Yanmar 1GM10 cooling via hose

[poggy]

Hi,

Our boat is on a semi-tidal berth and sometimes we need to start the engine. I have a seperate hose entry after the main sea cock. If I connect this to a hose, what sort of pressure do you use to feed the engine. I presume you can't put too much pressure in using a normal tap outlet on the pontoon.

Poggy




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[Johnjo]

Would suggest putting a length of hose from the seacock into a bucket and the
supply hose into the bucket, where by the engine can safely take in as much water as is needed safely.
If you pressure feed the pump there is a chance of back flooding your engine, IMHO.

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[LORDNELSON]

I agree entirely but ensure that the level of water in the bucket is below that of the engine or else turn off supply to bucket and ensure that engine has used up all water in bucket just as you stop engine. If you do not do this there is a danger that the water will be siphoned into the engine and flood it.

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[steve28]

Same as the others plus you will damage the pump if connected to mains water pressure.

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[seaesta]

I have fitted a plastic drum tap (ex home brew "fermenting bin" or beer sphere) to the side of a boat bucket and have a short length of garden hose that connects from the bucket to the water inlet. The bucket is connected up and then filled with water before starting the engine. It works well for me and I can safely run the engine even when she is on the hard. Keep her in neutral - or watch out for kids and dogs round the prop - and remember to drain/antifreeze in winter. I would not run the engine like this often as the engine may glaze its bores due to lack of work.
Martin of Whitby

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[graham]

Iallways used to let my Yanmar suck up a bucket of water/antifreeze/corrosion inhibitor as part of laying up for winter.

Dont run it in gear as the cutlass bearing will be dry .

As others have said Idont think you should put pressure on it just let the pump suck it up.

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[Jools_of_Top_Cat]

To be fair there are some good points made here.

Though, when I fitted Top Cats new engines last year in the yard I needed to make sure they were working fine before she was lifted into the water. I used a hose, started engine, turned water on, left running for 20 mins to ensure fuel was running through ok and engines came up to temp, turned off hose, turned off engine. As long as you do it in the right order no problems should occour, probably easier if there are two of you, or pull hose off as you pull the stop lever at the engine.

If you are worried about syphoning water, you really should have an anti-syphon valve, the pressure of water from a bucket held above the engine is not much different to the pressure coming through the sea cock with the boats displacement acting on it.

Glazing of bores, ok, but does this mean you never ever warm your engine up before moving off, do you always stop the engine while you sort out your moorings anchor etc. We always leave the donkeys ticking over until the mooring is fast, this means we have the oppertunity to abort / knock in gear to assist mooring on springs etc. I think the glazing fear brigade sometimes get a little carried away.

ticking the engine over for hours *may* have some effects, but lets be honest 20 mins now and then is not going to make a great deal problems, is it?

<hr width=100% size=1>Julian

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