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  1. #1
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    Merc 280 midsection/water pump question.

    I recently bought a 280 mid section with a single ram to use with my worked 175 2.5l engine. This mid section has a 3/4" water tube and my original lower unit/water pump has a water pump housing for a smaller diameter tube. What water pump housing do I need to get in order for this thing to work?? New to performance outboard engines.. thanks!
    Click image for larger version. 

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  2. #2
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    late model cle and sportmaster gearcases have 3/4" water pump housings

  3. #3
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    Would anyone happen to have the part number? I Also read you can modify the housing to a 3/4". anyone have any info on that?

  4. #4
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    Yes simple to cut off the 1/2" housing but you still need the sleeve and grommet for the 3/4" tube
    23-847685 sleeve
    26-88397 grommet
    Click image for larger version. 

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    The one on the left is a 1/2, right 3/4 and adapter (sleeve) for 3/4" tube
    And if you modify your housing, don't forget to take out the 1/2" grommet
    Oops, and drill out the housing to 3/4"




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