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  1. #1
    Member RING21E's Avatar
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    mercury 300X bleed lines question

    I've a question regarding the bleed lines on the 300X engines, 0T235084 - 0T429939 (USA) & 0T429940 - 0T999587 (USA)
    Why on the port side of the block there is absolutely no bleed line on the block and 3 bleed lines on the starboard side block ??
    Are they necessary on the port side? because doesn't exist on the opposite side.





  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2
    Due to the configuration of the intake/reed plate, the odd cylinders do not tend to puddle as much as the EVEN cylinders do.

    Consequently 1-3-5 are fed to #6 (and the VST) while 2-4-6 and fed predominately among themselves (there are some cross ups that run across below the intake if you follow the diaphragms).

    Similar to other engines- just accomplished in a simple method (with less emphasis on bleed system as the engine wasn't expected to do a lot of low-RPM operation, anyway).


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. Member RING21E's Avatar
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    #3
    Quote Originally Posted by EuropeanAM View Post
    Due to the configuration of the intake/reed plate, the odd cylinders do not tend to puddle as much as the EVEN cylinders do.

    Consequently 1-3-5 are fed to #6 (and the VST) while 2-4-6 and fed predominately among themselves (there are some cross ups that run across below the intake if you follow the diaphragms).

    Similar to other engines- just accomplished in a simple method (with less emphasis on bleed system as the engine wasn't expected to do a lot of low-RPM operation, anyway).
    Many thanks again for all these technical informations DON!!!
    Just wondering if on a 2 stokes outboard (not especially this model) with horizontal reeds block it's possible to avoid bleed line as you mentioned on the Odd cylinders they don't tend to puddle as much as even cylinders do. Or if the techniques did not find out other solution to solve the use of external bleeds lines?

  4. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #4
    Most standard production models utilized SOME bleed system (even the Optimax models did). It serves a specific purpose, namely to "remove puddled, unburnt fuel or oil, and move it to another area of the engine where it can be used for lubrication or burnt".


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  5. Member RING21E's Avatar
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    #5
    Quote Originally Posted by EuropeanAM View Post
    Most standard production models utilized SOME bleed system (even the Optimax models did). It serves a specific purpose, namely to "remove puddled, unburnt fuel or oil, and move it to another area of the engine where it can be used for lubrication or burnt".
    thanks for explanations