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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 07-03-2011, 02:09 PM
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DinanBimmer DinanBimmer is offline
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Dented hood from fan shattering, replace or repair it what's cheapest?

Anybody have any idea if it would be cheaper to repair dents on an existing hood and repaint it as opposed to buying a new hood and having that painted?
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  #2  
Old 07-03-2011, 02:20 PM
uncmozo uncmozo is offline
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I would start calling junkyards. Probably the best way to go IMHO.
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  #3  
Old 07-04-2011, 12:05 PM
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bluebee bluebee is offline
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You might PM the guys who also went through hoods & quarterpanels from the same problem:
- Pictorial guide to cooling system failures & the results thereafter (1)






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  #4  
Old 07-04-2011, 12:33 PM
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DinanBimmer DinanBimmer is offline
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Alright I'll look a bit more for answers, those pics show pretty much exactly what happened to my hood.
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  #5  
Old 07-04-2011, 12:48 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by DinanBimmer View Post
those pics show pretty much exactly what happened to my hood.
It has never happened to me but from the threads I've read (most of which are crosslinked in that one pictorial cooling systems failure thread I already referenced), it seems the cause of the problem is generally:
  1. The motor (or transmission) mounts are sagging
  2. Or the viscous van clutch seized in the locked position
There are some who say it's more often the former than the latter, which means it's very important for you to figure this out or it will happen again to your newly repaired hood.

What was the cause of your fan blades disintegrating?
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  #6  
Old 07-05-2011, 11:06 AM
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DinanBimmer DinanBimmer is offline
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Well, I wasn't personally driving the car but from what I hear from my brother who was driving it at the time he was passing a car with the rev just a bit too high and it disintegrated. Keep in mind that my car was high in the miles when this happened. I think it's bound to happen to any engine with high mileage. Perhaps a carbon fiber hood would be good protection against damage to the hood.
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  #7  
Old 07-05-2011, 11:16 AM
Ben Carufel Ben Carufel is offline
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Quote:
Originally Posted by DinanBimmer View Post
Well, I wasn't personally driving the car but from what I hear from my brother who was driving it at the time he was passing a car with the rev just a bit too high and it disintegrated. Keep in mind that my car was high in the miles when this happened. I think it's bound to happen to any engine with high mileage. Perhaps a carbon fiber hood would be good protection against damage to the hood.
Carbon fiber would likely crack/shatter when hit with impact that's hard enough to punch through the factory hood.

The best protection against damaging the hood is replacing the fan and fan clutch before it happens.
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  #8  
Old 07-05-2011, 01:10 PM
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Interesting, I'll have the shop take a look at it and see what state it's in. The plastic guard around the fan definitely didn't stop the fan from tearing up the hood. Here's an attached photo of the damage.
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  #9  
Old 07-05-2011, 01:51 PM
zman2001 525i zman2001 525i is offline
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If you want to go cheap either junkyard or certi-fit. You can get a BMW hood from Tischer for about $650 shipped. Probably another $400-$500 to paint / install at a body shop.
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  #10  
Old 07-05-2011, 04:40 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by Ben Carufel View Post
The best protection against damaging the hood is replacing the fan and fan clutch before it happens.
I don't disagree.

But.

When I researched this (at the time of my cooling system leak), I was told by one of our suppliers that the fan almost never breaks 'on its own' - it's always as a 'result' of the clutch or the mounts.

So, the theory goes - you don't need to replace the fan (unless of course it shows evidence of wear). Likewise, if you 'just' replace the fan after it has disintegrated, you'll have the problem again ('cuz, the theory goes, the fan wasn't the problem).

I'm not sure if that theory is correct - but - I didn't replace my fan. I just replaced the clutch.

