oil coming out of dipstick at high rpms??

[jtybt]

Re: oil coming out of dipstick at high rpms??

Whassa finger loop tube?

 

[Don S]

Re: oil coming out of dipstick at high rpms??

Whassa finger loop tube?

It's that loop in the top of the dip stick you stick your finger in to pull the dipstick out.
Newer models have a yellow ball at the top, not the ring.

 

[Bondo]

Re: oil coming out of dipstick at high rpms??

Quote:
Originally Posted by jtybt
Whassa finger loop tube?
-------------------------------------------------------------------------------------
It's that loop in the top of the dip stick you stick your finger in to pull the dipstick out.
Newer models have a yellow ball at the top, not the ring.

Ayuh,.... But ain't that a Finger Loop Dipstick,..??

The topic is the Finger Loop Tube.......

 

[a70eliminator]

Re: oil coming out of dipstick at high rpms??

Make sure you or someone hasn't replaced the crankcase ventilation hose with plain rubber non vacuum rated stuff because it will collapse under vacuum when it gets warm and cause high crankcase pressure, it's a longshot but I thought worth a mention.

 

[peanutbay1]

Re: oil coming out of dipstick at high rpms??

I love Iboats!!!! I am not much of a computer/forum guy so I apologize if I mixed things up. Bottom line is I really appreciate everyones help. I am not a first time boater but everyday I learn something new. Now I have just a few more questions.

1) Is there any other source of crank case ventilation besides the 2 hoses that come out of the valve covers??
2) Since my dipstick is open to atmosphere should I purchase a new one that is sealed??

The dipstick is definatly not sealed so maybe something is broke off. Also is there a correct direction the hoop should face when inserted in the dipstick tube?? On my snowmobile if you put the gear case dipstick in 180 deg. off position it will leak so thats why I ask. Thanks again guys...You rock!!!!!

 

[Paul Ryan]

Re: oil coming out of dipstick at high rpms??

Most engine dipsticks I have seen have a o-ring to seal it. Is there a grove right below the "finger loop cover" that could hold a o-ring?

 

[EddiePetty]

Re: oil coming out of dipstick at high rpms??

I................................

The dipstick is definatly not sealed ............ Also is there a correct direction the hoop should face when inserted in the dipstick tube??

....the dipstick should be sealed at the top of the tube. Depending on your dipstick there should be a o-ring inside the top hat, an o-ring on the male insert of the handle or some form of gasket towards the top. In my experience with newer engines, the vent tubes from the valve covers are probably the sole source of crankcase venting.
The direction of the dipstick???? Depends !!! Extract the dipstick and note any natural curvature of the blade. Insert the dipstick with this curvature AWAY from the crankshaft. Also, while the dipstick is out, and wiped clean, closely examine it for impact damage towards the bottom end. It may have been contacting the rotating mass, especially during extreme manuvers. Also look closely at the extreme tip....is it shined-up or slightly worn ?? If so, somebody's installed a non-standard dipstick !!!! (This, too, could explain the random ejection of the dipstick)
FWIW....Ed in 'ol Virginny

 

[Fordiesel69]

Re: oil coming out of dipstick at high rpms??

Open your oil FILL cap at 4k rpms just a little bit to observe the blow by. It should be a little simmering effect kind of like a tea kettle just starting to boil. There should be no pulsating, or excess smoke spewing out. If it seems excessive, you have a problem, not limited to all the stuff mentioned above.

There are several routes for crankcase ventilation. Do not limit the problem to the two hoses leading to the spark arrestor. You should pull the valve covers, check for any obstructions in the drainback holes, also inspect the baffles in the valve covers themselvs. In the old days (70's), I saw a wire mesh material that would plug up inside the valve covers.

 

[peanutbay1]

Re: oil coming out of dipstick at high rpms??

I did just that check and it was exactly as you describe. Like a tea kettle simmering. No oil squirting out and no excesive steam. I will investigate all the points of ventalation from the block and see what I find. I may also connect a clear vinyl tube to the dip stick loop and run it to a jar and see just how much she tries to push out. It may even stop if I am slightly overfilled. We will see. Thanks.

 

[jtybt]

Re: oil coming out of dipstick at high rpms??

The dipstick has a tube that extends into the crankcase almost to the bottom of the oil pan. It protects the dipstick from hitting the rotating assembly.

It doesn't matter which way the stick goes in as long as it slides in easily. usually one way is bent or curved to make this happen. You can bend it to the way you like. To be consistent, have the fill marks on the dipstick always facing up as you remove it.

The valve covers should be the only vents to the engine. Older motors had an oil fill and vent cap on the intake manifold. That allowed condensation to build up in the valve covers. Modification were made to vent the valve covers so condensation wouldn't build up. This later became an industry standard and later became the PVC device connected to the base of the carb to suck out and re-burn blow-by and condensation.

 

[KJSmitty]

Re: oil coming out of dipstick at high rpms??

Definitely shift your focus from the dipstick/tube back to the valve cover vent hoses and/or PCV system....

Even if the wrong dipstick and/or a missing o-ring (as others have mentioned), oil should not be being forced up the dipstick tube - regardless of rpm. The only thing that will cause this is excessive crankcase pressure.

As others have mentioned, check to see that the hoses coming from the valve covers are not clogged - you may have to pull each valve cover to ensure the baffles inside are also not clogged etc.

You may only have one hose from one valve cover venting into the flame arrestor. You may have a hose coming off of each valve cover, at least one (or both) will vent to the flame arrestor. If one of the hoses/valve covers has a PCV valve, that hose should be attached to a manifold vacuum source - as in not "ported vacuum." This should either be from the top of manifold or at the base of the carburetor. If you do have a PCV valve and it's installed correctly, ensure that the valve is good. Sitting for three years I would bet the valve is rusted/clogged/stuck closed.

Then again, if you find a PCV valve with the hose venting to the flame arrestor, someone has either installed a PCV valve inappropriately, or inappropriately vented an existing PCV valve to the flame arrestor vise a vacuum source etc..

Bottom line, if the engine is sound, you have a simple crankcase ventilation issue. If you really want to verify the pressure, perform the same test as above yet when the oil starts coming out of your dipstick tube, then pull the fill cap and I could near guarantee the oil would no longer come out with the cap removed...

Cheers

 

[peanutbay1]

Re: oil coming out of dipstick at high rpms??

I will check all these items out directly. As always thanks to everyone on this site who helps out. I look at these problems as pathways to gaining mechanical knowledge and your help is a big part of that process. Thanks again!!!!!