Accidental hose turned on before running engine

[larrybr45]

Just curious, before I put my 96 sportster in the water, I hooked up hose, ran, and then turned off engine. THen ran boat fine for a couple hours.

In reading some posts it appears I was supposed to start engine first, then turn on water, then turn off water and then shutoff engine.

Might I have caused serious damage? The boat did run fine after I did this.

thanks

 

[bigJake]

Just curious, before I put my 96 sportster in the water, I hooked up hose, ran, and then turned off engine. THen ran boat fine for a couple hours.

In reading some posts it appears I was supposed to start engine first, then turn on water, then turn off water and then shutoff engine.

Might I have caused serious damage? The boat did run fine after I did this.

thanks

if you are saying you ran the boat in the lake for a couple hours after doing this you are fine.

 

[DonoBBD]

Just curious, before I put my 96 sportster in the water, I hooked up hose, ran, and then turned off engine. THen ran boat fine for a couple hours.

In reading some posts it appears I was supposed to start engine first, then turn on water, then turn off water and then shutoff engine.

Might I have caused serious damage? The boat did run fine after I did this.

thanks

The only reason for this is because the hose water can cool the motor lower then it should and it will start hard. It will not get heat in the plugs and foul the plugs out on you.

Other then that you can't do much damage.

Cheers Don.

 

[crisso]

I heard one day,that it may also fill the inside of the motor with water.Plz.Correct me if I am wrong

 

[bigJake]

I heard one day,that it may also fill the inside of the motor with water.Plz.Correct me if I am wrong

that's the way my engine works Criss

 

[LouDoo]

The problem is you can hydro-lock the engine, however if you ran it in the lake for a couple of hours after you took it off the hose, you're O.K. after two hours if there was any water in the cylinders its gone now.

Lou

 

[crisso]

Thanks my cousins from over there.Glad I got it right.Me is learning good

 

[Sink]

The ski is SHOT! I'll give you $200 for it!!!???? ;-)

 

[larrybr45]

So, if I was able to start it after I ran water in it out of order, should I be ok? Is there a way to check? I just get nervous when people talk about engine locking up etc...

thx

 

[bigJake]

So, if I was able to start it after I ran water in it out of order, should I be ok? Is there a way to check? I just get nervous when people talk about engine locking up etc...

thx

when you turn the hose on before the engine is running, water can enter the cylinders. when that happens you pull the spark plugs and crank the engine to expel the water and get it running asap so it doesn't rust up. Since you already had it running for a couple hours you are fine. No need to do anything. If you did have any moisture in there it is gone now.

 

[SabrToothSqrl]

your engine is fine. the person who said something about "over cooling" is beyond wrong.

The engine's exhaust is water cooled. running pressurized water (hose) into the engine while it's off means there is no exhaust pressure to push the water out of the pipe. the risk is that water could go UP the pipe and INTO the engine. If your engine runs and was run after the hose was off (which you say it was) it's 100% FINE.

 

[LouDoo]

:agree: Sqrl is 100% correct, I usually don't like to criticize someone else's answer but you get a lot more cooling when the ski is in the water than when on the hose, that's one reason it's not a good idea to run the ski on a hose for more than a few minutes.

Your boat is fine, lets move on.

Lou

 

[Sink]

OK... your ski is fine.... but I'd still give you $200 for it! It didn't hydro lock so nothing happened. As long as it started you are fine...

 

[DonoBBD]

your engine is fine. the person who said something about "over cooling" is beyond wrong.

The engine's exhaust is water cooled. running pressurized water (hose) into the engine while it's off means there is no exhaust pressure to push the water out of the pipe. the risk is that water could go UP the pipe and INTO the engine. If your engine runs and was run after the hose was off (which you say it was) it's 100% FINE.

Ok I am quite a 2 stroke head and can clutch a sled to do just about anything. Could you guys enlighten me on how water can enter the cylinder in a jet boat from the exhaust pipe?

