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2003 ML500 2002 S430
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65 Posts
Discussion Starter #1
Guys its the lower of the two with the four bolt arrangment. It is wobbling (oscillating about its verticle/horizontal axis).

Is this the water pump pulley?

What do you suggest that i do? I have taken the day off from work to take care of this, I would appreciate any suggestions.

Thanks so much! Pete
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #2
Hey guys, Evidently it is the water pump pulley, I think. Can I change just the pulley or will I need a pump too?

Thanks again. Pete
 

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'07 C280 4matic, '06 530i, '98 ML320
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1,562 Posts
I suggest you remove the belt from the pullies and spin the water pump pulley. Then remove the water pump pulley (by removing those 4 small bolts) and then spin the shaft for the water pump. If you feel any looseness or wobble/squeak, buy a new waterpump.

Waterpump is not that difficult to change. RMeuropean and Autohaus carry water pumps for reasonable price.
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #4
Thanks so much, I also noticed the shaft is turning true. just the pulley is out of line.

I will check it today.

Thanks again, Pete
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #6
Thanks so much guys,

Does anyone know where I can find a DIY on the pump/pulley change?

Any good places to get a pump/pulley?

Thanks, Pete
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #7
Guys does the tensioner have a tamperproof torx??

I thought I read it was a socket? I'm trying to pull te belt now.
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #9
Ok I was able to remove the belt by just sliding it off the wp pulley. Looks like it's the pump thats bad the pulley looks fine to me can I reuse it?

Can someone point me to directions to installing a new pump? Does the fan/shroud have to come off? What type size bolts hold the pump on?

Thanks in advance, Pete
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #10
Thanks for for the diagram, Just one last question. Is my WP a 2 or 3 hose conx?

thanks, Pete
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #11
Sorry I lied about the last question thing.

I would just like to know is it necessary to remove the fan. Ive read about removing the pump both with and without removing it..
 

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2003 ML500 2002 S430
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65 Posts
Discussion Starter #15
Guys would this happen to be thew one?

Dont know about a 76 dollar pump though..

[ame]http://www.amazon.com/Mercedes-Cooler-1122001401-1122000401-11220000110/dp/B003523V6U[/ame]
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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7,035 Posts
Get a Graf water pump for $150.. rebuilt or China knockoff not the best decision.
 
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