How to Save Money When Buying oem pump impeller

Re: Replacing impeller... OEM or aftermarket?

Think of the money you're saving by doing it yourself. If you're going to go through the effort, why not spend the money and get the real parts? Do you really want to do this every year instead of every other year, or worse, do you want to overheat and damage your engine?<br /><br />By the way, you should replace the water pump base while you're in there. It has two shaft seals in it that wear out. It costs something like 20 bucks, so to do all that work and leave the old one in there is crazy...<br /><br />Get a friend to help hold the prop and keep it in gear while you put the gear housing back on.<br /><br />Good luck and have fun with it.<br /><br />Steve

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There are also non-functional advantages to using OEMs, or their authorized distributors, for repair parts:

• Many non-OEMs only offer the most popular repair parts, so that users will still have to deal with OEMs for low volume parts. This sometimes causes the user to miss out on OEM quantity discounts.
• OEMs can offer application expertise, upgrade recommendations and recommended spare parts lists.

Pump Impellers

Impeller vane length, discharge and inlet throat areas, discharge vane tip thickness and discharge vane angle will affect developed head, pump efficiency and possibly the pump NPSHR. Even the way an impeller is deburred and/or balanced can affect pump head and efficiency. The height and angle of the pump-out vanes can affect axial thrust, hence, bearing life, and pump efficiency. Even the stuffing box pressure may be influenced by incorrect height (hence clearance) of back pump-out vanes. Finally, impeller bore tolerance and balance will affect pump vibration and mechanical seal life.

Too thin a vane will reduce its mechanical strength and enlarge the effective flow passageway causing increased flow and horsepower consumption, and too thick a vane will result in a reduced opening between vanes, creating a smaller liquid passageway and an effectively smaller pump (see figure 1). Bumps or irregularities along the vane surface, resulting from improper segmented pattern removal, can cause internal vortices which will block the flow and reduce capacity.

Pump Shaft

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Shafts that are not machined to intended dimensions and tolerances can fail prematurely, reduce ball bearing life, reduce lip seal life, and/or increase vibration. Large radius fillets minimize shaft stress, which reduces the risk of fatigue failures and ensures maximum shaft life (see figure 2). Radius undercuts at bearing fit shoulders avoid interference with the bearing I.D., but again must be avoided in instances where the resulting stress riser effect would mandate de-rating the allowable torque input. Machining marks, inadequate surface smoothness and wear tracks can cause seal leakage. Here, too, experience-based decisions are needed.

Checklist

The following checklist items should be consulted before making critical repair part sourcing decisions:

• Will it affect the warranty & increase liability?
• Does the vendor maintain precise fits?
• Are parts imprecise copies of the OEM parts?
• Do the parts contain the latest design changes?
• Is the metallurgy the same as used for the OEM parts?
• Can the supplier ship parts the same day?
• Can the supplier offer application expertise to solve pump problems, and possibly avoid future failures?
• Lastly, what are the cost and delivery for the part(s).

Reference:

1. Allan R. Budris & Heinz P. Bloch, "Pump User's Handbook &#; Life Extension, Second Edition, The Fairmont press, Inc., WW

About the Author:
Allan R. Budris, P.E., is an independent consulting engineer who specializes in training, failure analysis, troubleshooting, reliability, efficiency audits and litigation support on pumps and pumping systems. With offices in Washington, NJ, he can be contacted via at [ protected].

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