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Your Friendly Merc
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4 Posts
Discussion Starter #1
Hey fellas, I'm a newb around here so I'll try not to sound like too much of an idiot. I have a 1979 Youngblood TX-19 with a Berkeley 12-JR pump in it. I bought the boat two years ago and it is in absolutely mint condition. Supposedly it was raced from the time it was new in 79' until 81' when the guy who I bought it from purchased it. Anyway, when I bought the boat it had a fairly mild roller cam 468 bbc in it with a full interior and it ran 78-81 on the gps with just me in it all day long. Well, being like the rest of you guys probably are, I couldn't leave well enough alone so I decided to buy a bigger boat with an I/O for family outings and make the Youngblood a HotRod!

I stripped everything out of it including all of the interior and carpet and went back with two carbon fiber bucket seats with snap on covers and fresh gel-coat on the floor. Then I decided to have a new engine built and wound up with an aluminum headed 10.5:1 pump gas tunnel ram 540bbc. The engine is nothing radical, it makes 720hp and 695lb ft of torque.

Okay, here's where the fun starts. After putting the new engine in this spring we went out and ran it around a little and everything was fine. Then when I finally decided to get after it a little, the pump started cavitating pretty badly and there was no way I could keep my foot in it, not even once the boat was on plane and running 30 plus mph or so. If I was running along at 3000 rpm and stomped on it the engine would just go to the moon.

So we took it out of the water and pulled the bowl off to see if there was something in the pump, and that is when I saw something that was new to me, a NON metallic wear ring! I have owned jet boats for 12 years and I have rebuilt three different pumps, but never have I seen anything like this. It appears to be made out of some kind of plastic or something, and the one in my pump appears to be chewed up quite a bit.


I went ahead and pulled the pump because I think the smart thing to do would be to go ahead and rebuild it at this point with the new engine and all. What I would like to know though is, what is the deal with this wear ring that I have, what was it's intended use, and should I be going back with a stronger brass/strainless wear ring in my higher horse power application, or will I have to use a similar wear ring to what I have now because the pump was set up to use it?

Also, because of the increase in power, and hopeful huge increase in speed, I am thinking of having the pump professionally done so that it can be properly checked out and set up specifically for this boat/engine combo. If anybody can recommend a good pump guy who knows his stuff that I can send this thing to, I would appreciate the info.

I think I need a different cut impeller as well as some other hardware changes and I will be needing some help with that also.

I apologize for the lengthy first post and newbie questions, as well as all of the probably unecessary information, but I am about to pull my hair out stressing over this deal. Thanks.
 

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mo balls than $cents$
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11,734 Posts
you ran the motor on the trailer with the pump hooked up didn't you. tisk tisk tisk :)hand:D that wearring is a ultimate wearring and was a nice piece, but they won't live thru a dry start. the pump HAS TO BE IN THE WATER OR DISCONNECTED ;)
 

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mo balls than $cents$
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11,734 Posts
btw, welcome to the site! where are you in okla.? i've also got a gullwing, my tx-19 is a ervin capps condor:)devil
 

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Your Friendly Merc
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4 Posts
Discussion Starter #4
Thanks for the welcome, and NO, I DID NOT run the boat on the trailer. As I said in the thread, I have owned jet boats for 12 years, and I have learned NOT to run them out of the water. I can assure you that this boat has never been run out of the water since I have owned it.

Now, with that being said, the previous owner may have run it out of the water, but I doubt it. If this wear ring is as fragile as you say it is, and he ran it out of the water, I would think that the boat would have had issues when I first got it even with the milder engine.

I spend most of my time living at Lake Nocona which is very near the TX/OK border during the summer if I am not on a job somewhere, but I also have a place in Bethany, Oklahoma.
 

