Merc identification

  • watisituya
    North Metro
    Posts: 238
    April 6, 2017 at 10:57 pm #1686996

    Can anybody tell me what year and cylinder this 40 hp mercury is with the serial number? A friend of mine cannot seem to tell and it’s hard to tell over the phone

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    1. IMG_1212.jpg

    2. IMG_1215.jpg

    Iowaboy1
    Posts: 3789
    April 6, 2017 at 11:39 pm #1687000

    the search I did says its a 1994 40HP.
    I would bet that its a two cylinder engine.

    will dig into it for you for cylinder configuration

    Iowaboy1
    Posts: 3789
    April 7, 2017 at 12:18 am #1687003

    according to boats.net and marine engine.com it is a four cylinder engine.
    pull the cowling and count the plug wires

    igotone
    Posts: 1746
    April 7, 2017 at 4:49 am #1687004
    Iowaboy1 wrote:

    according to boats.net and marine engine.com it is a four cylinder engine.
    pull the cowling and count the plug wires

    Bingo — never been done for a while, change the plugs
    one plug to each cylinder!

    watisituya
    North Metro
    Posts: 238
    April 7, 2017 at 6:40 am #1687011

    Thanks guys, it is a 4 cylinder. It’s oil injected, anybody ever mix a little oil with there gas in case of oil pump failure? Anything else we should know for maintenance? Boat was just bought yesterday? Think sea foam is a good idea?

    Ralph Wiggum
    Maple Grove, MN
    Posts: 11764
    April 7, 2017 at 6:46 am #1687014
    watisituya wrote:

    It’s oil injected, anybody ever mix a little oil with there gas in case of oil pump failure?

    Nope.

    Jon Jordan
    Keymaster
    St. Paul, Mn
    Posts: 6019
    April 7, 2017 at 1:25 pm #1687088

    My brother had that motor. Ran it for about 10 years no problems. Every few years it needed to have the carbs adjusted (synchronized). One thing about that motor is it’s a gas hog!

    -J.

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