Reply To: Winter Project 1957 Johnson Javelin

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September 25, 2025 at 11:50 am #300146
David Stanton
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    You wrote:  Another question, the Red Book mentions an upgraded water pump housing for the big twins with a stainless baffle added but doesn’t list a part number and marine engine doesn’t show a superseded version but does mention two impellor sizes.  I have the original water pump version so wonder if anyone has had trouble running that old style pump?

    My Sierra catalog shows a new impeller beginning in 1958.  Your golden javelin is a 1957.

    1951-1957 is Sierra 18-3006, OMC 378891, superceded by 775521

    1958 -1970 is 18-3083 OMC 377230, superceded by 777213

    Dave