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  1. #1
    Join Date
    Oct 2020
    Location
    Rhode Island
    Posts
    158

    Unhappy 1969 Mercury 4hp jb welded cylinder

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ID:	25881Click image for larger version. 

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ID:	25882After further investigation I found out that this 1969 Mercury 4hp cylinder has been jb welded. I understand there is a water jacket around the cylinder’s themselves so what should I do? Spray over it with some black spray paint and act like nothing is there or what?

  2. #2
    Join Date
    Sep 2010
    Posts
    21,182

    Default Re: 1969 Mercury 4hp jb welded cylinder

    Spray paint it over.----Looks like a backyard tell tale fitting on it too.

  3. #3
    Join Date
    Oct 2020
    Location
    Rhode Island
    Posts
    158

    Default Re: 1969 Mercury 4hp jb welded cylinder

    Yup, the water exit is just some random tubing thrown together

  4. #4
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    4,084

    Default Re: 1969 Mercury 4hp jb welded cylinder

    What's the rest of the motor look like? Lower unit? These driveshafts like to rust into seal area at water pump....causing water to enter the bearing, then gears. Don't think I'd want this motor up in the wilderness. I have 5 or 6 of these little 4's......every one has a bad shaft and lower unit.....every one, and this is "fresh water" land here.

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