C32 AMG, C55 AMG (W203) 2001 - 2007

Replacing Bosch IC pump with Johnson C030

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Old Aug 20, 2007 | 07:38 PM
  #1  
Vadim @ FD's Avatar
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S600TT, R350
Replacing Bosch IC pump with Johnson C030

I just had a chance to replace Bosch pump with Johnson. I was going to put together a kit to make it easy, but in all honesty it is very straight forward swap that does not require any special adapters or tools.

Here are the pictures:

1. Stock Bosch Pump.


2. Johnson is smaller physically, but delivers 50% more flow (22.5 L/min vs 15L/min).


3. Simply bolt Johnson pump to the factory bracket.


4. Here is what it looks like on the car. Connector was just spliced.


5. Here is data before and after - same route, just about the same ambient temperatures - 90F vs 92F. Both pumps cool about the same, if anything Johnson is about 10F cooler.

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Old Aug 20, 2007 | 07:42 PM
  #2  
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thanks for the DIY!
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Old Aug 20, 2007 | 08:02 PM
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great DIY vadim.

one more stuff to add to my list in the future.
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Old Aug 20, 2007 | 08:53 PM
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probably going to do this to my E55...

thanks for the write up.

I think it would be best if someone can find the right connector. I did on my C32, but I had to search a "pick your part" store for it.

splicing works too, but having a connector would make it a nice clean job.
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Old Aug 20, 2007 | 09:11 PM
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btw, how do you tell which is + and which is - when you splice the wire from the car?
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Old Aug 20, 2007 | 09:55 PM
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Red is positive, brown is ground.
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Old Aug 20, 2007 | 09:57 PM
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where can we order this pump from? Thanks
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Old Aug 20, 2007 | 10:13 PM
  #8  
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will the CM30 work?

http://cgi.ebay.com/ebaymotors/Magne...em200141033580
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Old Aug 21, 2007 | 12:16 AM
  #9  
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Originally Posted by rlee02135
thanks for the link! i just ordered one....
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Old Aug 21, 2007 | 01:24 AM
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yes, same question, where can we order the pump from?
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Old Aug 21, 2007 | 12:14 PM
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Originally Posted by Vadim@GMGRacing
Red is positive, brown is ground.
Vadim, thanks for the great info, as always.

One q: is it possible to dismantle the old pump in such a manner that would allow for the connector to be reused? Thanks!
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Old Aug 21, 2007 | 12:33 PM
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CLS55 Designo 030
Great DIY! Thank you.

Post #168... Will this connector work?

https://mbworld.org/forums/showthrea...=146457&page=4
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Old Aug 21, 2007 | 01:11 PM
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Thank you guys!


One q: is it possible to dismantle the old pump in such a manner that would allow for the connector to be reused? Thanks!
You will have to disassemble the pump and cut out the connector and than splice it into Johnson pump.
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Old Aug 21, 2007 | 03:15 PM
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Originally Posted by Vadim@GMGRacing
You will have to disassemble the pump and cut out the connector and than splice it into Johnson pump.

Cool. That's what I'll do. I just wanted to make sure it could be disassembled without destroying the connector.
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Old Aug 21, 2007 | 04:17 PM
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Originally Posted by Magician
where can we order this pump from? Thanks
any body have a link to where we can order these pumps. Thanks
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Old Aug 21, 2007 | 06:38 PM
  #16  
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Fantastic ....... thanks for the consistent great advice Vadim ......

Any chance you could show some piccies on how to wire it up so it runs all the time when the ignition or engine is on, so the computer doesn’t turn it on/off when it thinks it needs to ?
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Old Aug 21, 2007 | 06:49 PM
  #17  
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Midnight Blue 2004.5 C230 Kompressor Sport Sedan. 2002 w210 E320, 2009 w211 E350 Sport
Originally Posted by Magician
any body have a link to where we can order these pumps. Thanks
This is the US Distributor for the manufacturer:
http://www.johnson-pump.com/JPMarine...tion/cmco.html
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Old Aug 21, 2007 | 06:53 PM
  #18  
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Any chance you could show some piccies on how to wire it up so it runs all the time when the ignition or engine is on, so the computer doesn’t turn it on/off when it thinks it needs to ?
I do not have pictures handy, but it will be very easy to do. Simply run the red wire to any of the fuses in the fuse box, that are on when key is in position 1. Pump only draws 2 amps, so most circuits can handle it, or use a relay.
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Old Aug 21, 2007 | 09:24 PM
  #19  
Magician's Avatar
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other than e-bay, this is the lowest price ive seen so far

http://www.autoperformanceengineerin...ml/jabsco.html
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Old Aug 21, 2007 | 09:40 PM
  #20  
Magician's Avatar
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From: Whorelando
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$84 shipped, 7 left after I get mine....

http://cgi.ebay.com/ebaymotors/Magne...QQcmdZViewItem
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Old Aug 21, 2007 | 09:55 PM
  #21  
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Hmmm, I wonder if this will help on my car.
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Old Aug 21, 2007 | 10:12 PM
  #22  
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Looks like this is the end of the Lightning pump replacement. That's ridiculously cheap.
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Old Aug 21, 2007 | 10:19 PM
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Vadim, is it CM30 or C030 or was that just a typo in the title. lol
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Old Aug 21, 2007 | 11:10 PM
  #24  
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Originally Posted by Magician
...7 left after I get mine....
One less now. CM30 FTW.
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Old Aug 21, 2007 | 11:16 PM
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Originally Posted by splinter
One less now. CM30 FTW.
One more less...LOL
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