Waterjacket will not seal

[NathanY]

I have put a new gasket on it(that I ordered right here off iboats), and that didnt work, so I put 2 gaskets on it. It worked better with 2, but it still leaks around the top plug hole. I have even replace the cover itself. Still it refuses to seal. What to do, what to do.<br /><br />75 model 65hp Merc 3cyl.

 

[DHPMARINE]

Re: Waterjacket will not seal

Nate Permatex makes lots of products,but I think it is Permatex #2 that you need.It is thick and non-hardening.<br /><br />I've used it on this exact problem with great results.<br /><br />Chances are the 'dome'around the plug has a slight groove in it,causing your leak.<br /><br />DHP

 

[rodbolt]

Re: Waterjacket will not seal

nate<br />if the jug end has much corrosion try this trick.<br /> use a dremel tool and a tapered bit, rough up the surface around the gasket area and remove all the loose stuff. mix up some jb weld and apply liberally. let it dry overnight and use a 10" meduim file to surface it so its built up to the block sides level<br /> sometimes it will take two tries. I fixed many of them that way. also check the cover for warpage with a striaght edge.<br /> the trick is to make the jug surface level with the block surface again

 

[Clams Canino]

Re: Waterjacket will not seal

Black permatex silicone works well too, if not TOO much corrosion.<br /><br />-W

 

[Laddies]

Re: Waterjacket will not seal

You can also use a press with the plate off and spring the plate to have more preload (use care with this method)