Posted By: dmerc
Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 11:59 AM
I just bought a new CAT water pump for an earlier model 360. The pump that was sent to me has an impeller that only pumps properly in a CCW rotation looking at the Pulley. The vendor swears they are all like that. Trying to get to the bottom of this.
Posted By: BigDawg72
Re: Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 12:14 PM
It is my understanding that the magnum pumps do rotate opposite from the LA pumps due to the serpentine belt routing. I'm like 90% sure. Maybe someone who is 100% sure will chime in. I used the timing cover and water pump from my LA style engine when I put my magnum block together.
Posted By: dmerc
Re: Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 12:36 PM
Bottom line, I need a CW pump and they sent me a CCW pump. Having a hard time trying to convince them it's wrong. They said send it back and pay a 15% restocking fee along with my shipping cost.
Posted By: dmerc
Re: Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 04:23 PM
Yup, it's the last chinese knock off I'll buy. Ive learned my lesson. I'm going to the Chrysler dealer to see if they can spec a Heavy Duty water pump from say a police car from the 70's.
Posted By: patrick
Re: Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 05:15 PM
most likely will be NS1 or only available as a reman, which most likely will be no different from what you could get at napa, carquest, etc.
AFAIK, there's no special "heavy duty" waterpump, just the 6 blade and 8 blade, and the determination on which to use is determined by application (A/C or non A/C, the water pump pulley is different sized between a/c and non a/c)
Posted By: dmerc
Re: Do Magnum serpentine water pumps run backwards CCW? - 05/14/10 06:21 PM
Patrick, Ive also read that the 8 blade version is has a larger diameter impeller.
