1979 Hawiian Bubble Build
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1979 Hawiian Bubble Build

  1. #1
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    Default 1979 Hawiian Bubble Build

    Hey guy i just bought my first jet boat a 1979 Hawiian Bubble. Im a just a young car guy and don't know much about these so i may have questions along the way. The boat most recently had a ford 460 in it.
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    I picked up the boat from a friend of a friend for 1000$ no motor and only parts of the interior, however it had all the excessories and parts i needed, including a brand new marine grind comp cam and lifters. Also has a very nice hand made cover that fits it perfectly made to fit around the headers.
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    I got the boat back to my shop and of course started tearing into it. I started by taking the jet pump a berkley 12jc off,
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    I then began to tear it apart so that i could reseal the whole thing, and freshen it up a bit i used nothing but top of the line stainless fasteners and followed the manual to the T
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    In the process of tearing it apart I destroyed the reverser
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    I then began to paint the pump to match the rest of the boat
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    After a couple days of delay (school and work got the best of me) I got back to working on her and was able to fix the reverserClick image for larger version. 

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    I also noticed that the screws holding my rear transom seal had washers on them and they were starting to damage the wood, so i build this plate to act as one big washer out of a sheet of stainless.
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    Now that my pump was painted and reinstalled i began searching online for an engine to build, and i was lucky enough to find a 1989 omc king cobra 460 fully dressed for 500$ spitting distance from my house. I picked the motor up and began to disassemble it
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    I was able to get my old man here for a day to help me disassemble the motor as he is much more knowledgable then me haha, the motor came out of a four winds and was advertised as stock, When we began to tear it apart it became evident that the motor was not a king cobra because it had no forged internals
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    I was however happily surprised to find out that the heads had been ported to gasket match and there was what appeared to be a crowler cam with aftermarket lifters and valve springs.
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    While i am waiting on my engine parts i ordered online the next step was to reinvent my motor mounts, The original ones appeared to be a home built style that were of very poor quality, something i know i don't want in my boat
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    While i was going to build new ones with the same design as the old my dad advised me to go a new route, so i decided to use the stock mounts out of the liberator. This is similar to something that would be in a old mopar engine, a shaft with a rubber bushing on either side of the motor mount
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    Thats where im at right now, i have two questions for you guys now, When dissasembling the engine we noticed that the lifters did not sit on the lobes of the cam evenly, there was probably only half the lifter on each lobe of the cam. There also seemed to be alot of thrust play. I want to know what you guys think of this? also is there some sort of adjustment on these big block fords? I also what to know what you guys think of my bearing cap? it was slightly broken on one of the edges so i took a file to it and cleaned it up, will this be satisfactory?
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    Any positive feedback is welcome and appreciated, also sorry if my format is good this is officially my first post on this forum
    Thanks guys there will be more to come as i continue working on the boat!!!!

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  3. #2
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    Default

    Look,s good. .

  4. #3
    Senior Member jetboatperformance's Avatar
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    Default

    Thats where im at right now, i have two questions for you guys now, When dissasembling the engine we noticed that the lifters did not sit on the lobes of the cam evenly, there was probably only half the lifter on each lobe of the cam. There also seemed to be alot of thrust play. I want to know what you guys think of this? also is there some sort of adjustment on these big block fords? I also what to know what you guys think of my bearing cap? it was slightly broken on one of the edges so i took a file to it and cleaned it up, will this be satisfactory?
    The lifters (flat tappet) do not set squarely on the cam lobes centers for lifter rotation function, off-center lobe-to-lifter contact is to to minimize lobe and lifter wear by rotating the lifter in its block lifter bore , suspect you already know but don't mix them up... regarding your Jet drive bearing cap the edges of the fore and aft lip help retain the bearing cap insulator necessary for your three point mount system , the rear mount housing clams around that cap comprising the rear mount support , to some degree the lip and clamping system helps control a bit of fore/aft movment, your cap has most of its lip and will likely be OK , You obviously have welding skills , maybe weld /repair the lip and then turn it back down , a new bearing cap is fairly inexpensive , used caps are plentiful . Nice attentive work, wish I could weld ... Welcome to PB Tom

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  6. #4
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    Default

    Quote Originally Posted by jetboatperformance View Post
    The lifters (flat tappet) do not set squarely on the cam lobes centers for lifter rotation function, off-center lobe-to-lifter contact is to to minimize lobe and lifter wear by rotating the lifter in its block lifter bore , suspect you already know but don't mix them up... regarding your Jet drive bearing cap the edges of the fore and aft lip help retain the bearing cap insulator necessary for your three point mount system , the rear mount housing clams around that cap comprising the rear mount support , to some degree the lip and clamping system helps control a bit of fore/aft movment, your cap has most of its lip and will likely be OK , You obviously have welding skills , maybe weld /repair the lip and then turn it back down , a new bearing cap is fairly inexpensive , used caps are plentiful . Nice attentive work, wish I could weld ... Welcome to PB Tom
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ID:	657793I was looking closer at the cam lobes tonight and they did seem to have relatively good wear on them, so I guess I have no need to worry about that. Im replacing the cam and lifters with a bigger one anyways. As far as the bearing cap goes I will just weld it up.... no need to cut any corners. Thanks for the reply!!! and u should try your hand at welding its a very useful skill/hobby to have.

  7. #5
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    Quote Originally Posted by Bobbylisa View Post
    Look,s good. .
    Thanks im gonna try to get more build pictures up along the way!!

  8. #6
    Senior Member spectralen's Avatar
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    Default Zinc !!!

    If you are using a flat tappet cam set up, make sure you use oil with zinc and or the additives they have for breaking it in.
    Valvoline Racing 20w50 has it.

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