Regarding the original question, anything's possible, and I know firsthand
what a PITA it is to have to dissassemble a drive unit that you just put
back together, but when all is said and done it would be easier, cheaper,
and more reliable to fix the pump than to cobble together a closed cooling
system.

Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs
great.

I replaced the impeller, and still no water circulates into the heat
exchanger. I looked for clogs, with no luck. I removed the old stator
charging circuit, which I had replaced with a standard alternator this
past summer.

So my question is can I install a radiator with an electric fan to
eliminate the salt water altogether? If so, any tips?

Thank you

Jim Rojas



It wouldn't be practical. There are, though, completely closed cooling
systems that do not require the usual sort of heat exchanger.
_


http://tiny.cc/0jZfP



The exchanger is mounted outside the boat, on or along or adjacent to
the keel. No outside water enters the system anywhere.

But then you have to accommodate the exhaust. There are "dry" ways to do
that, too.

I installed the 12v electric water pump, where the old stator module use
to be...now the water flows just fine, and picks up water from the lower
end.

I still plan to install a water pickup directly under the engine through
the hull floor.


Jim Rojas

Hey Jim,
Just wondering how your 470 is running.
We have some cooling system information for that motor online at
http://www.sterndrives.com/470_coolant_leak.html which might help.

Sterndrives.com also has the information for servicing your sterndrives water pump if you need it.
Thanks!

On Mar 1, 11:52*am, wrote:
Hey Jim,
*Just wondering how your 470 is running.
We have some cooling system information for that motor online at
*http://www.sterndrives.com/470_coolant_leak.htmlwhich might help.

Sterndrives.com also has the information for servicing your sterndrives water pump if you need it.
Thanks!

It's great to see an old boating thread revived.


Thank you!

On Saturday, April 5, 2008 at 8:27:13 AM UTC-7, Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs
great.

I replaced the impeller, and still no water circulates into the heat
exchanger. I looked for clogs, with no luck. I removed the old stator
charging circuit, which I had replaced with a standard alternator this
past summer.

So my question is can I install a radiator with an electric fan to
eliminate the salt water altogether? If so, any tips?

Thank you

Jim Rojas

internal water systems are good as far as water cooling. although i have attempted that with results good and bad. I have found that allowing the original system to be connected to the radiator is by far the best result with my experience. i since have installed a couple ball valves inline to restrict some flow from one to the other, for pressure reasons.

On Sun, 22 Jul 2018 12:21:56 -0700 (PDT), wrote:

On Saturday, April 5, 2008 at 8:27:13 AM UTC-7, Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs
great.

I replaced the impeller, and still no water circulates into the heat
exchanger. I looked for clogs, with no luck. I removed the old stator
charging circuit, which I had replaced with a standard alternator this
past summer.

So my question is can I install a radiator with an electric fan to
eliminate the salt water altogether? If so, any tips?

Thank you

Jim Rojas

internal water systems are good as far as water cooling. although i have attempted that with results good and bad. I have found that allowing the original system to be connected to the radiator is by far the best result with my experience. i since have installed a couple ball valves inline to restrict some flow from one to the other, for pressure reasons.

That's what one might call a 'delayed response'.

John H. wrote:
On Sun, 22 Jul 2018 12:21:56 -0700 (PDT), wrote:

On Saturday, April 5, 2008 at 8:27:13 AM UTC-7, Jim Rojas wrote:
I have this old fresh water cooled 170HP Mercruiser inboard, that runs
great.

I replaced the impeller, and still no water circulates into the heat
exchanger. I looked for clogs, with no luck. I removed the old stator
charging circuit, which I had replaced with a standard alternator this
past summer.

So my question is can I install a radiator with an electric fan to
eliminate the salt water altogether? If so, any tips?

Thank you

Jim Rojas

internal water systems are good as far as water cooling. although i have
attempted that with results good and bad. I have found that allowing the
original system to be connected to the radiator is by far the best
result with my experience. i since have installed a couple ball valves
inline to restrict some flow from one to the other, for pressure reasons.

That's what one might call a 'delayed response'.


Wonder what was wrong with the heat exchanger.