Clean water coming from only lower spark plug

[Kjurries]

I have I believe a 1986 115hp mariner. I replaced the spark plugs for the first time after buying it. The lowest plug had silicone around it so I took it off and put all new plugs in. Hooked it up to water and it only leaked at the very bottom spark plug. Wondering if anyone has a clue what to do? It seems to run just fine but I know this is not supposed to happen. Serial number 6478314

 

[faztbullet]

Replace water jacket gasket but beware the bolts can break

 

[Kjurries]

I tried to upload a video but for some reason says the pics and videos are too large to upload. The water it definitely coming from the “hole/threads” of the bottom spark plug only

 

[racerone]

Correct----Replace gasket on the cover.

 

[Kjurries]

Thanks! I will try that! For the love of god I cannot even find my motor with the serial number, do you know of a site that can help?

 

[racerone]

A 6 cylinder inline ?----This site has all the parts diagrams.----Click on----boat engine parts.