Larry Jaques wrote:

On Mon, 30 Jun 2014 21:46:44 -0500, "Pete C."
wrote:


Larry Jaques wrote:

On Mon, 30 Jun 2014 08:15:48 -0500, "Pete C."
wrote:

I've seen exactly this on an auto transmission - proper line pressure at
startup, but as soon as you rev it a bit, it sucked the crud to the
screen and lost pressure.

That never happens unless you've fried your clutches or bands. A/Ts
stay damned clean until they start falling apart. That usually
happens very quickly and they need to be completely overhauled.

It happens when the trans cooler heat exchanger has a blow out and mixes
coolant in with your ATF. It seems the paint on the trans pan doesn't
like coolant and looses it's bond to the metal. Looks normal when you
drop the pan, but when the fluid starts flowing the whole sheet of paint
lifts up and lands on the inlet screen.

Huh? Since when have they painted tranny pans?!?

Audi did in the early '90s timeframe.

On Tue, 01 Jul 2014 08:16:02 -0500, "Pete C."
wrote:


Larry Jaques wrote:

On Mon, 30 Jun 2014 21:46:44 -0500, "Pete C."
wrote:


Larry Jaques wrote:

On Mon, 30 Jun 2014 08:15:48 -0500, "Pete C."
wrote:

I've seen exactly this on an auto transmission - proper line pressure at
startup, but as soon as you rev it a bit, it sucked the crud to the
screen and lost pressure.

That never happens unless you've fried your clutches or bands. A/Ts
stay damned clean until they start falling apart. That usually
happens very quickly and they need to be completely overhauled.

It happens when the trans cooler heat exchanger has a blow out and mixes
coolant in with your ATF. It seems the paint on the trans pan doesn't
like coolant and looses it's bond to the metal. Looks normal when you
drop the pan, but when the fluid starts flowing the whole sheet of paint
lifts up and lands on the inlet screen.

Huh? Since when have they painted tranny pans?!?

Audi did in the early '90s timeframe.

How long did it take them to learn their lesson?

--
You can ignore reality, but you cannot ignore
the consequences of ignoring reality.
--Ayn Rand

Larry Jaques wrote:

On Tue, 01 Jul 2014 08:16:02 -0500, "Pete C."
wrote:


Larry Jaques wrote:

On Mon, 30 Jun 2014 21:46:44 -0500, "Pete C."
wrote:


Larry Jaques wrote:

On Mon, 30 Jun 2014 08:15:48 -0500, "Pete C."
wrote:

I've seen exactly this on an auto transmission - proper line pressure at
startup, but as soon as you rev it a bit, it sucked the crud to the
screen and lost pressure.

That never happens unless you've fried your clutches or bands. A/Ts
stay damned clean until they start falling apart. That usually
happens very quickly and they need to be completely overhauled.

It happens when the trans cooler heat exchanger has a blow out and mixes
coolant in with your ATF. It seems the paint on the trans pan doesn't
like coolant and looses it's bond to the metal. Looks normal when you
drop the pan, but when the fluid starts flowing the whole sheet of paint
lifts up and lands on the inlet screen.

Huh? Since when have they painted tranny pans?!?

Audi did in the early '90s timeframe.

How long did it take them to learn their lesson?

No idea, we just removed the failed paint and slapped it back together.