    AEA DRL module (aftermarket daytime running lights)

    1997 BMW 528iA
    Alpine white, premium package, prod. date 04/97, single VANOS
    Staggered 17" style 32 OEM wheels
    Debadged
    AEA DRL module
    Custom made sun blinds for rear seating area

    2000 Nissan Frontier Desert Runner, AKA "The Work Horse"

    Garage aids:
    Direct Lift Pro Park 8
    Campbell Hausfeld 28 gallon oil lubricated air compressor
    Newair ACP-1400H portable air conditioner and heater
    Auto Enginuity scan tool with BMW enhanced option
    Actron 9135 scan tool-for quick readouts



  7. #7
    rwthomas1
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    Reinterate: Loud screeching noise from 540i????

    Just to restate, when the loud screeching occur(s) at idle it has STALLED the engine. I don't think that a loose belt would do that, only a tight one. The only pulley with enough belt purchase to STALL the engine is the WP. Alt is small diameter and PS is only 1/4 wrapped by the belt. If they seized the belt would just smoke. WP is the only thing that makes sense.

    I'm on my way to the garage to take it all apart and find out, I'll update when I tear it down.

    RT

  8. #8
    rwthomas1
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    Update: Loud screeching noise from 540i????

    Removed the alt/wp/ps belt and the problem is obvious. Alternator is fried! WP/PS turn nice and smooth, Alt is crunchy and grinding. Easier to replace than the WP but much more expensive? I guess I'll find out.

    RT

  9. #9
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    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    Been there done that. New (rebuilt) from BMW is (m

    probably $700+, online sources (also rebuilt) you may find one for $400. If you get in a bind and really need one in a hurry I have a used one that you can borrow.

  10. #10
    rwthomas1
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    Re: Been there done that. New (rebuilt) from BMW is (m

    Thanks for the offer, Bavauto has them for $511 including $100 core, so $411, not too bad. Going to try Inskip in the AM, see what they can do. Dad lives in NH, so a trip to Bavauto tomorrow may be in the cards. RT

  11. #11
    BMW540san
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    Autohausaz has it for $393. It's probably the best

    price on that at the moment. Good luck.
    http://www.autohausaz.com/search/pro...er=12317508054

  12. #12
    rwthomas1
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    Update-Completed!

    Got a reman Alt from the local parts store, $410 + core. 3year warranty. Got the pulley holding tool and wrench for the WP pulley at Bavauto. Worth every penny. The fan was so tight that I needed to place the holding tool against the fenderwell and pound the wrench with a hammer. Hard. No way that it was coming off with any homebrewed setup.

    Replacing an alternator is pretty easy ONCE YOU GET THE FAN OFF! In fact, I will probably remove the fan just to change the serpentine belt, it makes it that much easier.

    A few tips: Loosen the alternator first and gently crack the coolant seal. This will allow the coolant to drain slowly while you work on the fan, etc. and not splash everywhere. On a 540 automatic, the alternator CANNOT be removed from the bottom. The auto transmission cooler is in the way. Removing that is a b!tch so just pop the upper rad hose off and take the alt out the top. Check the WP pulley carefully. Mine was cracked, just barely visible.

    Fun, fun, fun!

    RT

  13. #13
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    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    Did you notice there was a drain plug for the alt(

    If you just want to drop the coolant level in the block you can also use the alternator drain plug.


  14. #14
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    Jim, I love how you have pictures of ....

    just about everything on these cars. Great job. Your input on this post has been valuable.Fritracer
    Cincinnati, OH
    2000 540ia Sport Package 9/99 Silver/Black
    1970 Dodge Challenger T/A 420 stroker w/6 Pak 430 HP,
    510 lbft torque

  15. #15
    Eurodavid
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    That plug just drain alt? Or whole system too???


  16. #16
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    I have a used water cooled alt if you need it.....

    Bought it used as a spare just in case, but if you need it $250 and will guarantee it not to be dead on arrival because I got it off a wrecked 540 and have never used it.
    2002 540 6 speed, Steel Blue/Black interior, totally loaded with every option, and now with built in Stealth One/Valentine 1. 18" Staggered Privat wheels. I am loving the power again!

    2003 525iT, Silver/Black, non-sport, 18" Staggered BBS RC wheels. T boned and traded away.

    2000 540 6 speed, Biarritz Blue/Sand, M5 shifter, XM Radio Valentine One/Stealth One hardwired in, 17" style 5 wheels
    Sold but never forgotten.

    2001 525i, stock, great car that got me hooked, sold

    [IMG]][IMG]

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