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AZBMW Forums › Model Specific Discussion › 5-8 Series › E39 M62 Fan Explosion
E39 M62 Fan Explosion
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KINGAMR
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PostPosted: Tue Feb 28, 2012 3:23 pm
Post subject: Re: E39 M62 Fan Explosion

Mine exploded at a stop sign 20ft from where I park in front of my house.

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bmw325i
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PostPosted: Tue Feb 28, 2012 8:39 pm
Post subject: Re: E39 M62 Fan Explosion

I just read this thread and I am going paranoid already. I have a BMW 540i 1997, running fine so far. I don't know if the fan clutch has been replaced, but what is the main cause for this mayhem to happen under the hood? Is it the fan clutch or engine mounts, or water pump seizing?
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Rares
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PostPosted: Tue Feb 28, 2012 10:10 pm
Post subject: Re: E39 M62 Fan Explosion

wow man, soo sorry to hear... sucks when stuff messes up the paint.. that stuff aint cheap...
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ccc13
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PostPosted: Tue Feb 28, 2012 11:34 pm
Post subject: Re: E39 M62 Fan Explosion

bmw325i wrote:
I just read this thread and I am going paranoid already. I have a BMW 540i 1997, running fine so far. I don't know if the fan clutch has been replaced, but what is the main cause for this mayhem to happen under the hood? Is it the fan clutch or engine mounts, or water pump seizing?

Usually it's motor mounts causing the fan to rock with the engine under load, causing the fan to contact the shroud surrounding it, thus causing explosion. That alone or in combination with a viscous coupling on its way out (as in my case) pretty much guarantees this result sometime in your future, unfortunately...

Best idea is to do motor mounts (they're easy) and an electric fan conversion from Spal/Bimmerworld/what have you before it blows up in your face Smile

@Graham, Rares, etc: No worries, things happen!


Oh yeah, found some more damage... intake boot sliced in a couple places, post-MAF Mad


Now that's how you break a BMW coolant tank! None of those weak ass thermal cracks, I send fan blades into it at high speed!
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ti_kid
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PostPosted: Tue Feb 28, 2012 11:47 pm
Post subject: Re: E39 M62 Fan Explosion

just remember another perk to ditching the mechanical fan... no more vacuum noise when your slowly taking off from a light and the fan clutch is engaged. i hate that sound.
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ccc13
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PostPosted: Wed Feb 29, 2012 1:51 am
Post subject: Re: E39 M62 Fan Explosion

ti_kid wrote:
just remember another perk to ditching the mechanical fan... no more vacuum noise when you're slowly taking off from a light and the fan clutch is engaged. i hate that sound.

Vacuum? How about 747 at takeoff thrust? Wink
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Jass
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PostPosted: Wed Feb 29, 2012 2:57 am
Post subject: Re: E39 M62 Fan Explosion

Any recommendations for mounts beside the Febi ones that are a bit more economical but not Asian imports?
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ccc13
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PostPosted: Wed Feb 29, 2012 4:25 am
Post subject: Re: E39 M62 Fan Explosion

I don't have any recommendations, but I'd appreciate some Smile
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bmw325i
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PostPosted: Wed Feb 29, 2012 2:40 pm
Post subject: Re: E39 M62 Fan Explosion

I did a bit online searching, FCP Croton has the Rein brand $85 for the pair, Pelican Parts has the Febi brand about the same price but priced separate. The OEM brand is about $60 each.

I think I am going to get the transmission mounts and do those as well along with the engine mounts.
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bmw325i
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PostPosted: Wed Feb 29, 2012 4:42 pm
Post subject: Re: E39 M62 Fan Explosion

I went ahead and purchased the Febi ones from pelican, i went that route since i had a coupon that was expiring from the vendor pretty soon, bought the tranny mounts too, all for just under $100.

Stay away from the Uro brand though.
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Jass
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PostPosted: Wed Feb 29, 2012 8:37 pm
Post subject: Re: E39 M62 Fan Explosion

I saw Meyle has these as well. Anyone have experience with them for mounts?
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Iasimovian
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PostPosted: Wed Feb 29, 2012 8:47 pm
Post subject: Re: E39 M62 Fan Explosion

Wow, looking at these pics I wonder if I should plan to convert my Z-3. Hmm, how would one incorporate a electric fan into a car with a condenser fan. Maybe just boost the condenser fan CFM and loose the regular viscous altogether?

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ccc13
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PostPosted: Thu Mar 01, 2012 12:11 am
Post subject: Re: E39 M62 Fan Explosion

Iasimovian wrote:
Wow, looking at these pics I wonder if I should plan to convert my Z-3. Hmm, how would one incorporate a electric fan into a car with a condenser fan. Maybe just boost the condenser fan CFM and loose the regular viscous altogether?

I'm pretty sure we all have condensor fans as well... it's most likely not up to the task of flowing enough air for the radiator and condensor heat exchangers, especially in AZ summers. We're talking replace the viscous POS with an electric one. The condensor fan is a pusher and the main radiator fan is a puller.

@325i: Thanks for the advice. I'll probably do the FCP Groton Rein ones, I guess.
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Iasimovian
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PostPosted: Thu Mar 01, 2012 2:40 am
Post subject: Re: E39 M62 Fan Explosion

ccc13 wrote:
Iasimovian wrote:
Wow, looking at these pics I wonder if I should plan to convert my Z-3. Hmm, how would one incorporate a electric fan into a car with a condenser fan. Maybe just boost the condenser fan CFM and loose the regular viscous altogether?

I'm pretty sure we all have condensor fans as well... it's most likely not up to the task of flowing enough air for the radiator and condensor heat exchangers, especially in AZ summers. We're talking replace the viscous POS with an electric one. The condensor fan is a pusher and the main radiator fan is a puller.

@325i Thanks for the advice. I'll probably do the FCP Groton Rein ones, I guess.
I just don't think a push-me pull you setup (pusher condenser fan and puller rad fan) would be optimum. IIRC years back when I was a SPAL dealer they even had a tech bulletin advising that one set of fans acts as a restriction. Also seems to me that puller setups would always outperform pushers if designed right (sealed at the sides). I remember a car I worked on years ago had rubber flap "gills" on the engine side of the shroud that would open at speed to allow the ram air to bypass the viscous fan. Maybe the best setup would be a well made shroud sporting 2 high performance puller fans on the engine side, removing the condenser fan and making sure the condenser is sealed to the radiator shroud creating in effect a plenum. Once I get the engine issue I am dealing with resolved I will have to look into this. Dach.

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ccc13
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PostPosted: Thu Mar 01, 2012 4:25 am
Post subject: Re: E39 M62 Fan Explosion

Iasimovian wrote:
I just don't think a push-me pull you setup (pusher condenser fan and puller rad fan) would be optimum.

Fair enough, it's not optimum but it's better than an exploding viscous coupling. However it did come from the factory with the push-pull setup.

You're right in saying pullers are typically more efficient, and a two-fan puller setup is something to look into. I'm not sure which would cover more surface area and/or flow more air.

That said, I'm still going to do a big single with a multiple speed controller. 2000+ CFM is good enough for me, and I'm not about to throw any CFD at this thing. I also don't feel like redesigning and manufacturing a new shroud to support any setup other than one very similar to the OEM rig.
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