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Old 10-04-2017, 07:53 PM   #1
dbshelton

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2004 5.9 Water Pump

My water pump is leaking after 367,000 miles. I have heard folks using 6.7 pumps on a 5.9. What should I replace it with?
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2004 (early) 2500 2wd QC, 50hp injectors, Holley Black pump, HTS valve body,DPC converter
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Old 10-04-2017, 08:21 PM   #2
QMFB
 
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Both pumps work. The 6.7 pump flows more, but can cause issues at higher RPM without a coolant bypass. If you're stock, and haven't had overheating issues, use the 5.9.
If your stock, and DO have overheating issues, try the 6.7 pump.
If your 5.9 is high performance/ high RPM, stick with the 5.9 pump.
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Old 10-05-2017, 02:22 PM   #3
b.lee
 
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Which ever one you decide, definitely get the OEM Cummins pump. You'll be happy you did.
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Old 10-05-2017, 04:42 PM   #4
WUnderwood
 
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how does the 6.7 flow more? Fin count?
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Old 10-05-2017, 09:11 PM   #5
Red Sleeper
 
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2004 5.9 Water Pump

Quote:
Originally Posted by b.lee View Post
Which ever one you decide, definitely get the OEM Cummins pump. You'll be happy you did.


Have you tried a Gates brand? That's all we run once the OEM Cummins pump weeps coolant.


Second gen 5.9 right. Third gen 5.9 middle. 6.7 left.
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Last edited by Red Sleeper; 10-05-2017 at 09:20 PM.
 
Old 10-06-2017, 06:14 AM   #6
dbshelton

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I went ahead and ordered a Gates replacement. See how that holds up.
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2004 (early) 2500 2wd QC, 50hp injectors, Holley Black pump, HTS valve body,DPC converter
1994 2500 2wd 5-speed RCLB, #5 Plate, 4k GSK, 60# Springs, 035 del. valves.
1996 Ford E-SuperDuty Bus, 1991.5 first gen, 5R110 trans, HE351, 3200GSK, THD pin
 
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