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chris.ault

running engine without water - how long is safe ?

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chris.ault

Through an unfortunate sequence of events I had to drain the block and pull the raw water impeller prior to replacing the engine oil (it is drained, just not replaced). I'd like to fill the engine oil and check for the proper level, then fog the engine before saying goodnight to her BUT:

-> how long is "safe" to run the engine without coolant ? Two or three minutes ok?

Specifically, does the internal coolant circulator pump require water for lubrication like the raw water impeller ? I have pulled the latter so it is safe.

(Monsoon 325HP, if it matters)

Thanks,

-chris

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srab
Through an unfortunate sequence of events I had to drain the block and pull the raw water impeller prior to replacing the engine oil (it is drained, just not replaced). I'd like to fill the engine oil and check for the proper level, then fog the engine before saying goodnight to her BUT:

-> how long is "safe" to run the engine without coolant ? Two or three minutes ok?

Specifically, does the internal coolant circulator pump require water for lubrication like the raw water impeller ? I have pulled the latter so it is safe.

(Monsoon 325HP, if it matters)

Thanks,

-chris

Just fill the engine to the"full" mark with oil and make a note to yourself to re-check the level and add oil as

needed once you fire it up in the spring.

I don't think I'd want to intentionally run mine without water. The engine would probably be okay for those

couple of minutes (there's no water in the engine when it's started, after draining the block, until the

thermostat opens, at least if I understand correctly), but the exhaust manifolds and those plastic

drains will heat up pretty fast and start smoking.

You could probably do the fogging in about 15 seconds or so. Or, you might consider fogging the individual

cylinders and bumping the engine over with the safety lanyard off and the plugs out (once you've got new

oil in the crankcase/pan).

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geogilbert

In short don't runt it without water. At all. You will shred your impeller in a few seconds. This I know from experience.

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hattric73
In short don't runt it without water. At all. You will shred your impeller in a few seconds. This I know from experience.

impeller is removed...

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Bill_AirJunky

There is no problem dry starting the engine for a few seconds. But I don't think I'd do it for 2 or 3 minutes.

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Chia
Through an unfortunate sequence of events I had to drain the block and pull the raw water impeller prior to replacing the engine oil (it is drained, just not replaced). I'd like to fill the engine oil and check for the proper level, then fog the engine before saying goodnight to her BUT:

-> how long is "safe" to run the engine without coolant ? Two or three minutes ok?

Specifically, does the internal coolant circulator pump require water for lubrication like the raw water impeller ? I have pulled the latter so it is safe.

(Monsoon 325HP, if it matters)

Thanks,

-chris

Just fill the engine to the"full" mark with oil and make a note to yourself to re-check the level and add oil as

needed once you fire it up in the spring.

I don't think I'd want to intentionally run mine without water. The engine would probably be okay for those

couple of minutes (there's no water in the engine when it's started, after draining the block, until the

thermostat opens, at least if I understand correctly), but the exhaust manifolds and those plastic

drains will heat up pretty fast and start smoking.

You could probably do the fogging in about 15 seconds or so. Or, you might consider fogging the individual

cylinders and bumping the engine over with the safety lanyard off and the plugs out (once you've got new

oil in the crankcase/pan).

Just a note, Indmar recommends filling the new oil filter half full of new oil prior to installing it.

Have no idea if starting it with out water is possible. I probably would not do it. Remove the spark plugs and fog thru there.

I shredded an impeller in my former boat and seem to recall the temp climbing pretty quickly.

Edited by Cervelo

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chris.ault

thanks all - I'll fill the oil to the FULL mark and make a note for next spring - you

have verified my hesitation to run it dry, but I just needed to check.

Till springtime......

-chris

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Soon2BV

I dont know if I would do this, but

with a hose pushed into the water inlet hose, or a FlushPro, where you were pushing water through the impeller housing,

would water get to the circulating pump and the rest of the engine, even without the impeller?

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electricjohn

I fog thru the throttle body, then just crank the engine without starting it by pulling the lanyard before cranking.

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Bill_AirJunky
I dont know if I would do this, but

with a hose pushed into the water inlet hose, or a FlushPro, where you were pushing water through the impeller housing,

would water get to the circulating pump and the rest of the engine, even without the impeller?

Yes, the inpeller is there to create suction to pull water from the lake into the system & then pump it towards the engine. When your using a hose, your already creating water pressure into the cooling system.

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