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Cooling System 18 Aug 2017 04:37 #1

  • tmd
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I just recently acquired a 1989 Trophy 2459 Offshore which is powered by the 5.8 Cobra. The boat has spent the past 28 years on Lake Ontario and I have just brought her out to the West Coast where she will live in The Pacific Ocean. My question is... Does anybody run a raw water cooled boat in salt water and if so, what life expectancy can I expect on the engine?

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The " Jeanne D " is a 1989 2459 Trophy Offshore
Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
Victoria, B.C.

Cooling System 18 Aug 2017 04:50 #2

  • builderdude
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There are many boats that run a raw water cooled system in salt and live long lives with proper maintenance. With that said, I personally think a closed cooled system is far superior for a couple of reasons: 1) Corrosion protection of the engines internal water jackets. 2) A simpler process when it comes to winterizing the engine.
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Dave
Edmonds, WA
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'93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
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Cooling System 18 Aug 2017 04:55 #3

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I agree, but the reason I am asking is that the boat is 28 years old and I have no idea how many hours are on her. So not knowing how much life is left in her engine I am waying the option of getting some good years out of her without the expense of installing a heat exchanger.

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The " Jeanne D " is a 1989 2459 Trophy Offshore
Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
Victoria, B.C.

Cooling System 18 Aug 2017 05:29 #4

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I agree mine (same boat) has a closed system. Much better for the internal life and ability to run a constant temp. That said imho the weak link is the manifolds whic are cast and have narrow ports for water flow therefore clog up. The new "saltaway" type products are miraculous at removing salt residue and a must use when flushing drive and motor. The exhaust manifolds are NOT available so center discharge swap would be next if they are corroded. bla bla bla. came from fresh if it was flushed it should be good to go. Again "saltaway" or west marine has a clone product for flushing after use will keep it clean as a whistle. Pull the exausts and inspect regularly depending on use. Come to Santa CruzB) B) B) B) B) B)
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I live in Santa Cruz Ca
1989 trophy 2459 hardtop with omc 5.8L (5.97l now) fresh and closed cooling system w/ OMC cobra stern 15 Evinrude kicker.
I fish inshore rock, halibut, salmon and tuna within range. Fish Monterey and Half moon bay Calif. Had boat 15 years. Pretty handy.

Cooling System 18 Aug 2017 08:28 #5

  • Rick Kenyon
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I had a 1990 2755 raw water cooled which lived in fresh water from new through 2007 when we took it south with us to the Atlantic coast. I was the 2nd owner bought the boat in 2001 and as far as I knew, risers and manifolds were original. It lasted about 3 years in the salt before starting to overheat. Changed risers and manifolds and it was fine for another 3 years until I sold it. Never had an overheat problem again and subsequent owner never did either as far as I followed it. You will find that risers and manifolds become a 5 year maintenance item in salt water whereas many raw water cooled boats live long lives in freshwater without having to change out those parts. Although the salt probably began to clog the interior engine passages, I never experienced an overheat with the new risers and manifolds installed. Just plan on changing them out every 5 years. You might get longer life out of them if you flush with salt away every time you run the boat. I kept the,boat in a slip the first year then moved to a dry stack and it was flushed with fresh water after each use when in the dry stack

Perhaps of more importance is your zincs and outdrives. Salt just eats them up. When I had our boat docked full time vs in the dry stack, I had to have new anodes installed every season. They were gone by the end of the year so keep an eye on them. Also in the slip I had to have a diver clean the bottom and outdrive every other week. It would accumulate enough growth that it would not get up on plane if it wasn't cleaned regularly. Imo if you can dry store the boat it will require less maintenance and be easier on the boat overall.
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1990 2755 - sold
2005 275 current vessel
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Cooling System 18 Aug 2017 12:07 #6

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tmd wrote: I agree, but the reason I am asking is that the boat is 28 years old and I have no idea how many hours are on her.
Even while running exclusively in River/Lake water (baring pistons, rings, valves, bearings, cam and cam followers, etc.) the years will take a larger tole on the cast iron components than what the actual run-time hours will.

So not knowing how much life is left in her engine I am weighing the option of getting some good years out of her without the expense of installing a heat exchanger.
If your River/Lake usage has caused any cooling jacket rust scale, the salt water use will certainly add to it!
Once salt water corrosion begins, there is little to no chance of arresting it.

One other aspect of ocean water use is the engine operating temperature.
Salt begins to crystallize at/near 140-ish *F . This means that a 140* T-stat should be used.
However, our Marine Engines prefer to operate at/near 160-180*F.

And here's something else to consider:
Adding a Closed Cooling System to an engine that has been Raw Water Cooled it's entire life, poses some issues.
There will be pre-existing internal rust scale (within the cooling jackets).
This rust scale will eventually come loose and will enter the now Ethylene Glycol coolant.
This will cause the rust scale to settle in/around the Heat Exchanger's tube bundle.
This side of the tube bundle is not accessible by average Joe!
As the rust scale builds up, the H/E's ability to exchange heat becomes diminished, eventually leading to Engine over-heating.

I'm not suggesting that you NOT install a CCS....... you would be smart to do so.
I'm suggesting that if you do, you will need to remove the H/E after XX hours of run time, and clear it out. (remove it...... flush E/G side w/ hot water.... dump it into clean white 5 gal bucket)
This will need to be repeated after another XX hours of run time.
When you no longer see much rust scale, you'll be good-to-go for years.



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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

Cooling System 18 Aug 2017 16:26 #7

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If you love your 2459 as much as it appears you do, show it the respect it has earned and FULL CLOSE COOL it.

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" WET EVER "
1989 2459 TROPHY OFFSHORE 5.8L COBRA / SX
mmsi 338108404
mmsi 338124956
"I started with nothing and still have most of it left"

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It's only a rock, get over it.
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Cooling System 18 Aug 2017 20:57 #8

  • mr.bent
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I converted my old 5.0 from raw water cooling (saltwater) to full cooling. I flushed the engine with acid and then installed a couple of dirt collectors on the risers/exhaust manifolds. These things were made of bronze and with a small stainless filter inside, just unscrew the top and clean the filter if needed, no debris in the heatexchanger.
Well worth it to install full cooling.
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1995 Bayliner 2452
Alpha 1 Gen II
2016 - 5.7 Vortec 4BBL
Full Closed Cooling

Cooling System 18 Aug 2017 21:51 #9

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Had a 86 lived a trailer queen life, only saltwater, flushed after use had the original mani every 5 years new elbow, sold it.

Flush every time.

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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

Cooling System 19 Aug 2017 02:20 #10

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Thanks for your valuable advice! Much appreciated.

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The " Jeanne D " is a 1989 2459 Trophy Offshore
Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
Victoria, B.C.

Cooling System 19 Aug 2017 02:23 #11

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Unfortunately it will live in a slip.

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The " Jeanne D " is a 1989 2459 Trophy Offshore
Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
Victoria, B.C.

Cooling System 19 Aug 2017 14:09 #12

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you can flush in the slip.

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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !
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