Interesting question

[Donzi GT250]

Could using a suction type oil extractor on a omc v-8 engine causes issues with the oil system?
The type of oil extractor i am talking about is the one West Marine sells that threads to and seals the top of the dipstick tube and sucks the oil out using vacuum .

 

[Howard Sterndrive]

Re: Interesting question

issues? what sort of issues.

I can't foresee any. Kinda like sucking a drink through a straw.... doesn't cause any issues for the cup

 

[mcleaves]

Re: Interesting question

If it ever did cause an issue the engine would never have lasted while running .

Go for it, it's what many of us use

 

[Donzi GT250]

Re: Interesting question

Issues like affecting the oil pump pressure relief valve.
After all you are applying a vacuum to the oil pan and inside of the oil system of the engine when using the oil extractor.

 

[Idlespeedonly]

Re: Interesting question

There is no vacuum created in the pan. All you are doing is sucking it out the drain plug. You are not sucking it through the oil pump. So it has no effect on that. The only way to create a vacuum in the pan is if you block of the breather tubes.

 

[Donzi GT250]

Re: Interesting question

There is no vacuum created in the pan. All you are doing is sucking it out the drain plug. You are not sucking it through the oil pump. So it has no effect on that. The only way to create a vacuum in the pan is if you block of the breather tubes.

The extractor tube screws onto the oil dipstick tube causing a seal which does cause a vacuum in the oil pan.
Otherwise the oil wouldn't suck out of the oil pan.

 

[byrontony]

Re: Interesting question

I have to agree with Randy on this one, the extractor tube is what has vacuum, or think of it as a tube with lower than atmospheric psi which causes the oil to flow towards (or in) it.

As Randy stated, the only way to acheive vacuum (lower atmospheric psi) in the pan would be to block all the breather ports.

Vacuum, it's not what most people think it is.

 

[JSMoore]

Re: Interesting question

The crankcase is not necessarily a closed system that would allow a vacuum to be formed inside it. The vacuum is just created in the tube until it runs out of oil to suck up. As the oil level lowers inside the oil pan, inside pressures are compensated through the crankcase vents.
Cheers!
JSMoore

 

[Bondo]

Re: Interesting question

issues? what sort of issues.

I can't foresee any. Kinda like sucking a drink through a straw.... doesn't cause any issues for the cup

Ayuh,... Agreed,...

Donzi GT250,... Yer Waayyy over thinkin' a simple operation...

 

[Idlespeedonly]

Re: Interesting question

Vacuum, it's not what most people think it is.

Technically, air pressure in the pan pushes the oil up the tube into the container.

 

[skargo]

Re: Interesting question

In fact, some of us don't have the screw on type tube, we just insert the tube to the bottom of the oilpan, and it sucks it up like a drink through a straw. You won't hurt anything.

 

[bruceb58]

Re: Interesting question

The dipstick tube on an OMC and Volvo connects to the drain plug of the pan therefore you are sucking the oil out of the drain plug hole. There is no vacuum put on the volume of the pan.

 

[byrontony]

Re: Interesting question

Technically, air pressure in the pan pushes the oil up the tube into the container.

Yep.

And this thread just goes to show "ya learn somethin' every day", cause I gotta admit I never new why my dipstick tube had threads on the end.

 

[skargo]

Re: Interesting question

The dipstick tube on an OMC and Volvo connects to the drain plug of the pan therefore you are sucking the oil out of the drain plug hole. There is no vacuum put on the volume of the pan.

Interesting, I had no idea that's how they were set up.

 

[bruceb58]

Re: Interesting question

Interesting, I had no idea that's how they were set up.

Way better than sticking the tube down the dispstick hole. As long as the boat is level, you are assured of getting all of the oil out this way.

 

[Idlespeedonly]

Re: Interesting question

BTW, the threads are garden hose threads.

 

[skargo]

Re: Interesting question

Way better than sticking the tube down the dispstick hole. As long as the boat is level, you are assured of getting all of the oil out this way.

Sounds like a great deal to me, wish my mercruiser was like that.

BTW, the threads are garden hose threads.

So you could run your boat on a hose and change your oil at the same time?

 

[bruceb58]

Re: Interesting question

Sounds like a great deal to me, wish my mercruiser was like that.

You can do something similar and I would consider it if I were you. They have kits that basically replace your drain plug with a fitting with a rubber hose. You can then use a suction pump on that hose to pump out the oil. You also have the option of sticking it out the bilge drain if you have room which I doubt. I believe Mercruiser offered this as standard equipment for a few years.

 

[mcleaves]

Re: Interesting question

The Volvo setup is sweet.. All the oil comes out just like if you pulled the plug (except for what stays in the dipstick tube). And the garden hose threads make it REALLY easy attach to pumping appliances..

Ironically I was reinstalling my engine today and the last thing I had to put on before the lift was the tube plumbed to the bottom of the pan.

 

[Gettinther]

Re: Interesting question

Sounds like a great deal to me, wish my mercruiser was like that.

My mercruiser does have the garden hose fitting