an overfill on the dipstick after changing oil and filter. I add the
exact amount specified in the manual and it always looks overfilled.
I've noticed the same thing on several cars I've owned and never had a
| > Are you sure you had an extra quart in the crankcase? I typically
| > an overfill on the dipstick after changing oil and filter. I add
| > exact amount specified in the manual and it always looks overfilled.
| > I've noticed the same thing on several cars I've owned and never had
| > problem.
| Does it still check over-full after running it long enough to fill
| the filter?
| Take care.
Good question Ken . Yes it does. I always start the engine and run it
for a few minutes at idle just to make sure there are no leaks. Then I
check the old level and it usually reads high by at least a half quart,
maybe more. I don't even wait for oil to drain back into the crankcase,
I just check the level to make sure it's okay and I didn't do something
stupid. I like to see the nice clean oil on the dip stick. :-)
| > Good question Ken . Yes it does. I always start the engine and run
| > for a few minutes at idle just to make sure there are no leaks.
| > check the old level and it usually reads high by at least a half
| > maybe more. I don't even wait for oil to drain back into the
| > just check the level to make sure it's okay and I didn't do
| > stupid. I like to see the nice clean oil on the dip stick. :-)
| OH. That explains a lot!
| The sloshing oil is climbing up the dipstick! Check the oil with the
| engine cold, before you start it. Then you'll get an accurate reading
| what is in the crankcase!
I really don't think there is any "sloshing oil" after the engine has
stopped. Waiting a few minutes might give a more accurate reading, but
waiting until the engine is cold is unnecessary.
On Sun, 14 Jan 2007 10:53:34 -0800, cavedweller wrote:
I dunno...I drive Toyotas, mostly. AFAIK, the bottom of the piston rods
sit in the oil.
I was thinking about this suject today, and I remembered back when I was
in my 20's (um, this was just a *few* years ago... ;)
A girl came up to a friend and I and said her car wouldn't start. She had
an early 70's Mustang, a "Secretary Special", with a 6 cyl. You could here
the solenoid actuating, everything seemed OK, but it just wouldn't crank.
The other guy with me for some unknown reason pulled the dipstick, I guess
to see if there was enough oil and trying to judge if the pistons had
There was oil, alright! All the way up the spout! He asked her how so much
oil got in the engine, and she said, "I dunno...I just have them put a
quart in every time I get gas"...!
She thought cars burned oil as well as gas, and thought you had to add oil
every time you added gas. We went back to my car and got my wrenches, and
drained a quart...then another...then another...about 5 quarts. When it
finally got to the FULL mark on the dipstick, we had her try it and the
car started right up.
Likely not when the engine is running and the pump is feeding oil to
the lube system. (or when the crankcase is overfull) In operation,
"oiling" for the rod bearings is accomplished by pressure feed.via the
cross drilled holes in the crankshaft journals.
Now that's a good one. I can just see the head of oil all the way back
up to the top end!! So now we come back to visualizing a crankcase
SO full that on cranking the pistons have nowhere to go on the BOTTOM
and generate a hydrostatic lock. Hilarious!!
On Sat, 06 Jan 2007 07:52:20 -0800, cheerful wrote:
Was that all? An extra quart? I thought it was more than that!
I fill my Toyotas (and my GR Vger when I had it) with the proper amount of
oil, less one-half quart; then I put in a quart of Marvel Mystery Oil. No
probs, until I did this on the Honda (same one with the blown engine...I
started doing my own oil changes after that!) and the car wouldn't start!
1/2 Quart over? Maybe it has something to do with the way Hondas move oil...?
I suspect if you put enough oil in most engines and rev. them high
enough some seal or gasket will let loose from dynamic localized
pressure (I just snuck the word gasket in there). :)
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')
Seems to me that if you filled an engine right up to the top and started
it up there would be some increase of pressure. I have never actually
tried filling an engine until it was full, but I would be extremely
surprised if all the oil stayed contained inside the engine when it was
But that is not what he said happened. He said he got a new engine and
that the service rep explained that Hydraulic Lock was the cause of the
engine failure. This sounds believable (why would they lie). What he
probably got confused about is what valve was involved. It probably
wasn't the engine valves but the PCV valve that caused the failure. I
can imagine, under the circumstances described, a geyser of oil being
sucked into the engine thru the PCV valve.
There is nothing accurate in this post... The oil pump is sucking oil
out of the oil pan which is essentially a bucket. The oil pump has no
idea if there is 1 quart of oil in that bucket or 300 gallons of oil
in that bucket. The problem with overfilling is that the spinning
crankshaft comes in contact with the oil. The whipping action of the
crankshaft will aerate the oil and turn it in to a foamy froth. The
oil pump can not pump this froth so you loose oil pressure and soon
after loose an engine if you don't stop.
Valve seals are not exposed to pressurized oil. Any lubrication needs
they have are handled by oil splashing off the other valve train
Oh wow that's quite the story. Liquids can't be compressed eh? Well damn,
that's just re-writing the laws of physics right there. I guess oil doesn't
burn in the combustion chamber either. You learn something new every day.
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