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E28 (1982 - 1988)

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  #1  
Old 09-25-2012, 05:01 PM
thedust1 thedust1 is offline
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Mein Auto: 1988 528e SuperETA
1988 528e Water Pump Question

My 88 528e Recently got a nasty coolant leak. I turns out it is a faulty water pump. However when I went to purchase my water pump from a website, it lists two different kinds. First one has a two-hose connection and the other has a single hose connection. My Bently manual neglects to tell me which one is for '88 models, and which is for pre-'88 models.

If anyone knows which water pump my vehicle uses (two hose, or single hose connection.) the info would be greatly appreciated
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  #2  
Old 09-25-2012, 06:24 PM
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catso catso is offline
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Location: Chicago
 
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Mein Auto: 2000 323i, 1988 528e
Quote:
Originally Posted by thedust1 View Post
My 88 528e Recently got a nasty coolant leak. I turns out it is a faulty water pump. However when I went to purchase my water pump from a website, it lists two different kinds. First one has a two-hose connection and the other has a single hose connection. My Bently manual neglects to tell me which one is for '88 models, and which is for pre-'88 models.

If anyone knows which water pump my vehicle uses (two hose, or single hose connection.) the info would be greatly appreciated
I don't remember how it looks, but order it by part number. Look up the correct part number first on www.RealOEM.com then do a search on this website: http://furiousmethod.com/
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  #3  
Old 09-25-2012, 07:47 PM
ClementLewis ClementLewis is offline
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I believe that it is the two. I am getting a 528 and facing the same problem. If you find out please let me know.
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  #4  
Old 09-25-2012, 08:35 PM
thedust1 thedust1 is offline
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Mein Auto: 1988 528e SuperETA
Thanks for the Replies.

I did some research and found that the 2 hose water pump is for "82-"87
And the single hose water pump is for the "88 Models
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  #5  
Old 09-25-2012, 08:55 PM
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catso catso is offline
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Mein Auto: 2000 323i, 1988 528e
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Originally Posted by thedust1 View Post
Thanks for the Replies.

I did some research and found that the 2 hose water pump is for "82-"87
And the single hose water pump is for the "88 Models
There are lots of parts that only the '88 528e uses. Some of them it shares with the E30 M20 6 cylinder cars like the water pump and other engine parts. Other parts like the exhaust system are totally unique to the '88 528e. ALWAYS look up the part number before you order anything, otherwise you could be in big trouble. Never buy important parts from a chain auto parts store. Case in point; timing belts for early E28's have 128 teeth, the later years have 127 teeth; if you use the wrong belt you will destroy the valves and possibly much more. One other thing you may want to know, when you replace the water pump it's easier if you glue the pump gasket to the block first, and have a small needle nose visegrip pliers to hold the small end of the tensioner spring assembly when you install the pump. You'll see why it's invaluable when you try to do it.
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  #6  
Old 09-26-2012, 04:48 AM
ClementLewis ClementLewis is offline
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Thanks for the research!!
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  #7  
Old 09-26-2012, 10:52 AM
ganglin3665 ganglin3665 is offline
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Location: Illinois
 
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I just went through this. I went through oreilley and they ordered in the single outlet. Did not match my 88 528e. So I got my money back and they looked it up under 1987 and found the two hose unit. I was able to get it through autozone same day. you can also order online through rock auto which had both shown. I am guessing there was a change mid year on this part.

The difference is easy to tell by looking at the coolant expansion tank connection point. The coolant expansion tank connects to the water pump and the second hose goes up to the thermostat housing.
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  #8  
Old 09-26-2012, 11:50 PM
thedust1 thedust1 is offline
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You are right ganglin3665. I confirm, just had the same thing happen.
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  #9  
Old 09-28-2012, 05:12 PM
thedust1 thedust1 is offline
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Mein Auto: 1988 528e SuperETA
For Future Reference if anyone attempts to change their own Water Pump, or remove the Fan Clutch. You can buy a thin 32mm Wrench at almost any bike shop for around $20... Hey its better than buy/loaning the tool from a parts store for $200
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