Engine Hatch build. 85 Kachina
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Engine Hatch build. 85 Kachina

  1. #1
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    Default Engine Hatch build. 85 Kachina

    So, I searched everywhere for something, anything on building an engine hatch on an old jet boat but only found like 2 things. There is really not that much info on size, shape, design, material or weight. I figured I would post some stuff about how I ended up doing it. I do not know if it's right way or even if there is a "right" way, but at least it'll give someone some ideas if needed. I wanted people to be able to walk across it so I went with mostly 2x4 framing with the exception of the starboard and port outside most framing, which i used 3/4 in plywood. The intake and carb stick up quite far from the compartment so I designed a cowl induction type scoop that is actually a second piece. After framing, I wrapped the hatch with polar fleece and applied poly resin to get the shape of the hatch. I stapled the fleece where there was frame to staple to, to ensure a good bond. After that I applied 2 layers of 2 oz chop mat and then finalized it with 1708 bi-axial. I haven't finished it yet and I will update if anyone is interested in the finished product. I know I'm leaving some steps out, so feel free to ask any questions.
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  3. #2
    Senior Member nikwho's Avatar
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    Cool project! I'm looking at a '70 Kachina that I was thinking about picking up and doing something very similar with. I was considering using 3/4" on edge, that I could cut out the contour of a similar air cowl. Also, I figured that two pieces of 3/4" plywood would be easy to bend to form a slight radius to match the lines of the hull. I wanted the same ability to walk on the cover. This little boat that I'm looking at has a small block, so I was hopeful that I might even be able to get away with a flat surface that could be used to lay on, etc. I would love to see progress and final product pictures!

    Nik

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    Default protect it!

    Make sure to either primer the crap out of the bare underside or resin it before covering. If not, the bare wood will surely start sucking in moisture and all that great hard work will be in vain.

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    Quote Originally Posted by andyc View Post
    Make sure to either primer the crap out of the bare underside or resin it before covering. If not, the bare wood will surely start sucking in moisture and all that great hard work will be in vain.
    I layed 2 coats of resin to "waterproof" all exposed wood

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    Nice to see a thread like this, thank you. Is the hatch resting on pins up front? Would like to see how it closes on the front end. I'd also enjoy seeing a close up of one of the rear hinges. And definitely want to see the finished product!

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    The front of the hatch is resting on the base for the rear bench seat. I drew an arrow indicating the base. The new rear bench seat back will be level with the engine hatch to keep it looking uniform. I am not sure how I'm going to have it fasten shut. I like how the hood latches down on my Jeep Wrangler so I might just purchase one of those and use that, I'm not sure. Any ideas would be welcome!! The hinges I'm using are long reach stainless and were pretty cheap. I hope they functional well once installed. I posted a pic of those too, the brand is Seadog I believe. I am taking the boat down to the upholsterer next Monday so I'll post pics of the finished product once they are done with it.


    Quote Originally Posted by 1320 View Post
    Nice to see a thread like this, thank you. Is the hatch resting on pins up front? Would like to see how it closes on the front end. I'd also enjoy seeing a close up of one of the rear hinges. And definitely want to see the finished product!
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    Thanks for the additional info, like the hinges. Looking forward to seeing the finish.

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    Default Update

    Rear bench seat and cowl completed. Still waiting on the hatch.
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  11. #9
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    Quote Originally Posted by PDUBB13 View Post
    Rear bench seat and cowl completed. Still waiting on the hatch.
    Looks nice!!

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    Didn't come out quite like I had imagined but, close enough I guess. There's about a 1/2" gap between the back 2 corners of the hatch and boat but whatever. What's done is done.
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    Looks pretty damn good to me! Many thanks for the follow up.

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    Just a little update. installed the cup holders and hatch lifts aka gas struts. 2 gas struts from McMaster-Carr, both 50 lbs extension force. This place has a ton of stuff and really great pricing. these struts were only like 24.00ea and 10mm ball stud mounts in all sorts of configurations. corrosion resistant stuff too.


    4138T61 Gas Spring 27.87" Extended Length, 50 lbs. Extension Force
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  15. #13
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    Quote Originally Posted by PDUBB13 View Post
    Just a little update. installed the cup holders and hatch lifts aka gas struts. 2 gas struts from McMaster-Carr, both 50 lbs extension force. This place has a ton of stuff and really great pricing. these struts were only like 24.00ea and 10mm ball stud mounts in all sorts of configurations. corrosion resistant stuff too.


    4138T61 Gas Spring 27.87" Extended Length, 50 lbs. Extension Force
    That's awesome! Does it open and shut smoothly? I'd like to do something like that to my boat when I get to the building the engine cover. What a great solution!

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    Quote Originally Posted by az_mike View Post
    That's awesome! Does it open and shut smoothly? I'd like to do something like that to my boat when I get to the building the engine cover. What a great solution!
    smooth as butter my friend

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