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Self-Priming Engine Cooling Pump Chevrolet Small Block

January 14th, 2011 · No Comments

This pump is designed to mount directly inside the crank-shaft pulley on Chevrolet small block (305 & 350 C.I.) engines. The maximum recommended pump speed (engine speed) is 5200 RPM. The maximum recommended discharge pressure should not exceed 10 PSI. When the pump is installed so it operates at or near maximum speed, the inlet plumbing must be designed to minimize the vacuum at the pump inlet. A high speed scoop over the inlet thru-hull fitting is recommended to reduce inlet vacuum.
To install the pump on the crankshaft pulley, remove all belts that run off the pulley. Remove the bolts that secure the pulley to the vibration dampener.
Note that in addition to the three 3/8″ mounting bolt holes there are two pair of larger 5/8″ locator holes in the pump mounting flange. These locator holes are used to position the pump on Chevrolet engines. Either one or the other pair of locator holes aligns with the two raised positioning bosses in the crankshaft pulley. Generally, the pair of holes located in a counterclockwise direction (viewed from the end cover end of pump) from the alternate pair of holes is used to position the pump on the 305 and 350 cubic inch engines. Usually, the pair of locator holes located clockwise of the alternates is used to position the pump on the 454 cubic inch engine. However, there are occasional exceptions to this general rule so always ensure the pump mounting flange rests flat against the pulley prior to securing it in place. If the mounting flange does not rest flat against the pulley, reposition it aligning the alternate locator holes with the positioning bosses.
Place the pump in the center of the crankshaft pulley with the appropriate pair of locating holes aligned with the positioning bosses in the pulley. Ensure the pulley is properly aligned with the vibration dampener and secure both the pump and pulley to the dampener with three 3/8-24 x 3/4″ cap screws (socket type) machine screws.
Replace all belts on the crankshaft pulley. Attach a torque arm/bracket from the torque arm boss on the pump to a convenient bolt on the engine. This torque arm must not impose a side force on the pump assembly. This could shorten bearing life in high RPM service.
Attach and double clamp the intake and discharge hoses (1-1/4″ ID) to the pump ports. Be sure the hoses do not impose a side force on the pump assembly. This could shorten pump bearing life in high RPM service. Hoses should be flexible and supported by the engine (not the pump). Start the engine and run at low speeds. Check the installation for leaks or vibration.
NOTICE: Failure to install the pump as instructed may result in excessive vibration which can contribute to pump and/or engine damage.


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