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  1. #1
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    Opinions on older style trim pump for 2.5 merc...pic included

    Got this pump along with a blown motor I bought for parts... wondering if it's worth keeping or should I get rid of it...everything works great, has new solenoids, new trim lines...no leaks etc...would be using it on a 2.5L carbed merc. Thanks.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 245 hp merc

  2. #2
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  3. #3
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    What he said.
    those old pumps don't die.....or at least the 2 I've had wouldn't.
    they aren't fast but they last.

  4. Likes Magcat 62 liked this post
  5. #4
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    Quote Originally Posted by XstreamVking View Post
    run it till it blows.....
    Quote Originally Posted by Tomanytoys View Post
    they aren't fast but they last.
    1981 Hydrostream Varmint - 1979 Mariner 175

  6. #5
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    I've used 'em for years! They can be run on 24v to speed'em up and work extremely well if you change the Pump to a Mercruiser pump.
    Motor, bracket, can, etc. will all interchange but you jst need the pump itself!
    Mercruiser Pump + 24v = Rock'n Roll!!!
    WillySteve Hendricks



    20XDC Bullet/Modified Merc 260
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    18" Home Made Tunnel/OS .021XM Outboard on 50% Nitro and Expansion Chamber

  7. #6
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    Great! Thanks for the input! I'll run it with my set up for now!
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 245 hp merc

  8. #7
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    Quote Originally Posted by WillySteve View Post
    I've used 'em for years! They can be run on 24v to speed'em up and work extremely well if you change the Pump to a Mercruiser pump.
    Motor, bracket, can, etc. will all interchange but you jst need the pump itself!
    Mercruiser Pump + 24v = Rock'n Roll!!!
    Yep, but 24v to the stocker works too! Also flush out the old motor oil and run atf or tractor hydraulic fluid...
    1981 Hydrostream Varmint - 1979 Mariner 175

  9. #8
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  10. #9
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    Quote Originally Posted by nitro_rat View Post
    Yep, but 24v to the stocker works too! Also flush out the old motor oil and run atf or tractor hydraulic fluid...
    I like aviation hydraulic oil aeroshell 44 is what I use

  11. #10
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    Motorcycle fork oil. Easy to find and you can get lighter weight than atf. Mike
    Cheaters never Win !!!

  12. #11
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    Lighter the oil, quicker the Trim, less resistance?
    15.5 cobra 175 hp merc - sold
    18 tahiti tiger O/B 200 hp merc - sold
    19 STV euro - 245 hp merc

  13. #12
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    That's it!
    1981 Hydrostream Varmint - 1979 Mariner 175

  14. #13
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    Yep like nitro said. Very noticeable difference compared to 30weight. Mike.
    Cheaters never Win !!!

  15. #14
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    Not just oil weight but check viscosity indexes at varying temps too.

    One of the good things about aviation hydro fluid is it is designed not to have as much variation in viscosity index with temp changes as traditional "tractor" hydro fluid.

    Less variation means more consistent trim timing

  16. Likes nitro_rat liked this post
  17. #15
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    Good point !
    Cheaters never Win !!!

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