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(Another) Hardin pump issues thread...

Old 06-19-2019, 06:14 PM
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Originally Posted by 14 apache
Do you have a caliper to measure the depth of the stainless housing?? Might be to long.
The depth reads on average 2.08 and if I give the impeller a firm reading it’s pretty much 2.00.



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Old 06-19-2019, 06:22 PM
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It looks like nearly an 1/8” gap. This is the oem Merc impeller. I got a Sierra one laying around and brand new measures even smaller.

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Old 06-19-2019, 06:27 PM
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You have this wear plate in the back of the pump correct?

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Old 06-19-2019, 06:42 PM
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Originally Posted by IGetWet
You have this wear plate in the back of the pump correct?

Nope. That may explain a lot.
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Old 06-19-2019, 07:59 PM
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Originally Posted by IGetWet
You have this wear plate in the back of the pump correct?

Good job on the find.
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Old 06-19-2019, 08:36 PM
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The Hardin email mentioned it, “inner wear plate”. I do have the same pump and thought as I was putting it together how the pump probably wouldn’t work at all if that small piece was missed.
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Old 06-19-2019, 08:47 PM
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I wonder if Brembo has the same problem?
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Old 06-19-2019, 09:07 PM
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Originally Posted by IGetWet
The Hardin email mentioned it, “inner wear plate”. I do have the same pump and thought as I was putting it together how the pump probably wouldn’t work at all if that small piece was missed.
True. In the haste of wrapping up a full rebuild trying to get it wet for the weekend it was missed. I vaguely remember it looking like a scrap blank of some sheet metal punch. OSO braintrust FTW!
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Old 06-19-2019, 09:17 PM
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Originally Posted by ph1971
I wonder if Brembo has the same problem?
I asked him. He said it’s in there. He gets pressure, just not enough, like 15is instead of 30+psi.
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Old 06-19-2019, 10:22 PM
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On to another thing...whatcha all think about the machining on the inside? Seems like it would wear on the rubber a bit.
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