water pump

The labor is 1.1 hours to remove and replace the pump and if you call around you probably can get it done for $250 with a rebuilt water pump. These Cummins diesels cost $6,000 dollars and up to replace, so probably should have a shop repair this and give you a warranty, Not worth taking a chance of not doing it right

Take the old one off first. Then, reverse the procedure to reinstall a new one. That should do it.