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 2 of 2
  1. #1

    Question 2003 Mercury 15 HP 4ST rebuild newbie questions

    Hi Guys,

    I recently purchased this 2003 Mercury 15ELH 4ST off craigslist non-running and intended on using it to learn how to work on, service, and possibly rebuild basic small engines. I purchased and am following the Seloc repair manual (1705) but still have a few questions.

    After repairing the recoil starter I did a compression test that resulted in ~85 PSI on the upper cylinder and ~60 PSI on the lower cylinder, so I decided to pull the powerhead off to take a peak. There is substantial salt in the head and there seemed to be a portion that clogged and lost it's flow and ate away at the head and I'm concerned. I also noticed a strange hole/window in the block, the shape of the hole looks intentional but the hole is rough making me think it's a problem. I've ordered a replacement powerhead gasket set after the low compression diagnosis but before noticing the damage.

    What do you think? Is this head & block salvageable?

    Questionable thin wall on cylinder head


    Cylinder head overall condition


    Questionable hole in cylinder block


    Thank you for any advice & guidance!

  2. #2

    Default Re: 2003 Mercury 15 HP 4ST rebuild newbie questions

    Well, after more digging and finding replacement powerheads on ebay that have the same wierd hole (3rd picture) I think i can safely rule that out as an issue, but i'm still questioning the integrity of the cylinder head.

    Any suggestions/questions/critiques/etc are welcome!

    Thanks!

Similar Threads

  1. Newbie questions about Alarm testing etc. 1988 135 Mercury 0B333118
    By Mr_T in forum Mercury Mariner Outboard Forum
    Replies: 2
    Last Post: 05-23-2015, 05:23 PM
  2. Mercury Blueband 50hp - Various questions from newbie!
    By ChrisBoom in forum Mercury Mariner Outboard Forum
    Replies: 5
    Last Post: 05-22-2012, 12:42 PM
  3. Mercury 70 3 cyl rebuild questions
    By colegobin in forum Mercury Mariner Outboard Archive
    Replies: 0
    Last Post: 02-07-2009, 08:08 PM
  4. 80bs mercury 288 50L 8cyl engine NEWBIE questions
    By im4524 in forum Mercruiser Sterndrive Archive
    Replies: 19
    Last Post: 11-10-2008, 01:54 PM
  5. 1972 Mercury 650 Rebuild Questions
    By johnm in forum Outboard motors archive 2000-2004
    Replies: 6
    Last Post: 08-20-2001, 10:06 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
  •