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Old 07-25-2012, 02:36 PM
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Water pump rotation

I changed my "34 ford street rod from a two v-belt system to a serpentine belt. Now I am having overheating problems at low speeds/idle. The engine is a 302 with a 351 cam out of a mustang from the late 60's ('68 I think). I am running power steering, AC and an electric fan. I kept the water pump and timing cover from the early engine with the fuel pump boss on the driver's side. As I look at the belt driving the water pump it appears that the pump now has a counter clockwise rotation where the v-belt original had a clockwise rotation. If this is true then I need to replace my water pump with a reverse flow model. Is there one that will fit on my timing cover so I can keep my mechanical fuel pump or ...? Is there a different way to route my belt so I can keep the pump I have? The water pump pulley does not have any grooves and the belt runs across it on the back (smooth) side. Could it be slipping on the pulley and be stopping while the engine is idling? I am planning to make a run to California on Route 66 and I really need to get this over heating problem solved soon. Thanks in advance for any help you can provide.

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Old 07-25-2012, 02:44 PM
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The usual rule of thumb for water pump rotation is if the pulley is smooth it rotates counter clockwise. If it is ribbed it rotates clockwise.
If the later water pumps that came on serpentine systems are no different in design just simply bolt on the new pump.
Explorer 5.0 Serpentine Accessory Drive Belt Conversion | ClassicBroncos.com Tech Articles
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Old 07-25-2012, 03:22 PM
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Originally Posted by dialh View Post
I As I look at the belt driving the water pump it appears that the pump now has a counter clockwise rotation where the v-belt original had a clockwise rotation.
And this is why water pumps for serpentine drives are different from those for normal V-belt drives...
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