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  1. #46
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    tunna have you got a 20 mm plug there don't go by size because thew plugs are made to squeeze down and are actually bigger than 20 mm


    zok
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  2. #47
    Do you ever leave? Hqtunna4me's Avatar
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    i measured the plug, like HPE pete's pump, hole is 20.4 plug is 20.2 . Dont mean to sound rude but im not stupid. I know how to use verniers. 20mm plug will never fit the 2 pumps i have. Needs a 21 mm plug, simple. Just seeing if others have found the same thing.
    A minute of thinking can save hours of doing

  3. #48
    Do you ever leave? Hqtunna4me's Avatar
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    Quote Originally Posted by zok race carbs View Post
    the steel pumps and aloys have different sizes i have 21 mm plugs pm me your address and i will send you one since i stuffed you up with the tap

    zok
    i appreciate that, strange thing is one pump is steel the other alloy. they are both 20.4mm.
    A minute of thinking can save hours of doing

  4. #49
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    Guys guys guys - now we all know the metric system will never take off in this country so why are we even talking metric for a hole that is clearly imperial ?
    The plug you need to buy for this mod is 13/16" which is .8125" or iff we really must 20.637 mm which could possibly measure closer to 21 mm becuase, as Zok said - they are designed to squeeze down.
    Last edited by Mickss355; 05-10-2013 at 04:36 PM.
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  5. #50
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    Quote Originally Posted by Hqtunna4me View Post
    20mm welch plugs do not fit any of the oil pumps i have. First one i tried was an original pump. Popped out the bypass, grabbed a 20mm plug falls in and out. measured the bypass valve 20.4mm. New plug measures at 20.2 that was my practice pump. opened up the brand new jp standard pump. exactly the same as the original, bypass is 20.2mm. anyone else come across this problem? Tk says he uses 3/4? i seem to need one which is 13/16. Whats the go here?? Only thing i can come up with is you guys are knocking it in past the lip the bypass usually goes in to. which wouldnt seem right to me. Yes its the right hole, and yes ive measured with 2 set of verniers.
    I did at the start actually
    A minute of thinking can save hours of doing

  6. #51
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    Quote Originally Posted by Hqtunna4me View Post
    i appreciate that, strange thing is one pump is steel the other alloy. they are both 20.4mm.
    as Pete discovered today there is a third size , i will send you one on Tuesday since Monday here is a pubic holiday


    zok
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  7. #52
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    I only used 21mm as they didn't have 13/16th. 21mm is an extremely tight fit.

    Sent from my LT18i using Tapatalk 2

  8. #53
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    would i be mistaken that some guys may be putting the plug in the hole that the bypass counterbore/step is machined in to.....so not the bore where the bypass is pressed in to but the hole itself.....if you look at tk,s pump it kinda looks like its in the hole, could be wrong though

    this doesnt apply to zok by the way i know he pesses it in to the counterbore where the bypass seats

    the counterbore has a step at the bottom so the plug cant go through any further from the pressure side

  9. #54
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    Quote Originally Posted by HPE PETE View Post
    would i be mistaken that some guys may be putting the plug in the hole that the bypass counterbore/step is machined in to.....so not the bore where the bypass is pressed in to but the hole itself.....if you look at tk,s pump it kinda looks like its in the hole, could be wrong though

    this doesnt apply to zok by the way i know he pesses it in to the counterbore where the bypass seats

    the counterbore has a step at the bottom so the plug cant go through any further from the pressure side
    I went through the counter bore side. Seated hard against the lip. Had to cut the bucket shim to clear a path to the oil press sensor though as the shim was to thick.

    Sent from my LT18i using Tapatalk 2

  10. #55
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    Quote Originally Posted by HPE PETE View Post
    would i be mistaken that some guys may be putting the plug in the hole that the bypass counterbore/step is machined in to.....so not the bore where the bypass is pressed in to but the hole itself.....if you look at tk,s pump it kinda looks like its in the hole, could be wrong though

    this doesnt apply to zok by the way i know he pesses it in to the counterbore where the bypass seats

    the counterbore has a step at the bottom so the plug cant go through any further from the pressure side
    i wondered that too, was going to measure it up but didnt really want to put it in there. Just doesnt seem right.
    A minute of thinking can save hours of doing

  11. #56
    Do you ever leave? EH179's Avatar
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    When I did my pump a few years ago, I thought it odd that mine needed an 18mm plug, but Pete has just confirmed they exist

  12. #57
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    the hole isnt round as such but i guess a welch plug would distort to take up the out of roundness, the counterbore is where i would put it

  13. #58
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    Quote Originally Posted by EH179 View Post
    When I did my pump a few years ago, I thought it odd that mine needed an 18mm plug, but Pete has just confirmed they exist
    its a pain in the butt cause now i have to make another tool to remove the bypass without damaging it...DOH

  14. #59
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    While one of you guys have a pump apart can you get out the verniers and measure
    Gear width
    Gear tip diameter
    Gear centres when meshed

    Thanks!

  15. #60
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    I realize its a bit late. But do you still want that info Marzella. Ill have a jp standard vol one apart in the next day or so.

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