What do others think?
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  #11  
Old 07-06-2011, 04:55 AM
aioros aioros is offline
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Bluebee: imho knowing how the heat/cold cycles affects the cooling system plastic components and knowing how weak are those components after 80K miles, I'd say that even if the fan is in "good" condition, I'd replace it, as part of the cooling overhaul.
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  #12  
Old 07-06-2011, 05:11 AM
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The hood is about $800. Note that the padding under it is a separate part, and that's over $100, more like $130-150 as I recall. If it was just dented, you might be able to have a body shop fill it, but with those punctures . . . dunno, might be better off just replacing it, money wise. Also I hope the hinges are still good, as those are pricey too (surprise).
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  #13  
Old 07-06-2011, 07:04 AM
Melrose Melrose is offline
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I could not believe what happened to me. While changing the belts on my 128 k 1999 540, I dropped the fan a distance of 18 inches, and it literally exploded. Why not a nylon fan like the rest of the world ?
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  #14  
Old 07-08-2011, 06:16 AM
StevieV22 StevieV22 is offline
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Mine exploded around 60k.
I'll stop by a body shop today and come back with what I'm quoted
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  #15  
Old 07-08-2011, 08:37 AM
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Quote:
Originally Posted by DinanBimmer View Post
Interesting, I'll have the shop take a look at it and see what state it's in. The plastic guard around the fan definitely didn't stop the fan from tearing up the hood. Here's an attached photo of the damage.
WOW! It even blasted the paint off the hood emblem! I'd rather have a salvage yard hood than have that repaired. It looks bad.
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  #16  
Old 07-08-2011, 10:57 AM
Joe@Bavarian Joe@Bavarian is offline
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The problem with bondo on a hood is you can see it 90% of the time. A good shop will not even offer to fix it.

You can also use a OEM metal fan blade off a E32 750IL when you replace it so it does not happen again.
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  #17  
Old 07-08-2011, 11:06 AM
Chisum Chisum is offline
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Electric Fan

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  #18  
Old 07-08-2011, 01:02 PM
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DinanBimmer DinanBimmer is offline
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The fan has since been replaced and the emblem as well. I think I'll go for a replacement hood. Found one on ebay recently that came off an E39 M5. Does anyone know if an M5 hood will fit on my 540? The best part about this hood is that the color matches.
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  #19  
Old 07-08-2011, 06:37 PM
Ben Carufel Ben Carufel is offline
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Quote:
Originally Posted by DinanBimmer View Post
The fan has since been replaced and the emblem as well. I think I'll go for a replacement hood. Found one on ebay recently that came off an E39 M5. Does anyone know if an M5 hood will fit on my 540? The best part about this hood is that the color matches.
It's the same part. It'll fit fine.
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  #20  
Old 07-08-2011, 07:09 PM
Tyrone Tyrone is offline
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Quote:
Originally Posted by DinanBimmer View Post
The fan has since been replaced and the emblem as well. I think I'll go for a replacement hood. Found one on ebay recently that came off an E39 M5. Does anyone know if an M5 hood will fit on my 540? The best part about this hood is that the color matches.
I'm located in Orange and have a hood in Titanium Silver if you're interested..if it's any more convenient to you than purchasing on eBay. If any interest I can try to take some pictures, though accessibility is tight at its current location. Removed from 00 540i
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  #21  
Old 07-09-2011, 03:13 AM
Burning2nd Burning2nd is online now
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/me gets nervous when He see's this


I have no date to reference when this was last replaced, and since wifey managed to mess up my hood already... idk what to do

/me looks concerned and upset

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  #22  
Old 07-09-2011, 06:16 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by Joe@Bavarian View Post
You can also use a OEM metal fan blade off a E32 750IL when you replace it so it does not happen again.
Hi Joe,

If the flying-fan problem 'really' is a bad fan clutch or engine/transmission mounts, what would happen if someone replaced a plastic fan with the metal fan - without fixing the underlying problem?
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  #23  
Old 07-14-2011, 05:43 PM
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ncmallard78 ncmallard78 is offline
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i bought a certafit hood a year ago for 150 bucks. the fit looks great and im very happy. on a high milage bimmer it was the only way to go.
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  #24  
Old 07-14-2011, 06:01 PM
fortunateson fortunateson is offline
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[QUOTE=bluebee;6170929]You might PM the guys who also went through hoods & quarterpanels from the same problem:


-Bluebee, I really appreciate all the info you share, however, for a fan to chew up a quarter panel it would have to pass the "B" pillar which I don't think could happen. It will chew up a font fender pretty good though.

When it comes to repairing a hood as thin as a E39's it is truly a major chore as you will end up chasing any stretches or shrinkage forever. A good recommendation is a good used hood, soda blast it by someone who knows what they're doing, and refinish. If soda blasting is not an option have the painter spray sealer over the original paint to prevent bleed through and then repaint.

Last edited by fortunateson; 07-14-2011 at 07:17 PM.
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  #25  
Old 07-15-2011, 01:08 AM
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Quote:
Originally Posted by fortunateson View Post
for a fan to chew up a quarter panel it would have to pass the "B" pillar which I don't think could happen. It will chew up a font fender pretty good though.
I'm basing that on this thread from another forum:
- I checked it once a month, but yet...

So, if it's not a 'quarterpanel', what is the name of this punctured part?



PS: Here is a closeup of the punctured (whatever it's called) panel:
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