[Question] Jacuzzi yj rebuild
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Jacuzzi yj rebuild

  1. #1
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    Default Jacuzzi yj rebuild

    Hello fellow jet boaters. A few weeks ago I had a catastrophic loss on the lake and am now in the process of rebuilding my jacuzzi yj drive. The boat is a 1973 Caravelle Barracuda IV, tri hull with a 455 olds. The boat is fairly heavy, with trailer around 3200 lbs. The drive is factory stock from 1973. After a lot of work I was finally able to remove the motor and entire drive and tear down most of the drive. Man they used some awesome glue in 73. Judging from what I can see so far and from the research I've done I think I have a couple options. My small budget is the constraint.
    So far I've determined the front bearing exploded, taking the bearing housing out as well. So if I rebuild this drive back to stock I know I need a rebuild kit, which I see JBP has for about $250, and probably try to find a used front bearing housing. My bigger question is on the impeller and wear ring. The impeller is stainless and worked well before the loss, but I now see it has some Knicks. The impeller was not past the wear ring and from what I could tell had tolerable clearance. Difficult to tell with the bearing blown apart. Can I grind the edges of the impeller to smooth out the Knicks or will I have to have it balanced? Can I reuse the wear ring?
    Option 2 would be to put an energizer kit in. I can't afford a new one, so if I could find a reasonably priced used one that may be a better option.
    Also what glue do you guys use to put the drive back in?
    Just a family ski boat on Iowa lakes.
    thanks
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    Last edited by Duecswild67; 09-12-2013 at 06:24 AM.

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  3. #2
    AKA OhOneWS6 Last Mohican's Avatar
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    You should contact Tom at Jet Boat Performance. He may have the bearing cap you need. Most people use Sea Goin Poxy Putty to reset the intake. Hind sight it 20/20 but you more than likely could have left the intake set in the boat. Since it is out now you need to be sure and set it back in the correct position. Tom will be a good resource for instructions on that as well.

    As for the impeller, It will depend on how worn it is. You need to make sure it is not so worn that it will protrude past the wear ring once the clearance is set. Here is an example of a Jacuzzi impeller that is too far gone. If you set the wear ring on the impeller you do not want it to come past the edge of the wear ring. See the red lines.




    If you need a new impeller and wear ring the cost go up significantly. At that point you may as well get the conversion kit. There are a couple of choices out there for conversions. Finding a good used conversion is kind of like looking for hen's teeth. Even if you find one it very well may be worn out.

    Matt

  4. #3
    AKA OhOneWS6 Last Mohican's Avatar
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    Another option is to replace the YJ with a Berkeley style pump. since you already pulled the intake you are well on your way for that conversion.

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  6. #4
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    I had to take the intake out because I could not get to the 2 bolts in the back, so I took it out as a whole unit. I thought about a berk conversion but from what I understand Berks are small and the hole in my boat is to big. I'm pretty sure the impeller and ring are good a far a clearance as the impeller was def not past the ring.

  7. #5
    Senior Member jetboatperformance's Avatar
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    You should be able to carefully clean up the impeller blades evenly with a file or die grinder , your impeller (pic 5 ) does not look like the forward blade tips have exceeded the forward tapered edge of the wear ring (like Matts example) so with proper shimming to correct clearance you will likely be able to re use that blade and wear plate combo, Probably a good idea to replace the mechanical seal (spring loaded device) which is likely damaged . Obviously its time to replace the Thrust bearing and related clipper seals as will . The YJ Bearing caps are out of current production and your best bet is to try to find a used one or the perhaps one new billet caps offered by some. The YJ axial flow is a good workhorse jet used in larger heavier boats like yours and smaller HP applications and although not considered a performance jet pump it along with its 14YJ brother has enjoyed past success since the late 60's in the pleasure boat industry not to mention small craft military applications Tom

  8. #6
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    Tom, your rebuild kit for a yj that is $279 should be pretty much be all I need right? Do you have any used bearing caps for a yj and how much?
    Thanks

  9. #7
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    I have a used bearing cap in good working condition. $20 plus shipping

  10. #8
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    Finally got the drive completely torn down. WOW! That was quite a job. Think I'll be good with a rebuild kit from performance jet boat and a thrust bearing cap. Rushin.... I'll buy that cap if you still have it. Ordering parts this week. I'll post some more once going back together.

  11. #9
    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by Duecswild67 View Post
    Finally got the drive completely torn down. WOW! That was quite a job. Think I'll be good with a rebuild kit from performance jet boat and a thrust bearing cap. Rushin.... I'll buy that cap if you still have it. Ordering parts this week. I'll post some more once going back together.
    It goes back together much easier than it comes apart. Worst part is getting that impeller off.

  12. #10
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    Default Resetting yj loader

    Ok so I got the drive back together. Thanks tom at JBP for all the help and supplying the parts. Now I'm putting the drive back in the boat starting with the intake. I spoke to Tom for a few minutes today about reinstalling the intake and he thought it was supposed to sit at a 4 degree angle. I'm assuming that means the front pitched down.
    The boat had a round keel, but I was able to level to boat front to back and side to side. I put 4 new leveling bolts in the intake and sat it in the hole. I'm pretty sure before I took this out the 4 corners of the intake were even with the keel. I'm not sure if from the factory they angled the intake or just made it fit the rounded hole. Any input would be great. I also noticed my rock grate is cracked. I can have it welded pretty cheap but wondering if it would make sense to put the sport edition loader in. Would it help the performance? Here's a few new Picts.
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    Last edited by Duecswild67; 10-11-2013 at 06:24 AM.

  13. #11
    Senior Member jetboatperformance's Avatar
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    Still looking for a Jacuzzi pic but found this for the time being your intake will be in at 7* however


  14. #12
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    That means 7 degrees with the rear pitched down, thus moving the jet further down into the water.
    Last edited by Duecswild67; 10-10-2013 at 06:55 AM.

  15. #13
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    replace the rock great, aftermarkets for the yj dont really improve it unless a conversion has been done

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