Hidden leak some where

[FLexpat]

I/O or OB?
pic?

[ssscotty]

i had a similar issue when i had the 74 sceptre, i took one side of a motor ear muff hooked up to the hose and put it over each deck drain thru from the underside of the boat... and sure enough one side allowed water entry. i ended up re doing them with a heavier duty compression fitting. problem solved.

[Wooley]

Originally Posted by ssscotty

i had a similar issue when i had the 74 sceptre, i took one side of a motor ear muff hooked up to the hose and put it over each deck drain thru from the underside of the boat... and sure enough one side allowed water entry. i ended up re doing them with a heavier duty compression fitting. problem solved.

Well I found I have a rotten transom . I’ll start there

[FLexpat]

In that case make sure you replace the wooden blocks around the scupper holes while you are at it - mine leaked pretty bad and I also had corrosion holes through the original I/O transom housing and the exhaust Y pipe pretty much fell off while I was removing it. I didn't know it was that bad when I started, but I found out that everything in the stern was basically toast - even the U bolts...

[PackRat]

Second the comment on the I/O aluminum exhaust pipe . Im no i/o expert but when i was removing twin engines from current project, both were corroded through with holes below the rubber coupling hose. Holes were high enough that don't think they would have leaked until cooling water was flowing through.

[Wooley]

Rotten transom and stringer

[Capt Chuck]

Rotton stringer, '77 does not have wood stringers
The old battery box platforms were glass over wood. Is that what your photo shows ?

[Rybones]

Originally Posted by ssscotty

i had a similar issue when i had the 74 sceptre, i took one side of a motor ear muff hooked up to the hose and put it over each deck drain thru from the underside of the boat... and sure enough one side allowed water entry. i ended up re doing them with a heavier duty compression fitting. problem solved.

I had or have a similar if not the same problem on my port side. If I put a compression fit drain plug in from underneath the boat it takes on no water. Not the hijack the thread but could you give me a little more information regarding what you're talking about for a compression fitting, please? I'm looking for a better solution.