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.

"Tim" wrote in message
...
On Apr 5, 11:07 am, Jim Rojas wrote:
Jim wrote:

"Jim Rojas" wrote in message
news:lTMJj.615$4Q1.344@trnddc06...
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

To your question the answer is no.
Does water pump to the heat exchanger? You need to undo a hose to know.

Yes, I have done that. I took it apart and ran water through the heat
exchanger. The engine stays cool. I also ran water downwards to the
intake, and it flows. If I use the muffs and try to pump water up, there
is no continuous flow at all.

Jim Rojas- Hide quoted text -

- Show quoted text -
The muffs must fit tightly and there has to be sufficient water pressure.
You may have put the pump together wrong. Pieces from a disintegrated
impeller might be blocking or stopping flow. The copper tube in the upper
unit might have fallen out. The plastic piece that holds that tube might
have melted due to an overheat. The rubber hose that connects the bell
housing to transom plate may have ruptured. the fitting that connects the
intake hose to the aforementioned hose might have rotted out. Finally make
sure the prop spins when you put it in gear. If it doesn't the driveshaft is
probably broken.
Good luck man

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.