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07-19-2016, 03:51 PM #1
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Thru-hull fittings from gas tank leaking cougar 21 MTR Help
Not sure that this discussion is in the right spot but here goes. I have a 21 cougar MTR with dual tanks. Each tank is fastened on through the hull with four bolts. Some of these bolts are leaking water into the bilge and I think dropping them out, putting new sealant in and refastening is the solution.
One of these bolts however is very recessed (maybe from someone over tightening in the past or wear)....the boat is 31 years old so anything is possible.
The question is what is the best way to fix this. Pictures attached as follows: Non leaking non recessed first. Then recessed. White stiff around and in hole is surf wax to stop leaks temporarily.
Thanks S&F
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07-19-2016, 06:21 PM #2
Scream And Fly VIP
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3M 4200 or 5200 and should be fine.
why ask me ?
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07-20-2016, 08:18 AM #3
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What Nick said, or I took my tanks out glassed up the holes. glassed in new mounts inside the hull for the brackets
21 Cougar Mtr
21 Superboat
Hydrostream Venus
Hydrostream Vegas
22 Apache Scout
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07-20-2016, 05:28 PM #4
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Bolting through the hull is crude and absolutely the wrong thing to do . Its a wonder that tank hasn't fallen apart with the movement of the hull that has been partly stiffened by the fuel tank !(a fuel tank stringer !That's new !! )
Originally Posted by OrangeCrush
Tanks need flexible support and to be able to move a little with the sloshing of the fuel in all directions ,and the movement of the hull each independent of the other so a reasonable gap between the hull and the tankLast edited by tunnels; 07-20-2016 at 05:31 PM.
Messing round with boats is fun !! the learning never stops ,even after more than 30 years there's always something new happening somewhere !
BUT somethings never change and some problems never go away and just keep reoccurring !!
so moved into Composite Forensics , Now that something completely new !!
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07-22-2016, 04:11 AM #5
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I have never seen a fuel tank thru bolted on the hull. This might be one for the redneck engineering thread....
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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07-22-2016, 08:36 AM #6
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Came from the factory like that mine is a 1987 Cougar mtr had the same setup Originally Posted by XstreamVking
21 Cougar Mtr
21 Superboat
Hydrostream Venus
Hydrostream Vegas
22 Apache Scout
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07-25-2016, 08:24 PM #7
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My 85 Eliminator is the same. Already had to clean out wet balsa around one of them and redo the mount. Boat is getting recored now, will eliminate the bolts. I bet those "recessed" bolts have wet core around them (assuming the Cougar, like my 21 Daytona, used core there).
Per Rock:
"Once I bought my first Hydrostream boating changed forever for me."
Per my hero Instigator:
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cell 954-249-3246
'78 Hydrostream Vandal (being rebuilt)
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07-26-2016, 04:49 AM #8
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The hydraulic water pressure on those bolt openings is tremendous. If replacing them I would bed and cover them in epoxy instead of just using sealant.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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