*** Why IC Pumps Fail. ***
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Banned
Joined: Mar 2006
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From: Southern California
S600TT, R350
*** Why IC Pumps Fail. ***
In the last several months, I have had to deal with failing IC pumps at least 3-4 times a day, either replacing them or assisting someone on the phone.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
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Joined: Jul 2005
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From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
Why I/C pumps Fail
Vadim ; Nice find , That is what we were seeing on the marine units that are magnetic drive. I switched back to direct drive CO models. CO 90 models are a little noisey as compaired to the Magnetic Drive CM 90. same goes for the other CM 30 types. That is the reason I switched Brand of pumps. Cheers ___PTEngineering
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Thread Starter
Banned
Joined: Mar 2006
Posts: 2,855
Likes: 2
From: Southern California
S600TT, R350
CM30 is rated at 22 liters per minute, stock Bsoch pump is at 15 LPM.
So far have not seen any CM30 failures. CM90 on my C32 went for 120,000 miles and still doing strong on my friend's SLK32.
So far have not seen any CM30 failures. CM90 on my C32 went for 120,000 miles and still doing strong on my friend's SLK32.
Super Member
Joined: Dec 2007
Posts: 557
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From: Surprise, AZ
2005 Crossfire SRT6
Is there any correlation to mileage? The SRT6's had more failures it seemed from not being used and drying up thus cracking. The original owners who bought new and drove them as daily drivers seemed to not have this problem, and if so at much higher mileage. Some of our cars sat for 2 years in Germany waiting for the boat.
The rest is normal wear and tear on that part, unless the internals of the Johnson pumps are designed different I would suspect failure after a year and half of use. This plastic part is subjected to as much strain as the cast water pump.
The rest is normal wear and tear on that part, unless the internals of the Johnson pumps are designed different I would suspect failure after a year and half of use. This plastic part is subjected to as much strain as the cast water pump.
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Joined: Sep 2004
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CLS55 AMG & RRS S/C
wow, thanks for the info in this post!
besides the ecu shutting off the s/c after a couple hard runs, is there any other way to tell if my i/c pump is failing?
just the other day it seemed like my car didnt have as much tq. i didnt do any hard runs though and the temp outside is around 40F. im gonna try to take it out on the hwy tomorrow to get a better feel at full throttle and higher speeds.
besides the ecu shutting off the s/c after a couple hard runs, is there any other way to tell if my i/c pump is failing?
just the other day it seemed like my car didnt have as much tq. i didnt do any hard runs though and the temp outside is around 40F. im gonna try to take it out on the hwy tomorrow to get a better feel at full throttle and higher speeds.
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Joined: May 2007
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From: San Diego
2004 E55
When I installed my CM30 pump I pulled the old Bosch unit apart and mine was still in tact. Though I did not check for cracks, it seemed to be in decent shape. There was a LOT of magnet dust in there though, about half a handful dumped out.
I pulled the old pump apart because I wanted to reuse the connector on it, so it would mate up nicely with the female connector already on the car.
I pulled the old pump apart because I wanted to reuse the connector on it, so it would mate up nicely with the female connector already on the car.
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From: Chicago
Mercedes/ BMW/ Audi
I didn't do anything...
Member
Joined: Nov 2008
Posts: 88
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From: San Francisco, CA
SL65
that is not how my pumped failed. The pump side looked fine, with the exception of a lot of what looked like brush dust. I haven't cracked open the rest of the case yet but i suspect the brushes are completely worn, as they tend to last less than bearings.
My symptom was not complete failure, just very slow intermittent turning. Testing the pump in my sink it looks like it would pump about 1 gallon per hour.
See pics here: http://shapor.com/pics/cars/sl55/icpump/
My symptom was not complete failure, just very slow intermittent turning. Testing the pump in my sink it looks like it would pump about 1 gallon per hour.
See pics here: http://shapor.com/pics/cars/sl55/icpump/
Member
Joined: Nov 2008
Posts: 88
Likes: 2
From: San Francisco, CA
SL65
In the last several months, I have had to deal with failing IC pumps at least 3-4 times a day, either replacing them or assisting someone on the phone.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
Senior Member
Joined: Dec 2007
Posts: 472
Likes: 0
From: Dago, CA
2003 cl55 (sold)
In the last several months, I have had to deal with failing IC pumps at least 3-4 times a day, either replacing them or assisting someone on the phone.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
Mine finally failed as well so I decided to open it up and see what is the cause.
Pump on the right is a good stock one, pump on the left is a bad one. Obviously one can see cracked and fallen apart stator. This also explains why some fail intermittently. The cracks likely to appear slowly and over time get bigger, until complete failure.
Member
Joined: Dec 2008
Posts: 248
Likes: 2
E55 AMG Kompressor
bev
Out Of Control!!
Joined: Sep 2004
Posts: 13,394
Likes: 6
From: San Diego
2015 S212
No pump will add power, but a proper cooling system will maintain the temperature so that the higher temps do not take power away.
I personally like a larger pump, because i want the cooling system to be optimal during all driving conditions. I am also starting to sway from the idea that the CM30 is better even for drag racing, since any pump would be recycling heated coolant between heating up the tires and staging...
Junior Member
Joined: Nov 2008
Posts: 35
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e55
SAME PUMP AS MY FORD HARLEY TRUCK HAS
MY CAR'S FAILED AT ROCKINGHAM/PINKS ALL OUT, POOR TIMING. MY 2003 S/C HARLEY TRUCK INTERCOOLER PUMP RUNS FULLTIME AND HAS NEVER BROKEN. THE INTERCOOLER FLUID IS SEPARATE THOUGH. THINK MERCEDES GETS HOTTER WATER AND BAKES THE PUMP STATOR TIL IT FALLS APART?
