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  1. #1

    Default Merc Cruiser 165 3.7 L

    First of let me start with Hello I'm new here. Name is Billand I hail from the Buffalo NY area.

    I am looking for help with my engine. I have an 88 Islander 22' with merc cruiser 165 3.7L
    When I am trolling at 1-2 mph, it loads up with carbon and wants to stall. If I put it in neutral, and rev up engine, a cloud of black dust like stuff comes out of the exhaust and floats on the surface of the water.
    After reving the engine several times, it seems to clear and runs fine.

    Is this something that is caused by the wrong spark plugs (to cold)
    or perhaps it has something to do with a carb. adjustment?

    I don't know the answer, that is why I am asking for help here.
    Thanks in advance for your help, Capt. Bill

  2. #2
    Join Date
    Dec 2006
    Location
    Greenfield Me. USA
    Posts
    6,073

    Default Re: Merc Cruiser 165 3.7 L

    Ayuh,..... Rebuild yer carb,.....
    Any Grease is Better,... Than No grease at All....

  3. #3

    Default Re: Merc Cruiser 165 3.7 L

    Thank You for your response.
    I ordered a rebuild kit for it.

  4. #4
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    12,087

    Default Re: Merc Cruiser 165 3.7 L

    While at low RPM, your engine is operating from the carburetor's low speed metering circuit.
    If this circuit is providing an excessively rich mixture, the engine will load up and want to stall out.

    Try adjusting the low speed metering to a more lean scenario.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  5. #5

    Default Re: Merc Cruiser 165 3.7 L

    Thank You for the replies.
    I ordered a rebuild kit for the carb and had a friend rebuild it. (Excellent Mechanic)
    Mounted carb on motor, waiting for a break to set timing and idle.

  6. #6

    Default Re: Merc Cruiser 165 3.7 L

    Update: I had my carb rebuilt, reset the timing, What a difference that made, I can troll at low speed all day and when it's time to head for home, I have all the speed I could want.

  7. #7
    Join Date
    Dec 2006
    Location
    Greenfield Me. USA
    Posts
    6,073

    Default Re: Merc Cruiser 165 3.7 L

    Cool,..... I Love a happy endin',......
    Any Grease is Better,... Than No grease at All....

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