Wiped out the impeller
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Wiped out the impeller

  1. #1
    Senior Member lbhsbz's Avatar
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    Default Wiped out the impeller

    Had a great time at Big River on Saturday, then made a couple passes before pulling it out of the water and the temp guage spike to 200°...After making sure all the lines were clear/valves open I pulled the bowl and found this.





    It beat up the aluminum in the pump body about 1/4 behind the wear ring too.

    What are my options here....and how'd it happen? I'm making a bit over 600hp, so I know I'm going to a stainless impeller. Is the pump casting salvageable or will I be looking for one of those too.?

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    Senior Member OkieDave's Avatar
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    Default thrust bearing?

    better look at your thrust bearing. also may need to check the motor, if the pump shaft pushed on the crankshaft too much, you may have hurt the motor too.

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    Senior Member gregb's Avatar
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    I think your thrust bearing went south, that's about the only way the impeller is going to move forward like that. I don't know if your bowl is salvageable, I'd run it over to Jack at MPD (he's in Costa Mesa). And as Okiedave said, check the engine. I'd at the very least cut the oil filter open and look for signs of a main bearing getting chewed up.

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    That sucks.... looks just like mine did. IMO find you a good suction housing and start over.The thrust bearing prob. went south, thats what caused mine.New bearing seals wear ring, impeller,bowl bushing and check the shaft and your on your way. just my .02 cts Good luck

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    all good advice above, but check out the suction housing real good , i have had good success in repairing these with aluminum putty to restore them back to usable condition at a fraction of the cost of a housing , unless you can pk one up on the cheap and ckeck it out to be sure it is in great shape. had one of the housings back in for rebuild recently that i did in 1989 . the putty still looked as new, hard to tell that it had been damaged. good luck.

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    Senior Member lbhsbz's Avatar
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    Well...got the pump out. The front bearing is about non-existant. There is about 1 inch of shaft endplay. I checked it before the trip when I had the impeller out and there was no endplay. OH well. I haven't checked crank endplay on the engine yet, but I expect the worst. I'm gonna yank the motor this afternoon and flip it over. Shit. Less than 1 hour on the boat and already it's costing me more $$$. I was hoping to get at least 2 hours out of it LOL.

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    Senior Member lbhsbz's Avatar
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    WOOHOO...crank endplay is exactly where I set it when I built the motor. When I noticed the problem, I shut it down, so I don't think it ran for more than about 20 seconds after the bearing broke....I'll change the oil a couple times, check endplay again, and call it good.

    Now to look for a pump.

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    That suks but at least the engine isn't hurt.

    What causes a thrust bearing to go out to begin with?

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by lbhsbz View Post
    I was hoping to get at least 2 hours out of it LOL.
    thats a damn good attitude.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    Quote Originally Posted by hotrod56cars View Post
    That suks but at least the engine isn't hurt.

    What causes a thrust bearing to go out to begin with?

    Water, lack of lube,wrong lube,shaft runout or like any thing else just fail???? One hell of alot of load on them IMO

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    Quote Originally Posted by gregb View Post
    I think your thrust bearing went south, that's about the only way the impeller is going to move forward like that. I don't know if your bowl is salvageable, I'd run it over to Jack at MPD (he's in Costa Mesa). And as Okiedave said, check the engine. I'd at the very least cut the oil filter open and look for signs of a main bearing getting chewed up.
    glad your end play is the same but my .02 is i could not sleep without checking the rods and main to be sure. little time invested heck of a lot of money possibly saved.

  14. #12
    Senior Member lbhsbz's Avatar
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    got the pump all torn down...

    Final Casualty report:

    Impeller dead
    Shaft dead (twisted splines)
    Housing dead (spun the bearing race...well, half of it spun...yeah, I broke that too)
    I didn't think it was possible to split a ball bearing in half, but I have several examples disproving my original thoughts.

    Hey, at least I was able to salvage the impeller nut!

    Fawk.

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    Quote Originally Posted by lbhsbz View Post
    got the pump all torn down...

    Final Casualty report:

    Impeller dead
    Shaft dead (twisted splines)
    Housing dead (spun the bearing race...well, half of it spun...yeah, I broke that too)
    I didn't think it was possible to split a ball bearing in half, but I have several examples disproving my original thoughts.

    Hey, at least I was able to salvage the impeller nut!

    Fawk.
    Sorry to hear your already having issues, I saw you running last weekend and it sounded good

    Mark

  16. #14
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by wrightnow View Post
    Sorry to hear your already having issues, I saw you running last weekend and it sounded good

    Mark
    Thanks,

    what boat were you in? I would have been more social, but I was having too much fun running my boat around...till it broke. Then I had fun drinking beer.

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