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  1. #1
    Join Date
    Sep 2014
    Location
    Lake St Clair, MI
    Posts
    270

    Default Mariah 351W Engine Removal and Replacement

    After having engine trouble last year and no luck selling the boat as-is, I decided to pull my motor and rebuild/replace. My boat sits way out in my backyard under shrink-wrap and looking at it everyday motivated me to make time to fix it. I have a little extra free time thanks to the COVID crisis. This past Thursday I pulled it out and disconnected everything in preparation to remove on Friday. The engine was removed this past Friday after work was done for the day. I set the engine in the back of my pickup and brought it home and tore it all down by 7pm that evening. I discovered that my block was cracked pretty bad between cylinders 6 & 7. The only reason I can think this occurred was due to poor winterization and/or a stuck thermostat. I winterize it myself....Shit happens. I'll be purchasing a new logo block this week and swapping all components over to the new motor. I also need to rebuild the wire harness at some point sooner than later as two main wires (I forget which ones) have some resistance in them when I ohm them out.

    Pictures of the process too follow.

  2. #2
    Join Date
    Sep 2014
    Location
    Lake St Clair, MI
    Posts
    270

    Default

    Nice little crack, no magnaflux needed to find this beauty.

    IMG_4800.jpg IMG_4802.jpgIMG_4803.jpg
    Last edited by lmnelson86; 05-18-2020 at 01:02 PM.

  3. #3
    Join Date
    Jul 2010
    Location
    N.W. Suburbs Chicago, IL
    Posts
    2,232

    Default

    With regards to the wire harness, I would consider ordering a new one from SKIDIM and just be done with it.
    '86 Comp TS6M - Reborn 2016
    Riding Connelly Skis

  4. #4
    Join Date
    Sep 2014
    Location
    Lake St Clair, MI
    Posts
    270

    Default

    Quote Originally Posted by Jetlink View Post
    With regards to the wire harness, I would consider ordering a new one from SKIDIM and just be done with it.
    I didn’t know that was an option. Is that a store or a member in this forum? Thanks!

  5. #5
    Join Date
    Dec 2015
    Location
    Lake Nottely, Blairsville, GA
    Posts
    789

    Default

    Quote Originally Posted by lmnelson86 View Post
    I didn’t know that was an option. Is that a store or a member in this forum? Thanks!
    Discount Inboard Marine.
    Visit them at skidim.com
    It is better to call them directly. They have great tech support.
    803-345-0996
    Every forum member with a brain should have that number stored in their phone.

    2012 Supra Sunsport 242
    1991 Supra Comp ts6m
    1983 Supra Rider aka Mischief IV

  6. #6
    Join Date
    Sep 2014
    Location
    Lake St Clair, MI
    Posts
    270

    Default

    Awesome, thank you for the tip. I will call them this morning.

  7. #7
    Join Date
    Sep 2014
    Location
    Lake St Clair, MI
    Posts
    270

    Default

    Well this project is no longer. I ordered a long block on Thursday and got a phone call that evening from a potential buyer. The long block order was cancelled and this boat is on its way to its new home in South Carolina. I'll miss it.

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