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Angry American
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3,103 Posts
I am thinking of having the pump professionally done so that it can be properly checked out and set up specifically for this boat/engine combo. If anybody can recommend a good pump guy who knows his stuff that I can send this thing to, I would appreciate the info.
Being that it's in OK/TX, has the Ultimate wear ring and the boat was raced, I'd be willing to bet that Duane at Hi-Tech Performance already had something to do with your pump. He's here on the boards or you can find his contact info on his website-
http://www.hi-techperformance.com/
 

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Registered
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589 Posts
Contact Duane at Hi tech performance, that wear ring will hold high hp just won't last long if run dry or if it ate alot of sand at some point. He can also help with the pump blue print. Jet boat performance or MPD can also do wonders with jet pumps. Just depends on where you are located and how much of a hurry your in, this is the busy season.
 

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mo balls than $cents$
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11,734 Posts
Thanks for the welcome, and NO, I DID NOT run the boat on the trailer. As I said in the thread, I have owned jet boats for 12 years, and I have learned NOT to run them out of the water. I can assure you that this boat has never been run out of the water since I have owned it.

Now, with that being said, the previous owner may have run it out of the water, but I doubt it. If this wear ring is as fragile as you say it is, and he ran it out of the water, I would think that the boat would have had issues when I first got it even with the milder engine.

I spend most of my time living at Lake Nocona which is very near the TX/OK border during the summer if I am not on a job somewhere, but I also have a place in Bethany, Oklahoma.
:D cool, nutha okie :)devil i live on the stateline with texas also, near paris tx, lil town called hugo.

as suggested, get with duane for another ring. chances are you were barely loading the pump efficiently before the rebuild and now that you have more power, you're needing more intake pressure or to load the pump harder. if it doesn't have a inducer, do it now, i doin 1 soon myself.
 

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Your Friendly Merc
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4 Posts
Discussion Starter #8
Thanks for the replies fellas. I will contact Duane. If I can't find someone who can blueprint the pump pretty quick, I may just go through it myself so that I can get back on the water. The summer is about the only time I have to play at all.

I am still a little unsure about this style of wear ring. Where I boat the water is very sandy. For instance, whenever I change the water pump impeller in my I/O boat there is always sand residue in the little housing. That being the case, it may have been the sand that did the wear ring in to begin with.
 

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mo balls than $cents$
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11,734 Posts
Thanks for the replies fellas. I will contact Duane. If I can't find someone who can blueprint the pump pretty quick, I may just go through it myself so that I can get back on the water. The summer is about the only time I have to play at all.

I am still a little unsure about this style of wear ring. Where I boat the water is very sandy. For instance, whenever I change the water pump impeller in my I/O boat there is always sand residue in the little housing. That being the case, it may have been the sand that did the wear ring in to begin with.
sure, i can understand that. the u.w.r. will heal itself from slight damage to a point. call duane;)
 

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mo balls than $cents$
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11,734 Posts
Okay, a call to Duane it will be.. I am thinking about checking into to one of his jet-a-ways as well, it's only money, right?? LOL
yeah, i try telling that to my wife but i keep gettin the "horseshit" reply :D:D i've got her making off nitrous passes now in mine, soon she'll be down with the sickness and help fund it :p:)hand
:D
 

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Registered
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1,379 Posts
Just read this thread. We are located in Shell Knob, MO. We can do a one day turn-around on your pump, or we can sell you the parts and help you do it youself. Just give us a call. 417-858-8616.
 

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E-7 Sheepdog (ret)
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6,834 Posts
I'm one of the UWR users. Been running them since 1989. Since then, have only run 2 of them. The one from 89 was still fine when the Al. impeller was replaced by Bronze 3 winters ago, so full rebuild happened, including UWR.

I've run that wear ring from 280HP (fully stock '78 indmar 454), thru 650 HP (current build of the same 454, now modded and snorting more nitrous)
It works very well if not abused, and for a VERY long time. My first was still sealing well after 16 years..

I'd bet the previous owner screwed it up for you then, and it wasn't very obvious with the old powerplant. Serious HP making serious bowl pressure, is now blowing a LOT of water past the UWR and disrupting intake flow, cavitating the impeller.

By the way, it isn't plastic, it's Urethane rubber (think of objects like bowling balls, skateboard/skate wheels, police Nightsticks, Streamlight flashlights, etc.).

Welcome, and best of luck to you.
 
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