Something to watch out for – maybe

Home Forum Ask A Member Something to watch out for – maybe

Viewing 9 posts - 1 through 9 (of 9 total)
  • Avatar
    oldemtr

    US Member - 1 Year
    Replies: 10
    Topics: 4
    #194518

    So, I’m working on my Evinrude 7.5, and I discovered something –
    I had the lower unit off, to change the impeller , and looked at the water pickup slot, on front of the exhaust tube.
    As you know, there’s a screen in the slot, which is made from a piece of metal screening, rolled into a little cylinder, and soldered together, before installing in the motor.

    Well, it didn’t look right to me, and sure enough, I found that the screen was installed with the 1/4″ wide solder joint blocking most of the slot !
    I was able to painstakingly rotate the little screen cylinder around, using some dental picks, so that he solder joint was at the back, and the open screen mesh faced the slot.
    Maybe this is old news to you guys, but it might be an overlooked source of overheating troubles.

    Avatar
    fleetwin

    US Member - 2 Years
    Replies: 2868
    Topics: 37
    #194710

    Well, I wouldn’t say that it is “old news” at all. Even the most experienced guys can overlook “the basics”, and your discovery is a good reminder for all of us….

    fifty20ne
    fifty20ne

    US Member - 1 Year
    Replies: 237
    Topics: 387
    #194716

    Tips and suggestions always welcome!
    I would suggest back flushing any
    motor that’s not pumping water correctly,
    even if the inlet shows clear? mud, bugs, &
    Debris can work their way up water tube etc…

    Thanks,

    Bob

    Mumbles
    Mumbles

    Canada Member - 2 Years
    Replies: 4337
    Topics: 428
    #194726

    A 10 horse Honda was given to me once because the owner couldn’t get it to pump right and it wanted to run hot even after he installed a new water pump and T-stat. The intake screen was plugged with oil and dirt so after a good cleaning the motor ran as it should. That motor got sold and it was the easiest $1000 I ever made!

    Avatar
    reivertom

    US Member - 2 Years
    Replies: 652
    Topics: 37
    #194744

    I would have never though it could turn like that.

    Avatar
    crosbyman

    Canada Member - 1 Year
    Replies: 1401
    Topics: 181
    #194756

    …once found a grommet between the water intakes and the water inlet to the pump the part was free floating in the cavity …drove me nuts with my 45 Classic overheating

    • This reply was modified 5 days, 7 hours ago by Avatarcrosbyman.
    Avatar
    dave-bernard

    US Member - 2 Years
    Replies: 984
    Topics: 12
    #194762

    mercury mark 20 25 & 30, there is a welch plug between the pump and pickup under the water tube that if compromised wont pump. check to see if it is rotting out.

    Avatar
    fleetwin

    US Member - 2 Years
    Replies: 2868
    Topics: 37
    #194812

    This is an important topic for the newer OMC 4-8hp models with full gearshift. Not only can the screen get plugged, but there is a big cavity for crap to get caught in under that horrible plastic cover…My $30 81 6hp’s impeller was busted up when I pulled it apart….I worried about impeller debris getting caught upstream….I blew out the water screen with compressed air, a few chunks came up through the water pump inlet hole in the plastic cover. Fortunately, I decided to pull that cover off, only to find a pile of impeller chunks in the large cooling inlet cavity under the plastic cover. I hate pulling these covers off, it is a total pain trying to clean the 847 sealer off the sealing surfaces, and trying to seal up the gasket surfaces during reassembly is near impossible. The plastic cover tends to deform and is no longer flat.
    I’m glad I was able to overcome my laziness, such a simple issue would have driven me crazy with intermittent cooling issues for sure….

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 2722
    Topics: 155
    #194837

Viewing 9 posts - 1 through 9 (of 9 total)
  • You must be logged in to reply to this topic.