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Thread: Oil pump recommendation

  1. #1

    Default Oil pump recommendation

    As I mentioned in a prior post, the oil pump on my '48 Chief (aluminum) is wet sumping something awful and I don't want to take a chance on a weak and worn pump. I will replace it. There are several variants on the market. Kiwi's has a high output modification and is tested. Starklite sells high capacity gears but I'm not sure if they are in the new pump he sells. And Greer always sells good stuff. Does anyone have any recommendations between these (or others), and why? PM me if necessary. Thanks!

  2. #2
    Join Date
    Oct 2011
    Posts
    479

    Default

    Because its standing wet sumping that doesnt necessarily indicate a weak or worn pump.If it was wet sumping while running that could indicate a worn return pump.
    In my opinion high output is not necessary.These pumps supply and return very well.The wet sumping in storage is a design issue with no seal on the pump shaft and removal of the ball valve.A new pump without the ball valve will do the same.I personally believe the cast iron pumps are better.They have bigger return gears,cast iron housing instead of aluminum,no tiny keys to shear,and with a good fitting plunger very little wet sumping.
    Sorry I have no experience with modified or aftermarket systems.
    Tom

  3. #3
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    4,291

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    Don't forget "tuning" the scraper, Folks!

    ....Cotten
    PS: Nah, just throw money at it.
    Last edited by T. Cotten; 10-03-2019 at 06:27 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  4. #4

    Default

    Are there any posts you can point me to on tuning the scraper?

  5. #5
    Join Date
    Aug 2019
    Posts
    26

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    I don't know, but I found this on Professor Jim Moshers Performance Indian cite:

    http://performanceindian.com/Oil%20P...0Scrapers.html

    Oil Pump & Scrapers

    "A "scraper" as used in the 1947 Chief was a good upgrade from the original sump casting used from 1932
    through early 1947. The scraper is a flat 1/4" plate with a contoured blade behind it that sits very close
    to the outer edge of the rotating flywheels. It's job is to "scrape" off any excess oil from the flywheels
    when the motor is running. It doesn't actually scrape the flywheels, but rather sits about .015"-.020" off
    the edge (just enough to capture excess oil). The scraper blade is cocked at an angle, which helps to direct
    the oil now sitting in the bottom of the crankcase toward an oil fitting that the sump tube connects to.
    It is a simple system that works really well. The scraper is not restrictive, so an oil pump that has sat
    for a length of time has no trouble picking up oil to return to the oil tank. I use a 1947 Scraper on ALL
    bottom ends for Scouts, and Chiefs prior to 1947. In 1948, the Chief had this scraper cast into the cases,
    and there is only the threaded hole for the sump line fitting. To install a scraper to an older Chief, or
    Scout, there is a little trimming needed to the sump hole, and at the very bottom of the case joint, so the
    scraper can make it over to the left side wheel. Be very careful to not trim out too much metal, or the
    scraper gasket might leak!"

    As your Chief is a 1948 (CDH) and as per cited expert "In 1948, the Chief had this scraper cast into the cases"
    I would wonder/question IF there is a scraper for you to "tune". As I stated at the start I don't know but I am
    confident that the Senior members here do.

  6. #6
    Join Date
    Aug 2019
    Posts
    26

    Default

    Or perhaps the question is better stated:
    Can a casted scraper be "tuned" without out splitting the cases?

  7. #7
    Join Date
    Jun 2001
    Location
    Central Illinois, USA
    Posts
    4,291

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    Quote Originally Posted by PaulCDF View Post
    Or perhaps the question is better stated:
    Can a casted scraper be "tuned" without out splitting the cases?
    Good question, Paul!

    Better add 'safely', before somebody suggests JBWeld.

    ....Cotten
    PS: My test bench is up for trade.
    I'll never use it again.
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    Last edited by T. Cotten; 10-26-2019 at 09:51 AM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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