Thrust bearing failure
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Thrust bearing failure

  1. #1
    Senior Member Hass828's Avatar
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    Default Thrust bearing failure

    What do you guys think caused this? I went out yesterday for the first time this yr and drove it pretty hard doing some tuning, then stopped and hit the nos hard for about 6-7 seconds and run up to 125mph and everthing seemed fine till I got back to the ramp and could smell the leaking jetaway fluid.
    I disassembled and found that a piece had broke off of the race and poked a small hole in the back seal.

    Just a weak Bearing?

    It was a ZKL 3307. And had very little run time.

    Last edited by Hass828; 04-21-2010 at 03:13 PM.
    "if we keep doing it the same way we always do..we will always get the same results"
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  3. #2
    Senior Member Hass828's Avatar
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    after looking a little closer I think I see why it failed. For some reason i got talked into running one of these new aluminum spacers behind the bearing instead of the older stainless design. Look at the difference. the stainless is larger OD and requires a larger seal and supports the race better.


    look at the pic of the smaller aluminum one setting on the bearing, its just asking to break the race off (like I did).

    Here's the stainless one setting in the same position. I dont think it would have allowed the race to fail.


    so, moral of the story, you guys with some good hp make sure and dont use the aluminum -smaller spacer.
    "if we keep doing it the same way we always do..we will always get the same results"
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  4. #3
    Senior Member Widetrack's Avatar
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    Hass What kind of RPM are you turning?


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Im betting the race was dropped or had an imperfection when the bearing was made.

  7. #5
    Senior Member Hass828's Avatar
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    Quote Originally Posted by widetrack View Post
    hass what kind of rpm are you turning?
    6800
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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  8. #6
    Senior Member Widetrack's Avatar
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    Was this side facing the Jet A Way?

    Duh! I know better! bad Question!
    Last edited by Widetrack; 04-21-2010 at 03:04 PM.


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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  9. #7
    Senior Member Hass828's Avatar
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    Quote Originally Posted by cjaj70 View Post
    Im betting the race was dropped or had an imperfection when the bearing was made.
    If you look at the pic of that bearing , it broke right down to the exact place were the aluminum spacer was touching. That spacer has the edges very rounded off and didnt have hardly any surface area actually touching the race. The stainless one is almost squared off and is larger diameter too. Supports almost out to the edge of that race.
    Last edited by Hass828; 04-21-2010 at 03:11 PM.
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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  10. #8
    Senior Member Hass828's Avatar
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    Quote Originally Posted by Widetrack View Post
    Was this side facing the Jet A Way?
    No, this side was facing the impellar.
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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  11. #9
    Senior Member Widetrack's Avatar
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    I would think you have the problem solved! It is possible a defect too! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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  12. #10
    DJG
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    The thicker wall slinger ring is for an early dominator 12-s. The thinner one is for a late dom, berk, legend. I wouldnt think that was your problem because I have seen 1800 plus hp make many passes with the thin wall slinger. That is with a koyo 3307 though not a zkl.
    Last edited by DJG; 04-21-2010 at 03:45 PM.

  13. #11
    Boat Nut sleekcrafter's Avatar
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    X 2 on the Koyo 3307, have a ZLK in the shop with about 3 weeks of use, it's bad enough already I would not put it back in. good thing the rachet lube stinks
    Upper Midwest Power Boat Association
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  14. #12
    Senior Member Hass828's Avatar
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    Quote Originally Posted by DJG View Post
    The thicker wall slinger ring is for an early dominator 12-s. The thinner one is for a late dom, berk, legend. I wouldnt think that was your problem because I have seen 1800 plus hp make many passes with the thin wall slinger. That is with a koyo 3307 though not a zkl.
    Either one of the slingers will fit mine and its a new dominator suction. You just have to have the correct seal for the slinger.
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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  15. #13
    Senior Member Hass828's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    X 2 on the Koyo 3307, have a ZLK in the shop with about 3 weeks of use, it's bad enough already I would not put it back in. good thing the rachet lube stinks
    I'm going to try the Koyo this time. and your right about the lube stinking
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
    [email protected] first pass

  16. #14
    B1 Racing cs19's Avatar
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    Low quality bearing caused that in my opinion.

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