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It is true that the water pump is a pain to remove. However, I did it without removing the fan pully or the harmonic balancer. The bolts were tough enough to get out with all the extra stuff in the way, Hind sight I wish I had removed at least the fan. But when you don't have the right tool, you jimmy rig it.

I did not need to lock the flywheel, as I didn't need to remove the harmonic balancer. To get the bolt off that was just under the edge of the harmonic balancer, we used a torch to make a small notch just big enough to get a wrench in there and loosen it off.

Then Entire job took 3 hours, plus a little extra for a few beers. ALl in all the job was worth doing myself because the dealer wanted about 700.00 for labour alone. I had to pay 280cnd for the pump itself. But, where else are you going to get it.

the pump iteself can be unbolted and might be able to repair the seal. I have not tried this yet, but I am sure it is possible.

Hope this helps!

If you have to ask, you don't know enough. See a pro.

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Q: How do you remove the water pump on a duramax?
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