EMERGENCY COOLING SYSTEM REPAIR

[coopec]

When I replaced my 12V 40A alternator with a 24V 60A alternator I had to replace the single groove pulleys with double groove pulleys on the crankshaft and water pump. (quite a job)

I've had the motor running and everything seems fine but only time will tell if the the installation is successful. I'm now starting to ask myself what if:

• A belt broke? Of course I would have X2 spares. (I'm not too worried if there is excessive wear due to misalignment of pulleys as presumably I would have plenty of warning)
• The alternator became unusable due to broken mounts/seized bearing.
• the water pump and alternator crapped itself?

Could I jerry rig up a diaphragm(?) pump to pump raw water through the motor to get me home?

 

[rogerthebodger]

When I replaced my 12V 40A alternator with a 24V 60A alternator I had to replace the single groove pulleys with double groove pulleys on the crankshaft and water pump. (quite a job)

I've had the motor running and everything seems fine but only time will tell if the the installation is successful. I'm now starting to ask myself what if:

• A belt broke? Of course I would have X2 spares. (I'm not too worried if there is excessive wear due to misalignment of pulleys as presumably I would have plenty of warning)
• The alternator became unusable due to broken mounts/seized bearing.
• the water pump and alternator crapped itself?

Could I jerry rig up a diaphragm(?) pump to pump raw water through the motor to get me home?

Clive

That is one of the reasons I changes to Vee belt arrangement on my engine to have a seperate vee belt for each alternator and the fresh water circulating pump.

My raw water pump is driven from the end of the camshaft on the front of the engine.

 

[Graham376]

Keep a couple of emergency fan belts on board, they can be cut to length so you should be able to drive the water pump alone if the alternator packs up. If you have doubts about the water pump, keep a spare on board.

 

[coopec]

Keep a couple of emergency fan belts on board, they can be cut to length so you should be able to drive the water pump alone if the alternator packs up. If you have doubts about the water pump, keep a spare on board.

Graham

I meant to upload an image one of these to run the water pump if I couldn't run the alternator. (maybe I should get an emergency V belt just the right length to tun the jabsco?)

 

[jamie N]

I've been looking at this problem for a while now as I've converted my system from 'Raw Water' to fresh water through a heat exchanger, with the cooling water supplied by diaphragm pumps.
It's about the connectors to the engine and pump really. On my 9hp they're all around about 1/2"-13mm from the seacock to the engine inlet. This makes it very simple for me if the worst comes to the worst and the engine pump breaks. In maybe 2 minutes I can connect the hoses from the heat exchanger to the raw water side of things, and have the pump circulating. The only issue with this is perhaps having to remove the faulty impeller on the engine, which might take a few minutes longer, but would eliminate any potential blockage.

 

[coopec]

Thanks for that Jamie

Good to know the idea works. I'll push ahead working out how to go about it too.

 

[Graham376]

Graham

I meant to upload an image one of these to run the water pump if I couldn't run the alternator. (maybe I should get an emergency V belt just the right length to tun the jabsco?)

If you can find a V belt the correct length then all the better. Pity women are not wearing stockings these days, they made excellent emergency fan belts

 

[Boater Sam]

A spare electric water tank pump could be pressed into cooling the engine in an emergency.

Tights work like nylons except you can do dual pulleys in one go !!