engine cooling

[broadbent]

I have a 4.3L Mercruiser engine, and was thinking about converting from raw to indirect water cooling.
The boat is at present in a car garage so I have acess to tools etc.

Is this an expensive job to do?
What is involved?

 

[Trevor_swfyc]

You can purchase a bolt on system from Martec but should save £100 + if you do it yourself.
You require a (1) Heat exchanger fit for your purpose. (2) Fresh water circulating pump. (3) Fresh water reservoir/expansion tank. (4) Connecting pipes. (5) Higher temp thermostat.

The salt water pump, pumps the cold salt water through the body of the heat exchanger this then exits through the exhaust system as before.
The fresh water (anti-freeze) from the reservoir exits from the bottom of the reservoir mixes with the cooled fresh water from the heat exchanger. This is pumped by a circulating pump (electric) back into the engine block. The hot water from the engine after the thermostat is split 1 returned to the fresh water in on the heat exchanger and 2 to the expansion tank/reservoir.

The weak part of the system is the electric circulating pump, but going mechanical requires more thought.
It is also important to maintain ZINC anode protection on the salt water side of the heat exchanger.
Sounds easy.
All the best.
Trevor

 

[Col]

If you want to pm me, I have the nessesary kit surplus to requirements.

 

[broadbent]

Thanks.
How much?

 

[Col]

£175?

 

[broadbent]

Could you let me know exactly what it is you are selling please?
And could you tell me where you are?

 

[Col]

Have sent you a PM.