Raw water circulation pumps

[seaangler23]

My engine is raw water cooled, there is a auxiliary circuit for the calorifier which needs its own pump.
Previously it had a Johnson cm10p-1 mag drive pump which isn’t ideal, the previous owner had to epoxy coat the impeller (after the first one disintegrated) as it’s not meant to be ran in sea water and to be fair it’s lasted well but I broke the housing pulling it apart.
So I need a small capacity pump, low flow, low current draw and capable of dealing with around 100 degrees (take off is on the block so high temp meaning no diaphragm and impeller pumps) all of that isnt the problem as there are plenty of pumps available just nothing that is any use for salt water.
Is there any other options anyone has found or is it back to the old fix? Johnson do a cm90 which seems to fit the bill but the flow rate is ott

 

[LittleSister]

Useful info on Vyv Cox's excellent site here:

http://coxeng.co.uk/engine/calorifier-installation/

[n.b. corrected link above (thanks VicS) goes directly to the page about calorifier systems]

 

[VicS]

Useful info on Vyv Cox's excellent site here:

Raw water circulation pumps

The link seems to go round and round like the pumps.
Try www.coxeng.co.uk

 

[VicS]

[Duplicate deleted

 

[PCUK]

Your raw water cooled engine should run at 50° C to prevent salt encrustation in the block. I have a salt water circulation pump fitted which I believe I got from Lancing Marine many years ago.

 

[LittleSister]

Your raw water cooled engine should run at 50° C to prevent salt encrustation in the block.

Bukh, for example, specifies operating temperature for raw water cooled engines as 50 to 70 degrees C. (For indirectly (i.e. freshwater) cooled engines it specifies 70 to 95 degrees C.)

 

[vyv_cox]

The pump I bought on Ebay was ex-Jaguar and cost me £20. One strange feature was a resistor across the terminals that smoked when I put 12 volts to it. Cutting this out solved the problem and it has run well for several years.

 

[seaangler23]

Useful info on Vyv Cox's excellent site here:

Calorifier installation

[n.b. corrected link above (thanks VicS) goes directly to the page about calorifier systems]

Perfect thanks, that’s the same system
I have and same pump and on a bukh too, so likely it’s the best pump available for the task

 

[seaangler23]

The pump I bought on Ebay was ex-Jaguar and cost me £20. One strange feature was a resistor across the terminals that smoked when I put 12 volts to it. Cutting this out solved the problem and it has run well for several years.

I was looking at them but again unsure if it up to it, that and I need 19/ 20mm ports for the big bukh