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W123 230
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Discussion Starter #1
My water pump is seized and needs replacing but I cannot get it out of the housing.

I have had it submerged in vinegar for the last two days to try and break down any rust and free it, but it just wont budge.

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Anyone have any suggestions?
 

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W123 230
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Discussion Starter #3
Yeah that may be the only way forward. The housing appears to be in good order (other than having a knackered pump firmly lodged inside it) so I would like to avoid scrapping it if at all possible.
 

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1982 300d four speed turbo & 1984 300d four speed N/A euro
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I think you have to replace the whole thing including the "housing".

Allan Morris

That is not true, the water pump should remove from the housing.

I would try a blow torch and a mallet at this point, maybe some PB blaster as well. If you ever get them separated I would take a dremel with a small wire wheel and polish off all of that rust.
 

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Spudfather,
Your car is listed as a 230E but that is not a photo of a 230E water pump. Every picture of replacement water pump for a 230E shows the complete housing that bolts on to the front of the engine.
Don’t waste any more time or vinegar trying to extract it!
Unless of course it’s from a diesel engine perhaps?
 

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Actually looking at the photo again it is from a 230E, just at an unfamiliar angle.
When you go shopping for a new pump you will see what I am talking about...
 

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1985 300 TD 1981 300 SD
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That is not true, the water pump should remove from the housing.

I would try a blow torch and a mallet at this point, maybe some PB blaster as well. If you ever get them separated I would take a dremel with a small wire wheel and polish off all of that rust.
I'd try heating the aluminum housing around the edge of the water pump with a propane torch and hitting the sides of the water pump itself to start rocking it and hopefully breaking it loose.
 

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1982 300d four speed turbo & 1984 300d four speed N/A euro
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Y
I'd try heating the aluminum housing around the edge of the water pump with a propane torch and hitting the sides of the water pump itself to start rocking it and hopefully breaking it loose.
Yeah also you can bolt the housing back to the engine block so it doesn't move when you hit it
 

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W123 230
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Discussion Starter #9
Thanks guys.

You are correct, the car is a 230, not a 230E, my profile was incorrect and has now been updated!

I think heating with a torch is a good idea, I shall give it a tr over the weekend and report back.
 

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W123 230
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Discussion Starter #10
I had some luck with the plumbers torch and a mallet.

There was so much crud in there but the housing will be fine once it has been cleaned up.
The pump itself is shot, as expected. But surprisingly it does now spin freely once the worst of the muck was scraped out of the shaft.

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I am slightly concerned over where all that crap cam from. The care has been unused for the last 10-16 years, but even still what in the coolant system would corrode that badly and deposited innthe the pump, while the pump itself although damaged looks to be ptetty well free of corrosion?
 

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1985 300 TD 1981 300 SD
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That is definitely nasty, it was pretty much caused by the old coolant reacting with the different metals in the engine while the car sat, you want to do if you can or have someone do a major flush on the cooling system. Just think what could be in the rest of the system.
You know those pictures are a good argument for draining a vehicles cooling system if they're going to sit for lengthy periods of time.
 

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W123 230
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Discussion Starter #12
Relieved to hear that it is a reaction with the coolant rather than some obscure component I am yet to come across giving up the ghost and disintegrating. Will definitely be giving the engine block a good flush, the idea all this much restricting the flow inside the block must be a recipe for disaster.
 

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Discussion Starter #13
Are there any recommended aftermarket manufacturers, ones to avoid, or are they all much of a muchness?

Looking around there are loads available. Started looking at febi bilstein, but that has a plastic impeller, not sure if that is an issue, also looking at Dolz. But there are also many more, SKF I know for their bearings, are their water pumps any good?
 
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