differential without oil?

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Old 11 Mar 2006, 10:17 pm   #1 (permalink)
mrdarrett@gmail.com
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Default differential without oil?

What would happen if one were to drain the differential, then "forget"
to refill the diff with ATF?

How many miles would you have to drive before damaging the car?

What would the damage look like?

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Old 12 Mar 2006, 12:57 am   #2 (permalink)
Maim Menu
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Default Re: differential without oil?

So what did you do exactly?

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Old 12 Mar 2006, 01:19 am   #3 (permalink)
onehappymadman@yahoo.com
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Default Re: differential without oil?


Maim Menu wrote:
> So what did you do exactly?


(cheesy grin)

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Old 12 Mar 2006, 05:55 am   #4 (permalink)
m Ransley
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Default Re: differential without oil?

How many miles did you or your customer drive it

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Old 12 Mar 2006, 06:31 am   #5 (permalink)
justinm930
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Default Re: differential without oil?

diffs are just like anything else. They need lubrication to cool, clean,
and protect the gears inside.

If it were a transaxle, there would most likely be noise, slipping, and a
burning smell coming from the car.

If its a diff only, like a rear diff on a 4X4, you would most likely
notice a clunking sound coming from the diff and the burnt smell as well.

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Old 12 Mar 2006, 08:12 am   #6 (permalink)
Daniel
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Default Re: differential without oil?

Someone reported something like this not long ago.
Somehow there was an internal leak between the differential and the
transmission such that the differential ran low on oil.
Took a couple thousand miles before requiring expensive replacement of
the differntial (gears?)
The load on those gears is less than in rear wheel drive, but run dry
they will exhibit typical wear patterns.
You'll wind up with overheated metal and instead of properly formed
gears little piles of metal will start to grow in the bottom of the
case.
I imagine if you ran it completely dry, this would occur sooner.
It is possilbe, you would notice some noise if you were listening for
it, prior to outright failure.

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Old 12 Mar 2006, 05:24 pm   #7 (permalink)
Jason James
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Default Re: differential without oil?


<mrdarrett@gmail.com> wrote in message
news:1142137054.013226.202780@e56g2000cwe.googlegr oups.com...
> What would happen if one were to drain the differential, then "forget"
> to refill the diff with ATF?
>
> How many miles would you have to drive before damaging the car?
>
> What would the damage look like?


A diff without oil,..will fail in a matter of a few miles. The damage will
be proportional to the length of the drive. If you stop when you start
hearing noises from the diff,..it *may* still function if refilled, but it
will be noisy. Eventually the diff simply siezes causing the car to stop, if
you just keep driving.

The ball-bearings will survive relatively well in those few miles.

Gear teeth rely on a film of oil to stop metal on metal contact. Without
oil, the friction will be great and heat will be generated to the extent the
teeth start to shed their surfaces. This metal then collects around the
teeth causing an eventual lock-up, or the teeth get so thin they snap off.
Its not a pretty picture by any means.

Jason


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Old 14 Mar 2006, 11:55 am   #8 (permalink)
Orv
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Default Re: differential without oil?

<mrdarrett@gmail.com> wrote in message
news:1142137054.013226.202780@e56g2000cwe.googlegr oups.com...
> What would happen if one were to drain the differential, then "forget"
> to refill the diff with ATF?
>
> How many miles would you have to drive before damaging the car?
>
> What would the damage look like?
>


54 miles until the differential froze up on the freeway after an automatic
transmission overhaul where the repair shop forgot to refill the
differential on a mid 80s Camry. Heard no noise up to that point. The
newer ones may be different.


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Old 14 Mar 2006, 11:30 pm   #9 (permalink)
Jason James
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Default Re: differential without oil?


"Orv" <Orv@Cox.Net> wrote in message
news:8rDRf.42856$V27.13818@fed1read06...
> <mrdarrett@gmail.com> wrote in message
> news:1142137054.013226.202780@e56g2000cwe.googlegr oups.com...
> > What would happen if one were to drain the differential, then "forget"
> > to refill the diff with ATF?
> >
> > How many miles would you have to drive before damaging the car?
> >
> > What would the damage look like?
> >

>
> 54 miles until the differential froze up on the freeway after an automatic
> transmission overhaul where the repair shop forgot to refill the
> differential on a mid 80s Camry. Heard no noise up to that point. The
> newer ones may be different.


I know of one accasion where a rear-drive car which admittedly has hypoid
gears which have a sliding contact, blew the diff in a few miles. So you are
probably right. Straight drive gears will last longer.

Jason


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Old 15 Mar 2006, 09:02 pm   #10 (permalink)
The Jones'
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Default Re: differential without oil?

We were given a 1989 Camry with AT as a gift from a relative for our
teenage son about 2 years ago. We picked it up in LA and drove it home
to northern California with no problems. My standard procedure when
aquiring a new (used) vehicle is to change all of the fluids. Upon
draining the diff, less than a cup of ATF came out! The capacity is
about 2 Qts. I have no idea how long it had been driven this way, but
it has been going fine for us with no noise or other probs. Impressive
idiotproof toyota engineering.
On 11 Mar 2006 20:17:34 -0800, mrdarrett@gmail.com wrote:

>What would happen if one were to drain the differential, then "forget"
>to refill the diff with ATF?
>
>How many miles would you have to drive before damaging the car?
>
>What would the damage look like?
>


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