1980 100hp powerhead swap

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Pirate56

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Feb 22, 2004
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Will a 1975 115hp powerhead fit onto a 1980 Javelin 100hp? The 1980 has t/t short & shaft. Any other issues? Appreciate your help.
 
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phatmanmike

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Re: 1980 100hp powerhead swap

i heard that the 1975 has a different bolt pattern.<br /><br />but what do i know
 
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Dhadley

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Re: 1980 100hp powerhead swap

Even if you change the bolt pattern you'll have a water leak between the powerhead and adaptor plate. The water will come pouring out at the front by the upper motor mount.<br /><br />You can adapt a newer model (78 & up) to an earlier one with no problem.<br /><br />Trust me on this one.
 
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Dhadley

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Feb 4, 2001
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16,978
Re: 1980 100hp powerhead swap

BTW -- they never made a short shaft (15") V4 crossflow in the recreational line. You have, most likely, a long (20") shaft. They did make a x-long (25") but they are fairly rare.
 
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Pirate56

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Re: 1980 100hp powerhead swap

Originally posted by Dhadley:<br /> Even if you change the bolt pattern you'll have a water leak between the powerhead and adaptor plate. The water will come pouring out at the front by the upper motor mount.<br /><br />You can adapt a newer model (78 & up) to an earlier one with no problem.<br /><br />Trust me on this one.
Click to expand...
 
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Pirate56

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Feb 22, 2004
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Re: 1980 100hp powerhead swap

Thanks for the info will the t&t adapt to the 75? And do you know if the lower units interchangable? thanks
 
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Pirate56

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Feb 22, 2004
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Re: 1980 100hp powerhead swap

Thanks again everybody still wondering if i can bolt T&T and possably lower unit to the '75 115593E115 '80 100 J100trlcsc
 
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Marc J.

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Mar 16, 2004
Messages
267
Re: 1980 100hp powerhead swap

I'm sure Dhadley could make it work. He could make a Merc L.U. work also. (He's a mechanical genius.) A powerhead (88, 90 or 115 hp) from the 1980's should be a direct bolt-on, also easier to find parts for. V4 lower units from 1978 to 1995 are interchangeable, prior to that it gets kinda weird.
 
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