How low dose the front of your boat have to be?
How long dose the hose have to run?
Do you need to have some pin holes in your internal part of your pipe?
Is there an internal stinger?
Is there a carbon dam in the pipe to catch carbon that causes the water to flow backwards?

I assumed this is a ski only problem with different routing of the pipe. On my Challenger 800 the exhaust would have to not flow 10 gallons per minute (average garden hose flow). An 800cc motor at 2000 rpm at 2 strokes flows 211 gallons per minute as a pump free flowing no back pressure. An 800cc sled would have a 1.25" stinger diameter. The stinger dia rule should be .6 x the head pipe dia. where it attaches to the cyl. for a sled.

Just thinking out loud from one Snowmobiler to all boaters. I would love to see the inside of one of these pipes if some one can post some pictures of how the water flows through them. Pipe temp is a very good thing for two strokes.

Don.

 

[LouDoo]

I really don't want to get into a debate here but when you are running a ski on a hose you are actually back flushing the ski, water is running in the opposite direction than when under normal operation from the pump. If you disagree with the procedure I would suggest you take it up with BRP.

Also running on the hose was never meant to be used to diagnose engine problems, mainly meant to flush the engine pump, etc. from salt water and contaminants, BRP recommends testing in a tank, or in the water.

We're too far south for snowmobiles but I assume that a snowmobile has a closed cooling system with a radiator and some kind of water pump.

Lou

 

[bigJake]

Ok I am quite a 2 stroke head and can clutch a sled to do just about anything. Could you guys enlighten me on how water can enter the cylinder in a jet boat from the exhaust pipe?

How low dose the front of your boat have to be?
How long dose the hose have to run?
Do you need to have some pin holes in your internal part of your pipe?
Is there an internal stinger?
Is there a carbon dam in the pipe to catch carbon that causes the water to flow backwards?

I assumed this is a ski only problem with different routing of the pipe. On my Challenger 800 the exhaust would have to not flow 10 gallons per minute (average garden hose flow). An 800cc motor at 2000 rpm at 2 strokes flows 211 gallons per minute as a pump free flowing no back pressure. An 800cc sled would have a 1.25" stinger diameter. The stinger dia rule should be .6 x the head pipe dia. where it attaches to the cyl. for a sled.

Just thinking out loud from one Snowmobiler to all boaters. I would love to see the inside of one of these pipes if some one can post some pictures of how the water flows through them. Pipe temp is a very good thing for two strokes.

Don.

Here ya go Don, Enjoy. with no backpressure from the exhaust, water can enter the cylinders

 

[DonoBBD]

I really don't want to get into a debate here but when you are running a ski on a hose you are actually back flushing the ski, water is running in the opposite direction than when under normal operation from the pump. If you disagree with the procedure I would suggest you take it up with BRP.

Also running on the hose was never meant to be used to diagnose engine problems, mainly meant to flush the engine pump, etc. from salt water and contaminants, BRP recommends testing in a tank, or in the water.

We're too far south for snowmobiles but I assume that a snowmobile has a closed cooling system with a radiator and some kind of water pump.

Lou

No debate here just asking why? The diagram that bigjake posted explains it all. It looks like the rav valve on the can controls the water flow to the pipe.

BRP must have spent a ton of time in figuring out the pipe water flow to get the temp of the pipe just right to maximize performance.

I am quite sure you will still have to walk away from the boat with the water running for some time to hydro lock the motor. If you had a crack in the water jacket on the upper part she would fill up fast but you would still have to fill up the can and lower pipe from the small hose leaving the RAV valve to lock up the motor.

IF you don't ask why you don't learn.

Cheers Don.

 

[jhjesse]

Don,
After looking at the diagram above, reverse the flow arrows. That is what happens (by design) when on the hose. This is why running on the hose water flows out the prop/intake grate as opposed to being drawn in, therefore by reversing the water flow without the engine running will fill the cylinders via the exhaust ports.