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Water Pump Hub Distance Help

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  • Mike B.
    Expired
    • November 1, 2004
    • 389
    #1

    Water Pump Hub Distance Help

    Gentlemen,

    I just received my water pump back from the rebuilder. Unfortunately I realized after mounting that the hub was not pressed back far enough on the shaft and the pulleys now do not line up. I do have the 1/8" harmonic balancer spacer in place but the water pump pulley is too far forward by about 3/16". This is before I install the reinforcement spacer between the hub and pulley which will further widen the gap. To be fair this was a replacement pump found at a swap meet that had never been on the engine. I did not take the time to test fit it beforehand and just assumed...

    I will take a series of empirical measurements so that I can instruct the rebuilder the press the hub back in further. But can someone provide a sanity check on the distance say from the front of the hub to the mounting flange faces or some other fixed point? The pump is a "609" for a 1961.

    Also so that I can be extra sure, can someone also provide the height of the water pump pulley? I thought mine to be correct but it now realize there are no numbers stamped on it. I want to check that the offset is right.

    Thanks in advance.

    Mike
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    • Bernard M.
      Expired
      • August 31, 1994
      • 341
      #2
      Re: Water Pump Hub Distance Help

      Mike, I thought I might be able to help but after measuring, I'm not so sure. I just took two rebuilt water pumps off my shelf and measured them. Both are 1956 3704911 castings, both are professionally rebuilt. I set them on a flat metal surface and placed a metal rule across the top of the fan pulley mounting surface. I put another metal rule on a 90 degree welding magnet to keep it vertical and measured the height of each. One measured 5-9/16 inches, the other 5-11/16 inches. I guess before I use either one, I'll check it against the one I'm replacing and adjust as required. Sorry I couldn't give you consistant measurements. Maybe if someone else can confirm one or the other measurement, it will help. Regards, Bernie Myers
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        • John H.
          Beyond Control Poster
          • December 1, 1997
          • 16513
          #3
          Re: Water Pump Hub Distance Help

          My notes show 5-9/16" is correct for '55-'70 SB water pumps.
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