How to Install a High Press Spring in a Small Block Oil Pump

  1. krazykuda

    krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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    krazykuda submitted a new Article:

    How to Install a High Press Spring in a SB Oil Pump

    Read more about this article here...
     
    Last edited: Sep 22, 2016
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    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      Very nice Karl. You are a true asset to the site. Thanks.
       
    • MOPARMITCH

      MOPARMITCH Mekong Gold Member FABO Gold Member

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      Great info there !! Now what about us Big Block guys??. Just kidding, I know how. LOL
       
    • clhyer

      clhyer Well-Known Member

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      That's a great "how-to" Karl,
      C
       
    • Bulldozer

      Bulldozer free ice cream sandwiches

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      yea no kidding LOL

      though it wouldn't hurt to add it here as well

      get out the camera Karl :protest:
       
    • moper

      moper FABO Gold Member FABO Gold Member

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      One thing I'll add - the HV pumps already come with the HP spring... The standard pumps are the ones that need it.
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      Since when?
       
    • Johnny Dart

      Johnny Dart Well-Known Member

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      Very nice write up.

      Have the same question though.

      Is this necessary on the HV Melling pump ?
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      moper said they come with the HP spring. I've never seen one that did OTHER than the Melling HV pumps MP used to sell marketed as high pressure and high volume. MP would take the Melling pumps, disassemble and clearance them then install the high pressure spring package and rebox them as MP HV/HP units. Used many of them through the years. If the regular Melling HV pumps had the high pressure springs in them, it's news to me. Evidently Mopar Performance didn't think they did.
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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      As far as I know the HV Mellings and MP are just the "stock" spring. You have to buy the high pressure spring and install it in the HV pumps. I've been doing it for years...


      The guys at Mancini never stop me from buying the spring when I get a HV pump. Art and Tony would have told me if I didn't, they wouldn't do me that way and they knew their parts. They worked there for many years, and the guys today don't either.... I swear that there have been months that I've spent enough in there to cover their electric bill. LOL!

      We need to research and find out for sure....
       
    • Bad Sport

      Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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      I just spoke with Renee at Melling, since they're 20 minutes from my house, I thought I'd give them a jingle.

      Melling DOES NOT sell the Melling M-72HV with a high pressure spring. They sell the standard volume pump with a relief of 72 and the HV with a relief of 75.
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      That's what I thought. Rich Ehrenberg sells....or used to sell the MP high pressure/high volume pumps I talked about. I bought my last one from him about two years ago.
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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      Then they got two inquiries about this today.

      Thanks for checking Bruce!
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      Yup. The ones I am talking about from MP are discontinued. Rick Ehrenberg used to sell them. They were both high volume and high pressure, just like I described. I don't know why they gotta quit makin all the good stuff.
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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      That seems to keep happening.... :banghead:
       
    • Bad Sport

      Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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      I kinda figured, he said "you're the second person to ask that today". I asked him if it was Karl he spoke to and he said he thought so, you got the same person I did, lol.
       
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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      Not for the Chevy crowd.
       
    • 360moparjunkie

      360moparjunkie Well-Known Member

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      Many thanks Karl. Your time and efforts are greatly appreciated. This site has helped me more than than any single source partially due to those going the extra mile to truly help.
      Darrell
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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      You're welcome.


      Collectively, we have lots of knowledge here and good people who help each other out. That's what makes FABO the best site for Mopar info....
       
    • Mad Dart

      Mad Dart Nothing to see Here!

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      Nice write up! Even a dummy like me can follow your instructions!
       
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      • Retroboy

        Retroboy Well-Known Member

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        Hey all. I know this is an old post but will always be relevant. Why can't I just use the 11 mm socket on the back of the cup trick and tap it in further into the housing and then install a washer between the cup and the spilt pin?
        Cheers
        Tony
         
      • schwinger

        schwinger 1972 Dodge Dart Swinger

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        Awesome how to krazycuda!!
         
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        • moper

          moper FABO Gold Member FABO Gold Member

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          Does a 3psi varience constitute the difference between a std spring and a high pressure one?

          Sticking to the premise of providing information...
          The stock spring will relieve pressure at an indicated pressure of about 55psi. That's regardless of the size of the pump's vanes... A higher volume pump will reach that point much earlier than a std volume unit because it's displacement in one revolution is 25% larger. So it's basic physics. What we interpret as pressure is resistance to flow within a system. The relief valve, being right within the pump itself, will be instantly exposed to any rise in output, and subsequent rise in pressure. Because of that, all HV pumps come with a spring that is a bit stiffer than a standard pump relief spring. Just as Bad notes above. If they didn't, the pump would open the bypass at a much lower rpm, but at the same pressure as a std pump. That's why when you take a worn engine and stick in an HV pump you get 60psi of presssure when the old pump had 35.

          From another perspective - look at the relief springs themselves. The resistance in any spring is a function of the material, wire diameter, and number of coils (length). The one in the stock HV pump has 13.5 coils. There is no picture of the two springs side-by-side, or a standard stock output relief spring, but I'd wager the overall length of the MP one is a little longer, because the MP one has 14, and the stock one will be shorter, made of smaller diameter wire, and have a different number of coils. The two Karl shows are very similar which also jives with Bad's Meliing representative's comments.
           
        • 70 DUSTER CRATE

          70 DUSTER CRATE Well-Known Member

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          Man ! What an informative How to, and with pics. Takes all the second guessing away and written in a way that makes it a good learning experience. The follow up information is also awesome. It certainly helped me out and answered a couple of questions that I had about my own pump. All of the feed back was really good, and it made this a great read. Thanks Guys! Glad I'm on this site.
           
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          • Rapid Robert

            Rapid Robert Well-Known Member

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            this is my first time reading this & that crossed my mind also!
             
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