"Discussion" in another group

I say, overfilling with oil can cause Hydraulic Lock in an engine, others
there are telling me no way.

"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:9Ptnh.2$1h.0@trndny09...[color=blue]
>I say, overfilling with oil can cause Hydraulic Lock in an engine, others
> there are telling me no way.[/color]

It would have to be overfilled by a lot, but yes, overfilling can cause
hydraulic lock. To cause hydraulic lock, the pan would have to be filled
enough to submerge the crankshaft and fill the air space under the pistons.
--

Ray O
(correct punctuation to reply)

Hachiroku ãƒ?ãƒ?ãƒ*ク wrote:[color=blue]
> I say, overfilling with oil can cause Hydraulic Lock in an engine, others
> there are telling me no way.[/color]
How much oil? If you are meaning "hydraulic lock" not allowing piston /
crankshaft / internal component movement by overfilling a bit, I don't
think so. If you mean filling the entire crankcase, maybe. If you fill
each individual cylinder with oil, yes. Overfilling your crankcase oil
can result in a loss of fuel mileage, interruption of normal design oil
flow causing lack of lubrication, foaming, excessive emissions, and
probably a few more that Ray O can elaborate on. It is usually highly
recommended that the crankcase oil fill level does not come into contact
with the crankshaft unlike an air cooled motor that has a splash lube
system that normally uses a "paddle" bolted on the bottom of the rod
bearing.

On Fri, 05 Jan 2007 10:35:17 -0600, Ray O wrote:
[color=blue]
>
> "Hachiroku ????" <Trueno@AE86.gts> wrote in message
> news:9Ptnh.2$1h.0@trndny09...[color=green]
>>I say, overfilling with oil can cause Hydraulic Lock in an engine, others
>> there are telling me no way.[/color]
>
> It would have to be overfilled by a lot, but yes, overfilling can cause
> hydraulic lock. To cause hydraulic lock, the pan would have to be filled
> enough to submerge the crankshaft and fill the air space under the
> pistons.[/color]


3 quarts over in a 4 quart system...

"Hachiroku ????" <Trueno@AE86.gts> wrote in message news:9Ptnh.2$1h.0@trndny09...[color=blue]
>I say, overfilling with oil can cause Hydraulic Lock in an engine, others
> there are telling me no way.[/color]

Econo lube replaced my cousin /roommates engine after they filled it twice doing a oil change.
It blew a big hole in the block before she got it into 2nd gear.

Hachiroku ãƒ?ãƒ?ãƒ*ク wrote:[color=blue]
> I say, overfilling with oil can cause Hydraulic Lock in an engine, others
> there are telling me no way.[/color]


Lets see. Hydraulic lock would only occur if the movement of the
pistons were prevented by the lack of a compressible substance... Oil.
You would pretty much have to get every drop of air out of the system.
Even in the event that you did, usually one piston is moving up while
the other is moving down. It would seem to me that this would relieve
any pressure build up from other pistons going down. I would vote no.
But I'm not a physicist... yet. :)