For what it's worth, I just got a CAT water pump for my 360 engine and it has an impeller designed for CCW rotation(looking at the pulley end.) If you spin an impeller backwards, it will pump fluid but at a reduced rate. I'll be sending this pump back. See the attachment. Maybe Doug is having the same problem?

5979910-rotate.gif (106 downloads)
Last edited by dmerc; 05/13/10 06:51 AM.