Mechanical Fan Mod - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #1 of 37 Old 21st March 2019, 04:48 PM Thread Starter
bdiefAZ
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Mechanical Fan Mod

Fan Modification for V8 e39 cars and M70 equipped cars.
I have swapped out 3 fan blade/fan Clutch Assemblies recently with this modification:
· e39 with M62Tu engine - 300+ miles on this car
· e39 with S62 engine - 500+ miles on this car
· e31 with M70 engine - 150+ miles on this car

The fan comes from the E65, E66, and E67 7 Series, as well as the E53 X5 with V8 and mechanical fan:

Parts needed for the mod:
Fan Blade 17417504732
Fan Clutch 17417505109

The new fan is quieter, potentially less prone to breakage, and moves more air than stock fan. You can feel the air pulling through the grill when the engine is running.

In order to perform this change, The fan blade and clutch must be used together, the new blade will not attach to existing fan clutch. This mod is early in testing, but so far, working well. All fan clutches that came stock on cars listed are 92CEL, the new fan clutch is 92CEL as well.

About the fan: it has the same dimensions and offset of the stock V8/V12 fan, fits in stock shrouds on all cars mentioned.

I cannot post the images on this site, not sure why. I would be happy to email them to anyone who can post.

Last edited by bdiefAZ; 21st March 2019 at 04:50 PM.
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post #2 of 37 Old 21st March 2019, 06:07 PM
DaveinGigHarbor
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Garage
Thanks for the info, with part numbers. I may do this soon. Seems like a good idea.

2000 BMW M5, Anthracite with Heritage black leather
2008 Audi RS4 Cabriolet, Datona Gray with silver leather
2017 Chevy Silverado, my economy car!!!
1999 528iT, black/black, 212k miles. The Black Rat
2002 540iA, Silver with black leather


Gone but not forgotten:
2000 BMW 540/6 - Silver
2000 BMW 540/5 - Blue
2002 BMW 540/6 - Grey
2001 BMW 525it/auto
2001 BMW 525i/auto
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post #3 of 37 Old 21st March 2019, 06:17 PM
garlei
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Interested to see how this mod performs please update that us every now and then
Please email some pics to [email protected]

I'll try to upload the photos to this thread on your behalf
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post #4 of 37 Old 21st March 2019, 07:05 PM
Sailor24
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A little puzzled, what temp does that new fan/clutch assembly kick on? Each of those cars has different activation temps for their stock fans. Is there some way this mod compensates for that?
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post #5 of 37 Old 22nd March 2019, 05:17 AM
garlei
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Photos on behalf of bdiefAZ:

1) after with e65/66/67 7 series, e53 x5 fan


2) before: stock fan


3) side by side comparison


4) mod on e39 with m62tu engine




Quote:
Originally Posted by bdiefAZ View Post
Fan Modification for V8 e39 cars and M70 equipped cars.
I have swapped out 3 fan blade/fan Clutch Assemblies recently with this modification:
· e39 with M62Tu engine - 300+ miles on this car
· e39 with S62 engine - 500+ miles on this car
· e31 with M70 engine - 150+ miles on this car

The fan comes from the E65, E66, and E67 7 Series, as well as the E53 X5 with V8 and mechanical fan:

Parts needed for the mod:
Fan Blade 17417504732
Fan Clutch 17417505109

The new fan is quieter, potentially less prone to breakage, and moves more air than stock fan. You can feel the air pulling through the grill when the engine is running.

In order to perform this change, The fan blade and clutch must be used together, the new blade will not attach to existing fan clutch. This mod is early in testing, but so far, working well. All fan clutches that came stock on cars listed are 92CEL, the new fan clutch is 92CEL as well.

About the fan: it has the same dimensions and offset of the stock V8/V12 fan, fits in stock shrouds on all cars mentioned.

I cannot post the images on this site, not sure why. I would be happy to email them to anyone who can post.
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post #6 of 37 Old 23rd March 2019, 05:34 AM
Rittmeister
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I'm pretty interested in this idea. I know some E36 folks were fooling with something similar about the time I got out of my M3 and into my M5; I think that fan blade was from a diesel BMW of some kind. E36 cars seem even more prone to fan explosions (and other cooling system breakages for that matter) than the E39 just based on frequency of reports I've seen, though I admit I don't know it for a fact. Either way I hope the OP will report back after another significant interval, and I'll be considering this for my car.
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post #7 of 37 Old 24th March 2019, 01:22 AM
clarkwgriswold
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Great info, I ironically was pulling my the front half of the 4.6 apart to do the timing and was looking at the E53 fan assembly for my 540 as it definitely looks beefier than the stock one.
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post #8 of 37 Old 29th March 2019, 06:18 PM
mech9t8
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Do you know what the weight difference is?
The clutch looks bigger on the new set up which makes me think it's heavier.
Added weight may not be good for the water pump.
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post #9 of 37 Old 2nd April 2019, 09:31 PM Thread Starter
bdiefAZ
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It adds some weight, but seems to be more stable in rotation, time will tell.

Do the e65's have a high rate of water pump wear?
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post #10 of 37 Old 2nd April 2019, 11:21 PM
Hakon
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Our water pumps would last much longer if they were not connected to the fan and clutch, no mind being heavier.

Last edited by Hakon; 2nd April 2019 at 11:21 PM.
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