How to do a water pump - 1 Hour on W202 C180

dbanbery

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Okay, so this may be an easy one for a lot of people, but i thought to do a how to would be a good idea for someone who wants to be able to do such jobs on their car, but perhaps isnt confident enough to just go out with a Haynes manual and mess about with it for an afternoon.

Parts:

New waterpump [GSF £30 or £50, Europarts £50, Or Mercedes £££££££££££. i used a cheap one from GSF but the quality seemed fine. i would have got the more expensive one but they were out of stock and i wanted to do it that weekend.]

New fanbelt [check yours, if it squeaks and has cracks in the grooves, thet it changed. £30 ish from mercedes. dont bother with any where else IMHO for this bit, they arent much cheaper anywhere else. save your old one in your boot for an emergency.

Blue Gasket sealant

Threadlock.

Coolant from Mercedes - aparrently this contains particular inhibitant chemicals that other coolants do not. you only need a 2 litre or so container so its worth getting from the stealers.

De-Ionised water. chances are your merc hasnt needed anything doing on the coolant system since birth, so you would want to keep it like new in there. mine certainly was like new. see pics in how to below!

Tools:

standard socket set with 5 - 10mm sockets at least.


Torx drive sockets suitable for a medium sized ratchet.

Hands

the Mrs or friend to stand there and go "ooh" and "is that meant to be like that"




first off, because the engine is longitudinally mounted in most mercs, this job is a doddle for the smaller engined models. i would imagine you would have to remove a lot more items on a C43 [but to be fair, unless you are me if you could afford to run one you probably wouldnt want to get your hands dirty] for example.

okay, so first off, open your bonnet up fully [there are some clips on the hinges that let you extend it higher] and remove your underbody tray.[if you have serviced your car before you will already know and would have already done this] on mine it was 4 8mm [IIRC] washered self tappers. i would also use a large tray to catch coolant [unless you have a means of disposing liquids, i'm not sure they are supposed to go down the drain] we used an old baby bath. LOL

it is your choice if you want to raise the car up, i didnt...

loosen the 4 10mm bolts on the water pump pulley. if its like mine it will have a rusty left handed thread where a visco fan goes. if you have a visco fan you will need to remove that, which as aforementioned is a left handed thread. you would probably need a big spanner. if you dont have th right size spanner using a chisel and a hammer to tap it loose will work too [done that on an E30 before]

remove your fan belt. on mine you put a torx drive on the end of the tensioner pulley and pull it back on its spring. i didnt remove it entirely and looped it over the power steering reservoir [see photo]

06062009307.jpg


then once you have that off, and the pulley that you loosened the 4 bolts on removed, you can get to the pump.

remove the hoses for the waterpump by loosening the jubilee clips. i always use a 5mm and 7mm socket rather than a screwdriver on these. note when they are loose and leaking twist them behind something suitable as shown in the pictures:

06062009305.jpg


06062009306.jpg


there are about 6 or 8 bolts on the pump [use the new one for reference where they are] that are two torx head sizes on mine. cant remember the sizes but if you want to buy the tools you might as well get a set of sockets rather than the individual stuff. Halfrauds or Machine mart is the way forward [i love machine mart.... like a woman in a shoe shop in there]

once they are removed, you should be able to crack the pump off by grabbing the big extened pipe thing and twisting/pulling it off. it will come off very easily. after its off, you should be able to see the condition of the impeller. mine wasnt too bad, it looked like new but had a bit of a squeak on it. directly comparing the GSF one to the old one i coudlnt see an immense amount of difference in quality at all tbh. see pic:

06062009308.jpg


before putting the new one on, make sure you remove all the residual gasket off the engine block using the stanley knife blade. it should look like this:

06062009304.jpg



smear your blue gasket sealant thinly but evenly around the mating surface, affix your gasket, wipe off excess stuff, and apply the same thin amount of blue to the pump. then fix it in place. refitting is the reversal of removal.

06062009309.jpg


once its all back together and tightened up nicely, you will need to refill with coolant/deionised water.

once you have filled it to the max line, start the car up and let it run with the radiator cap off, until it starts to get warm. it should start to swirl in the bottle, and while you are waiting i'd give the pipes a bit of a sweeze to get the air out. run it till it gets a bit arm [like its been in traffic for a while] and keep topping it up when needed. once the coolant is staying at a constant level and the blowers are blowing hot etc you are sorted. stick your tray back on, check you havent forgotten any bolts/parts and take her for a drive to check everythings okay.

then you are done! go have a beer.
 

coventryslk

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SLK belts

This may sound like a totally stupid response, but it looks too easy to do - the belt replacements for my M111 r170 200k is basically turn the tensioner pully using a torx drive to loosen the belt as its a self adjuster and remove??? same with the supercharger belt?

My belts are ok, but just to be over the top im gonna change them.....
 
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dbanbery

dbanbery

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This may sound like a totally stupid response, but it looks too easy to do - the belt replacements for my M111 r170 200k is basically turn the tensioner pully using a torx drive to loosen the belt as its a self adjuster and remove??? same with the supercharger belt?

My belts are ok, but just to be over the top im gonna change them.....

I was amazed at how easy it was to be honest. Yes it sounds too easy but thats all i needed to do on mine to take the belt off. The SLK may be different, but i dont know as i have never worked on anything else newer except my dads W203. and that is the same IIRC. you may need to remove plastic covers first though.
 

Jamesie

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Any chance of you re-posting the photos please mate?

Thanks

Jamesie
 
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dbanbery

dbanbery

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hiya,

do they not work?

they seem to work on my machine..
 

television

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I have asked for your post to go in the DIY
 

Uncle Benz

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The top right pump bolt (as you look at it) is much longer than the others, and often feels like it is going to snap. If you work on a warm engine it minimises the risk of that happening. (In my experience!!)
 

furto

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Hey i recently heard a weird noise from under the hood of my w202 c180 and i traced it to what i thought was the water pump so i came here to see how to fix it, but it appears that what is making the noise is a different part to the one you are replacing in this guide!

Can you tell me what this thing is/what it does because it sounds like it needs replacing :p

06062009307.jpg
 
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dbanbery

dbanbery

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are you sure its that? i think that is the thermostat housing, and i dont think it is supposed to have any moving parts. are you sure its not the power steering pump? that is nearby..

is it running hot?
 

furto

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The car seems to be running fine, i only noticed the noise because I had the car running while I was fixing my windscreen wiper :p

Perhaps the noise is travelling up from the water pump? I might try and upload a video a bit later.
 

television

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I wonder if the noise is not being caused by the idler wheel that sits just below the thermostat,,,this is a common fault
 
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dbanbery

dbanbery

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got it sorted, i'd be inclined to go with what malcolm says about the idler being to blame. cheap fix too IIRC
 

gogsey3

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mercedes w203 water pump

Hey guys, I have a 2004 53 plate c220 cdi and I was wondering if anyone out there could tell me how easy (or hard) it is to change the water pump on this,:D
 
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dbanbery

dbanbery

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not really much harder, i think you need to remove more cowlings etc but its a similar affair. i think the tensioner is a similar setup.
 

television

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Hey guys, I have a 2004 53 plate c220 cdi and I was wondering if anyone out there could tell me how easy (or hard) it is to change the water pump on this,:D

I can print you off a guide on how to do this job
 
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dbanbery

dbanbery

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christmas GTG on my bday!!!
 
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dbanbery

dbanbery

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i know. but then again you will live down in cider drinking farmer country rather than the harrowing north LOL ;)
 

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