standard, reverse rotation & open water pumps
(clockwise, counterclockwise & bi-directional)
Refer to the belt path diagram under the hood, typically
located on the fan shroud or front fender brace, or locate
the water pump pulleys on the vehicle.
Compare the diagrams below. Water pump pulleys running on
the inside surface of the belt indicate a Standard
Rotation water pump (grooved side of belt).
Water pump pulleys running on the outside surface
of the belt indicate a Reverse Rotation water pump
(flat or smooth side of belt).
Caution: Standard and Reverse Rotation Water Pumps are
not interchangeable.
When the question arises, "Is this a standard or reverse
rotation water pump?", the customer's own vehicle holds the
clearest answer. Under the hood on most late-model light
trucks and automobiles, is a belt path diagram. Locate the
water pump pulley on the diagram (on the front of the engine
if you cannot find the diagram). Simply determine if the
water pump is driven by the inside or outside of the belt.
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