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  1. #51
    Join Date
    May 2007
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    Auckland
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    Re: Mycom WA oil pump



    Hi Ranger 1,
    I think that you being very astute type bloke, your initial observations between new and old pump bearing assemblies- you would have spotted the groove milled in the old bearing assembly. From an old head/memory there were not any, either lineal grooves or radial ones. Correct me if I am wrong. They were originally ferrous bronze type sleave bearing, possibly the bearing content material content has metalurgically changed with the upgrade coc up. There is nothing like spinning tales to protect from warranty potential costs.



  2. #52
    Join Date
    Dec 2007
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    australia
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    Re: Mycom WA oil pump

    Magoo,
    I don't remember any grooves in old pumps, but have to admit i don't look at them everyday.
    One old pump I had reconditioned has a groove on both sides, as these pumps are bi-directional if you turn them half a turn in housing. This pump is going OK but it has 650 kpa at start of oil circuit, not 1900 kpa like new ones.
    The shaft diameter in new pump is also a little bigger, so not much going for it.
    It would be like a bigger balance piston on a screw compressor, more sufrace area, more pounds per square inch force.

  3. #53
    Join Date
    May 2007
    Location
    Auckland
    Age
    74
    Posts
    3,362
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    37

    Re: Mycom WA oil pump

    Hi Ranger1.
    I agree, the high pressure and balance piston effect is the problem. With the new pumps is there any mods required for the sweap/blade filter after pump to reduce pressure at pump. Like less plates in filter, just thinking out load. With the extra flutes on new pump rotor it will pump more oil and pressure. I like the idea of spilling pressure to sump to get back to 6>7 bar at pump.
    magoo

  4. #54
    Join Date
    Jan 2008
    Location
    West Coast British Columbia
    Age
    50
    Posts
    106
    Rep Power
    17

    Re: Mycom WA oil pump

    Quote Originally Posted by Magoo View Post
    Hi Ranger 1,
    I think that you being very astute type bloke, your initial observations between new and old pump bearing assemblies- you would have spotted the groove milled in the old bearing assembly. From an old head/memory there were not any, either lineal grooves or radial ones. Correct me if I am wrong. They were originally ferrous bronze type sleave bearing, possibly the bearing content material content has metalurgically changed with the upgrade coc up. There is nothing like spinning tales to protect from warranty potential costs.
    Wow Really Mango. I thought you were a VIP here someone who is here to solve things not call me a crook or Dishonest to try and get out of costs. Wow remind me to stay away from your threads. Try and shed some light and get attacked

    For the rest of you still interested in moving forward with info

    I have attached some pictures of the new bearing with no grove and the old one showing the groove in the e bearing


    New bearing.jpg

    Bearing groove.jpg
    Last edited by IceMan_4000; 05-03-2012 at 08:20 PM.
    Refrigeration is not just cool, it is my life.

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