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Old 05-16-2018, 08:29 PM   #1
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Coolant Leak at waterpump

I have a leak at what appears the water pump. I am wondering if anyone has found that a seal can be replaced or if the entire pump needs replacing. I have:

2010 ISB Cummings 340 on Freightliner.

Also, on ISB I understand the coolant is dry system and only requires 4895 approved coolant. I have been adding Prestone while it has been leaking and still trying to figure out if I need to drain and refill with something specific that is recommended by Cummings. A very strange range of online recommendations. Called Freightliner and they told me 50/50 ethanol glycol would work. But now that I wonder if I need to recharge with OEM recommended Fleetwood.
Thanks for any input!
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Old 05-16-2018, 08:36 PM   #2
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The ISB is a parent bore engine, it does not need normal diesel coolant nor SCA's like wet liner engine (ISC and larger) does. It won't hurt to use regular diesel coolant with SCA's though.
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Old 01-10-2019, 06:42 AM   #3
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A delayed thank you. I ended up getting the pump replaced. Guess what. I still have a leak after the new pump was installed by a qualified mobile diesel mechanic. Now its at Cummings Orlando and they say its leaking from the weep hole and needs another waterpump after only 3500 miles. I had to add another gallon recently. Any chance its another problem and I never really needed the new pump? Seems odd. It was a Carquest pump and not Cummings and at the time I did not have time to get OEM. Thoughts?
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Old 01-10-2019, 06:54 AM   #4
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I am not a cummins guy but I have changed many water pumps at my place of work and the car quest pump is most likely just a chinese piece of junk like everyone has for sale. Getting a OEM pump from cummins will be the best choice, yes it will cost more but the rig you have is for long haul trips and who wants a break down in the middle of nowhere.
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Old 01-10-2019, 08:28 AM   #5
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I would have never let this pump on board, but I had limited options. The cost of labor far exceeds any additional cost of a pump. I told they guy I wanted OEM but he said he could not source it quickly. Why would anyone that would spend 4 hours installing not insist on OEM parts. It would only be about 50 dollars more. Should have made him go back and get one!
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Old 01-10-2019, 03:05 PM   #6
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Hi Deas; Been there and done that! Yes I agree with the other posters who responded. In 2016 I need to replace the WP on my 99 Ford SD truck with the 7.3 diesel. Started researching and found most of the replacements at auto parts stores, including NAPA, were from China. I said, no way, even with a life time warranty. You still have to take it back when it craps out. Finally got a Motorcraft from Rock Auto. Even with OEM, you have to ask to see where the parts are made. A lot of people behind the counter don't know. Sorry you have to go through this. I hope things work out in your favor.
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Old 01-11-2019, 03:56 PM   #7
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Quote:
Originally Posted by deasnealy View Post
I would have never let this pump on board, but I had limited options. The cost of labor far exceeds any additional cost of a pump. I told they guy I wanted OEM but he said he could not source it quickly. Why would anyone that would spend 4 hours installing not insist on OEM parts. It would only be about 50 dollars more. Should have made him go back and get one!
Given you scenario I would flush the system and recharge with your choice of OAT or SCA

Something seems wrong as I have used Chinese pumps in a pinch and they lasted for years, albeit you can get a bad anything as many of you know
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Old 01-11-2019, 04:03 PM   #8
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Pump seals fail when they wear out of course but they can fail earlier due to mineral build up, higher temperatures than design, excessive vibration, and even dropping a pump on concrete or steel hitting the shaft might crack the seal. Second water pump back to back, flush for darn sure and prior test the coolant to see what you have regarding SCA's, color, turbidity and so on
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Old 01-11-2019, 04:54 PM   #9
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Quote:
Originally Posted by Mr_D View Post
The ISB is a parent bore engine, it does not need normal diesel coolant nor SCA's like wet liner engine (ISC and larger) does. It won't hurt to use regular diesel coolant with SCA's though.
Right you are. Just get the regular green stuff a walmart. ISB doesn't care.
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Old 01-12-2019, 06:09 AM   #10
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It was flushed just before the leak by Gaffney Freightliner. It is my understanding the ISB does not require regular Diesel coolant. However, a new round of coolant might not be a bad idea. On the first repair they pumped most of the coolant back in with a new gallon added. I have added another gallon since.
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Old 01-12-2019, 09:24 AM   #11
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It was flushed just before the leak by Gaffney Freightliner. It is my understanding the ISB does not require regular Diesel coolant. However, a new round of coolant might not be a bad idea. On the first repair they pumped most of the coolant back in with a new gallon added. I have added another gallon since.
Given the flush and if the coolant looks clear with no debris or oil and so on it might be ok. We used to keep a 10 micron filter and use a lot back into tractors and most had SCA's and coolant filters so a bit different.

The main difference in all the antifreeze out there is the type of inhibitor methodology utilized. Longer interval with the OAT and not having to test for SCA's is the primary advantage.

I feel for you having to change another pump that quick, makes you wonder what the heck happened
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Old 01-12-2019, 09:35 PM   #12
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Coolant never wears out, the additives do. Coolant may be re-cycled through a machine that replaces depleted additives after being filtered. When the old coolant was simply "poured back in" they returned any contamination back into the cooling system without testing for required additives.
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