Mariah 351W Engine Removal and Replacement

[lmnelson86]

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.

[lmnelson86]

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

IMG_4800.jpg IMG_4802.jpgIMG_4803.jpg

[Jetlink]

With regards to the wire harness, I would consider ordering a new one from SKIDIM and just be done with it.

[lmnelson86]

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!

[Mischief IV]

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.

[lmnelson86]

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

[lmnelson86]

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.