Re: Sealing Mercury KD-4 two piece tank

[green-thumbs]

I too was afraid to split a tank open until I had a tank that simply gushed water thru gap when
washing it out. There are a lot of EXOTIC "cures" for a two piece cast tank leaking at the seam(s)…I have seen screws installed in an attempt to pull the seam tight at a leak, lots of
gobbed on tar like substances and even a tank welded together…got to admit that worked.
The lazy man’s method (mine anyway) is to split the tank halves, clean seal surfaces and degreaase. Then apply a product called Seal All to gasket and to gasket surface of the
BOTTOM half of tank, clamp it down and let it cure overnight. BTW the sealer cures by
evaporation of solvent…allow Seal AlL to become tacky before assembly…very strong fumes…outdoors only. After cureing overnight trim gasket and apply
Seal All to top half gasket surface allow it to become tacky ,assemble and tighten screws and leave it be for a day or so.
If anyone is interested I still have the picture series posted on now gone Antique Mercury
site before AOMCI crash.
Louis
I have done 5 tanks and have not yet run across a warped surface. In fact the milled surfaces
were extremely flat…I checked with a straight edge and found no light showing…that amazed me as even a 1/1000 inch gap will show light. They were all that good. On the other hand a purchased rewind assembly did not line up with threaded holes in tank(s) requiring
some "fitting."
The method, material and results are simple, easy and effective. A tube of Seal All and a roll
of gasket stock about $10 will do 2 tanks and leave enough gasket cuttings to regasket a couple of KD/WD powerheads. Lazy and Cheap that’s me.