Logo
Get instant online access to repair manuals for your Mercury / Mariner outboard. Online Manuals
MercuryMariner
Order printed Mercury / Mariner service manuals — shipped to your door! Printed Manuals
MercuryMariner
Use engine diagrams to find & order parts for your Mercury / Mariner engine. Engine Diagrams
MercuryMariner
Find parts quickly with Mercury application guides. Quick Parts Guide
MercurySierraCDI
Results 1 to 6 of 6
  1. #1
    Join Date
    Dec 2020
    Location
    Southern California
    Posts
    19

    Default Mariner 9.9 hp 2 stroke cooling question

    I recently purchased a 1995 Mariner 9.9 HP 2 stroke.

    I noticed the water flow from the pee tube was not steady and didn't seem to be of sufficient volume.

    To fix this, I replaced the impeller, but the water flow still isn't a steady stream.

    Can someone with more experience give me some guidance as to what it could be, or what I need to check / replace to get the cooling system up to snuff?

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    17,017

    Default Re: Mariner 9.9 hp 2 stroke cooling question

    Those are tricky. You need to replace the impeller with the entire kit or they don't pump water correctly.

    Jeff

  3. #3

    Default Re: Mariner 9.9 hp 2 stroke cooling question

    Check to see if the water telltale is exiting from the thermostat housing. It will not be a steady stream until the thermostat opens fully which may be only at highspeed.

  4. #4
    Join Date
    May 2015
    Posts
    2,451

    Default Re: Mariner 9.9 hp 2 stroke cooling question

    Your pee hole exists directly from the thermostat. As stated needs to be warm for full flow.

  5. #5
    Join Date
    Sep 2010
    Posts
    21,163

    Default Re: Mariner 9.9 hp 2 stroke cooling question

    Also when using a test bucket the water level must 6 to 8" above the impeller.

  6. #6
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    4,064

    Default Re: Mariner 9.9 hp 2 stroke cooling question

    How did the original impeller look? Maybe the telltale is partially plugged. It might not be a part from the impeller but it could be plugged with weed or any other contaminants that the motor picked up along the way. Saltwater motor?

Similar Threads

  1. Mariner 9.9 hp 2 stroke question
    By sailscubasurf in forum Mercury Mariner Outboard Forum
    Replies: 2
    Last Post: 01-09-2021, 11:59 AM
  2. OMC Zephyr 15HP 2 stroke cooling question
    By 27floater in forum OMC Sterndrive and Inboard Forum
    Replies: 4
    Last Post: 04-14-2014, 03:02 PM
  3. 1986 175 Mariner cooling question
    By 99LSxSS in forum Mercury Mariner Outboard Forum
    Replies: 2
    Last Post: 06-16-2012, 08:41 PM
  4. Mariner 1996 9.9 4-Stroke Cooling Question
    By rja1013 in forum Mercury Mariner Outboard Forum
    Replies: 0
    Last Post: 03-19-2011, 08:38 PM
  5. Mariner Model 675 60 hsp cooling question
    By boyd in forum Mercury Mariner Outboard Archive
    Replies: 1
    Last Post: 06-11-2007, 09:58 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •