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Subject: 2n water pump and cooling system

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Steven P Frysinger    Posted 05-02-2018 at 18:48:16 [URL] [DELETE]        [Reply] [Email]  
  • 2n water pump and cooling system
  • Folks, I've just (finally) gotten the water pump off my 2n (had to find a 13/32" box wrench to remove the fan!).

    I'm replacing it because it was overheating, but the bottom hose was cold (suggesting no flow through the pump). I flushed the radiator and water flowed freely out the bottom, so I figured it must be a worn pump.

    But before I put the new water pump on, I wondered if I should flush the coolant channels in the block. Is it likely for that circuit to get plugged? If I should do it, how? Just a hose in the top? Should I put the new pump on first, or wait?

    Yeah, too many questions, but I want to get this right - I need my old friend back in service ASAP!

    Thanks!
    Steve

    JMOR    Posted 05-02-2018 at 18:53:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2n water pump and cooling system
  • how is the thermostat?

    Steven P Frysinger    Posted 05-02-2018 at 19:07:39 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2n water pump and cooling system
  • It didn't have a thermostat in the top hose at all, so that ruled out a thermostat causing the overheating. But I did put a new one in to help it maintain temp in cooler weather.

    JMOR    Posted 05-02-2018 at 21:10:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2n water pump and cooling system
  • After all those years, there will be much deposits (calcium, rust, etc.) in the lower block passages. I flush in both directions at full water hose flow to get as much out as possible, but I have no doubt that more remains than I remove. Do what you can. Sometime a radiator appears OK, but it is only flowing thru perhaps fewer than half the tubes. Feel them when running or if (& that is a big if) you can get a narrow beam IR thermometer you may detect tube with & without flow. IR camera shows what I found. New radiator fixed it.

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