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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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 01-05-2016, 07:31 AM
scdodge58 scdodge58 is offline
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Location: Pembroke, MA
 
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Mein Auto: '89 325ic, '99 540
Leaky Alternator

Happy New Year to all...my first post! I have a '99 540 with a leaky alternator. The leak is coming from the housing/water jacket itself, not from the hose at the top. Is that housing replaceable? Is there a way to stop the leak (which is weeping from a seam in the casting)? This is a new one on me. The alternator is charging fine. Thanks to all in advance who can lend a hand.
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  #2  
Old 01-05-2016, 07:42 AM
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mattmar1 mattmar1 is offline
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welcome to the fest...sorry i know very little about the v8 models, hopefully youll find what you need from ones who do on here, and theres many of em.
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99 528i 5sp sport, vanos rebuild,coolingoverhaul,stripped/repainted/polished/recoated OEM BBS style 5 wheels, new paint , all int/ext LED's clear corners, all vac leaks fixed, eonon 5166, ECS short shifter, LED ae's and fog lights (clear), all brakes, fixed trifecta, rear control arm camber repair, new throttle body, ccv delete, but it ended up as a huge vac leak, returned to new stock ccv, new injectors, cloned and replaced dme.
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Old 01-05-2016, 07:49 AM
Edge540 Edge540 is offline
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just pull alternator from housing and replace the seal, about 15.00 from bmw
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Old 01-05-2016, 08:34 AM
scdodge58 scdodge58 is offline
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Mein Auto: '89 325ic, '99 540
You just made my day! Is the seal part of the alternator or part of the housing? I just want to be able to identify it when I take the alternator out.
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Old 01-05-2016, 09:05 AM
Edge540 Edge540 is offline
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it isn't a part of either it seals between the alt and housing, when I get home tonight I will get the part# for you if needed

Last edited by Edge540; 01-05-2016 at 09:06 AM.
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Old 01-05-2016, 09:05 AM
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computiNATEor computiNATEor is offline
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Quote:
Originally Posted by scdodge58 View Post
You just made my day! Is the seal part of the alternator or part of the housing? I just want to be able to identify it when I take the alternator out.
Not sure if this is exactly the correct model year, (09/1999), but here's the RealOEM page:
http://www.realoem.com/bmw/enUS/show...diagId=12_0981
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Seabiscuit: 03-11-03 e39 530i Sport, Steptronic, Black/Black
Totaled (by me!) & Rebuilt in Fall 2014
Completed Work: Maintenance; Silver gauge rings; ECS Tuning SS Brake Hoses; Koni FSD "Golds"; Meyle rotors, Akebono Euro Ceramic pads (no dust, no bite); BMW blue-painted calipers; Aux retrofit; Canholder delete; Ultimate Cup Holders; Custom IKE coding; "BMW" valve stem dust caps; Euro lower dash; GAS DISA rebuild + coolant cap.
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Old 01-05-2016, 11:37 AM
scdodge58 scdodge58 is offline
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Thx computiNATEor for the diagram...that is helpful. However, now I am a little confused. It would appear as if that gasket would keep the antifreeze from leaking out from around the front of the alternator. My leak is along a seam in the cast of the housing. Would the gasket help that? Maybe the gasket keeps the fluid in the water jacket? If so, if I replace the gasket do I have to crimp or take off the antifreeze line going into the housing/water jacket? Forgive my naivety...but these water-cooled alternators are new to me.
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Old 01-05-2016, 12:46 PM
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computiNATEor computiNATEor is offline
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Heh, no worries, they're new to me, too. I have a 530i, so I don't really know. Here's a video of the alternator being removed and re-installed; maybe it will help you.

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Nate J.

Seabiscuit: 03-11-03 e39 530i Sport, Steptronic, Black/Black
Totaled (by me!) & Rebuilt in Fall 2014
Completed Work: Maintenance; Silver gauge rings; ECS Tuning SS Brake Hoses; Koni FSD "Golds"; Meyle rotors, Akebono Euro Ceramic pads (no dust, no bite); BMW blue-painted calipers; Aux retrofit; Canholder delete; Ultimate Cup Holders; Custom IKE coding; "BMW" valve stem dust caps; Euro lower dash; GAS DISA rebuild + coolant cap.
Bold text is best mod!
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