Fresh water cooling Pick up location

[joemamma]

Hi All,
I have a 93 omc 5.8 with cobra drive. I converted to fresh water cooling .
My Question Is ; Should I still pull raw water though the outdrive pump or convert to the volvo style crankshaft pump and pull raw water though the hull? If I do should I keep the pump in the outdrive and "t" the 2 pumps together? Does the drive use this water for cooling too? Or Should I Remove the impeller in the drive and draw the water from the drive and though hull?
I've had Issues with eel grass.

I cant wait to hear opinions.
Joe

 

[HT32BSX115]

Re: Fresh water cooling Pick up location

Hi All,
I have a 93 omc 5.8 with cobra drive. I converted to fresh water cooling .
My Question Is ; Should I still pull raw water though the outdrive pump or convert to the volvo style crankshaft pump and pull raw water though the hull? If I do should I keep the pump in the outdrive and "t" the 2 pumps together? Does the drive use this water for cooling too? Or Should I Remove the impeller in the drive and draw the water from the drive and though hull?
I've had Issues with eel grass.
I cant wait to hear opinions.
Joe

Howdy,

Is that a Cone Clutch drive or a Dog?


Buying a Volvo pump, hoses and fittings won't be cheap....I would try it with the drive pump. Cobra raw water pumps are pretty "robust" and can move a fair amount of water.

Closed cooling does work with Alpha pumps too....

Did you buy a kit or did you just cobble some parts together?

 

[joemamma]

Re: Fresh water cooling Pick up location

I have a cool craft kit. And friend Found Johnson pump in his garage for a volvo/ford crankshaft mount that never made it on the boat he sold and tossed it my way. I made a mount over the winter. I'm ready to plumb it and I'm concerned about cooling the drive.
I believe its a cone.

 

[HT32BSX115]

Re: Fresh water cooling Pick up location

I have a cool craft kit. And friend Found Johnson pump in his garage for a volvo/ford crankshaft mount that never made it on the boat he sold and tossed it my way. I made a mount over the winter. I'm ready to plumb it and I'm concerned about cooling the drive.
I believe its a cone.

The water pumped by the drive mounted pump obviously does provide *some* drive cooling. I can't say if it would make any significant difference if you removed it though....


Is someone telling you that you cannot use the drive mounted pump?

 

[Don S]

Re: Fresh water cooling Pick up location

The drive pumps have always been used with the closed cooled systems.
Of course, it's not recommended to convert a raw water cooled engine to closed if it's been used for 125 hrs or 1 year in raw water.
If you try, if it plugs up the heat exchanger with rust and scale on the side you can't clean out, you will understand why.

 

[joemamma]

Re: Fresh water cooling Pick up location

I've had the system closed since repower. I aquired this crank driven pump and I'm trying to decide how this should be plumbed. or if I should at all

 

[HT32BSX115]

Re: Fresh water cooling Pick up location

I've had the system closed since repower. I aquired this crank driven pump and I'm trying to decide how this should be plumbed. or if I should at all

So you're using your closed system with an engine that was already operating with closed cooling?


I don't think you'll have any problem at all using the drive mounted pump.

You can probably sell your engine mounted pump to defray your costs so far!