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Running engine on hose pipe

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grodob

Member
Can you advise me if it is OK

Can you advise me if it is OK to run my AQ250 by the following method...
The sea water pump is removed.
If I run my hose pipe straight into the outgoing pipe from the sea water pump will it be Ok to run the engine like this for testing
Thanks for any advice...
 
"Gordon, The amount of water b

"Gordon, The amount of water being pumped into the engine water jackets (if a RWC engine) and on to the exhaust is an engineered amount of flow. IOW's...., It is RPM driven and controlled by design. RPM = pump flow!
If you were to do this, and were to introduce too much water into the exhaust, you could create a problem for yourself... worse yet, a problem for an exhaust valve or two.

What is it that you are trying to achieve by doing this?

Now, I will offer this to you....
Each year when I winterize my twin 5.7's, just after warming the engines and doing an oil change....., and just before fogging the engines, I remove my sea water pump impellers (crankshaft mounted pumps) and they go into storge for the winter.
I then do a a quick dry start (up to 6 seconds of 1,200 rpm) for my final fogging and killing of the ignition. This allows my system to blow the exhaust dry.
Point being..... if smart about this, and if you want to just do a very short, low RPM "dry start", it can be done safely.
No dealer or manual is going to state that this can be done.

Again, I'm not certain of what your goal is here. Post back and I'm sure someone will chime in. "
 
"Many thanks for the info Rica

"Many thanks for the info Ricardo.
The reason is I want to just check my engine starts up Ok etc before getting it put in the water. A quick run of 6secs would be Ok. Also I was going to install my new petronix ignition and check that on dry land. However that could wait until I am in the water I suppose. Alternativeley I will have to purchase some muffs I imagine and install the sea water pump, if that is correct?
Thanks"
 
"Just note that this is a [b]q

"Just note that this is a quick run <u>WITH OUT</u> the impeller installed in the pump.

If you really want to test/check your engine, connect the garden hose "muffs" onto the drive.
Plug the drain hole in the lower forward portion of the "Bullet" (the lower gear case).
Start and warm the engine up.

."
 
"Reinstall sea water pump. Put

"Reinstall sea water pump. Put short length of hose on inlet of the pump. Put other end of hose into a 5 gal pail. Put garden hose into pail, fill pail. Start engine. Keep hose running. If engine sucks pail water lever low, either reduce RPMs immediately or shut off engine immediately.
Pump impellers do not like to run dry."
 
"Robert, The AQ 250 OHC engine

"Robert, The AQ 250 OHC engine's sea water pump is fitted with the copper suction/supply tubes and S shaped clamp. Sort of difficult to do right at the pump.... better off if you made this connection at the rear of the engine.

So Gordon, I have a question; why would one not simply connect the muffs to the drive and plug the drain hole?
This lets you check a few other connections as well. Am I missing something here?"
 
"Many thanks, yes you are righ

"Many thanks, yes you are right I need to get some muffs.
I just thought it was a short cut to connect the hose as I originally suggested, but not a good idea, good job I checked with the experts. Much appreciated
What is the best method of plugging the drain hole please. As you can tell I am new to this!"
 
"Honestly, I use a piece of wo

"Honestly, I use a piece of wood of the correct diameter that has been whittled to a point. I just push it into the drain hole.

Gordon, it would be very helpful for you to pick up a Volvo Penta OEM manual for your engine and drive. (not Seloc/not Clymers)
It will offer much of this information along with a few photos that will additionally help you with your questions.
Don't get me wrong... the forum is great for this as well.
happy.gif
"
 
"Right, that sounds easy, than

"Right, that sounds easy, thanks
Yes I will get a manual, sounds a sensible idea.
Many thanks for your help"
 
"Try a small trash can...... l

"Try a small trash can...... lower the outdrive into it, fill it with water, keep the hose on, and run the engine all day. I have found that you can create leaks by disconnecting the pipes at the impeller. Thus the need for new rubber seals!
Long story short, keep the engine and outdrive intact......and make a body of water for your lower unit."
 
Thanks Eric
Another good meth

Thanks Eric
Another good method. Same as when I run my outboard at home.
I assume I need to make sure the trash can is deep enough to get the water level the same as the sea water pump
 
"Quote: [b]"I assume I nee

"Quote: "I assume I need to make sure the trash can is deep enough to get the water level the same as the sea water pump".
Gordon, you're going to need a pretty darn deep container...... the raw water pump is engine mounted for this drive system!

Look, you've got the perfect connection point for connecting the garden hose muffs to the drive for this.
Why re-invent the wheel?
Just make sure that you purchase the correct muffs for your drive! "
 
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