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Water Pump Failure - next steps

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    Water Pump Failure - next steps

    Recently had a catastrophic water pump failure, working on getting it cleaned up and repaired. I’ve found some old forum posts on other sites talking about it, thought I’d ask here for some current opinions.

    Had the bearing fail and blow apart. After tear down I found that the plastic impeller also decided to blow apart.

    I’ve found most of the impeller plastic but am still missing ~2.5 fins from what I can piece together. I’ve tried using a garden hose to force a flush for a few minutes in either direction of the block (top down first) as well as the radiator. Nothing came out during that process. Is there anything else that can be done? I have a buddy who will lend his camera to scope either end of the radiator to check for blocks. After inspecting that would it be fine to go with a new pump and accompanying cooling system parts or is this going to require more tear down? The missing plastic is going to be a worry for me I feel.

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    2005 ///M3 6MT Coupe Imola/M-Texture



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    #2
    That is unfortunate. Out of curiosity how many miles on the pump?

    As for a blockage, the risk is relatively low. The biggest issue IMO is if one of the pieces dislodged and recirculates, damaging the new pump. I don't have a good recommendation, but I wonder if it would be unreasonable to install some sort of coarse mesh "filter" on the inlet to the pump just in case a piece some day comes loose and finds its way there?

    Did you check the thermostat for broken pieces?

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      #3
      No records of it being replaced so 113k. Failure is ultimately on me, I know I was risking time and I've normally been good about preventative maintenance under my ownership. This one just skipped past.

      Nothing found in the thermostat or thermostat housing. All the bits I found were containing to the water pump/pump housing itself.

      Luckily the cooling system isn't that hard to replace, more of an annoyance if it happens again.
      2005 ///M3 6MT Coupe Imola/M-Texture



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        #4
        For what it's worth, I had a similar failure a couple months back (https://www.instagram.com/p/C4JHdswp53j/)- no issues over the past couple thousand miles I've put on it since.
        2002 TiAg M3 Coupe (SMG to 6spd), 2003 Jet Black M5

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          #5
          I'd guess it went through the radiator or into the expansion tank if it went anywhere. Maybe try blowing compressed air through the cylinder head pipe - that way might blow out anything that is stuck through the block.

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