Water pump

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Oct 30, 2011 | 10:33 AM

Randy777

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From: Boulder City, Nevada

Water pump

I have a 2004 and I know that the early models have a weaker water pump. How do I know if I have the larger pump or the older smaller pump. Since I have problems with high delta's after changing the oil cooler I want to make sure I have the large pump.

Oct 30, 2011 | 11:04 AM

npccpartsman

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From: Stuttgart, Ar

If the ICP is under the turbo then unless someone has changed the front cover on the motor you have the small pump.

Oct 30, 2011 | 12:01 PM

rdunagan

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From: Kerrville, Tx

what problems are you having. if you just changed the oil cooler are the ect's rising or the oil temps? if the ect keeps rising you might have cavitiation in the front cover

Oct 30, 2011 | 02:37 PM

Unrealo4

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From: Eagle Mountian, Utah

Trucks built before 9/23/03 have the early smaller water pump. Check your driver side doorjam for your trucks birthday.

Oct 30, 2011 | 09:58 PM

Randy777

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From: Boulder City, Nevada

My doorjamb says 11/3 so I guess I have the larger water pump. I have been thinking about looking at the front cover for cavitiation but wanted to have a larger water pump to install when I take it apart. Coolant temps are fine it is the oil that is driving me crazy. During a recent trip it got to 240 while pulling high grades. The new oil cooler was installed two years ago and did not help very much. I'm thinking of going to the air cooled oil cooler but I wonder if it will do that much better on steep climbs with 11'000 lbs being pulled.

Oct 30, 2011 | 11:55 PM

cartmanea

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From: Corvallis, OR

Quote:

Originally Posted by Randy777

I have been thinking about looking at the front cover for cavitiation but wanted to have a larger water pump to install when I take it apart.

Changing pump size requires a front cover change as well.

Oct 31, 2011 | 05:09 AM

npccpartsman

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From: Stuttgart, Ar

Quote:

Originally Posted by Randy777

You should have the larger water pump. My 10/03 truck does. A two year old oil cooler could easily be plugged again but I would check for cavitation erosion first.

The air cooled oil cooler won't necessarily provide any cooler temperatures but they will be a lot closer. I think the highest I saw this past summer with 110+ ambient was 207 running AC in traffic. Really it's all about how much air goes through the cooler. I can be running 193/193 on the highway, get behind an 18 wheeler, and go to 201/203. When I get out of his slipstream it falls right back down.

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Nov 1, 2011 | 12:13 AM

Randy777

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From: Boulder City, Nevada

I would be thrilled to have your oil temps. I'm really starting to think I should just bite the bullet and install the air cooled oil cooler. When I pull these steep hills in California and Nevada I always have to back off the throttle to keep my oil temps under 240. I have had as much as a 45 degree difference in my delta after climbing steep grades. I know this isn't good and check for oil in my coolant all the time. I'm not sure even a perfecty functioning stock oil cooler would work that well pulling 11,000 lbs up a 12 percent grade at 55 mph. At least with an external oil cooler I would not have to worry about oil getting in my coolant from a ruptured oil cooler.