TRNW-2: 6t70 case condition

[Chris and Cathy Kershaw]

I did a little experimenting earlier with a couple of old parts. Left is a
10r trashcan after 5 minutes in the parts washer, right is fresh out of the
scrap barrel.

We use pdn50 soap from better engineering, the company that made our
machine. I skim/vac oil of the water, add soap and clean dirt/trash out
every week or two. It’s been a while since I pumped it dry for big clean
out. I’m going to do that hopefully in the next week. I’ll repeat this
experiment after that.

I don’t believe our parts washer damaged the 6t70 case, but I am curious
now. The stains on the 6t70 case really look like it was soaked in
something. Scotch brite won’t take it off in the piston bore.

On Tue, Jan 21, 2025 at 12:51 PM Fred Whitaker via trnw2 <trnw2 at trnw.net>
wrote:

>  Yea,I had that problem years ago. I ruined more than one 440 case
> screwing up the accumulator bores., I was using Zep soap.
>  But it can still happen without Zep soap if you let the parts washer go
> way to long.
>
>
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
> jbockus--- via trnw2 <trnw2 at trnw.net>
> *Sent:* Tuesday, January 21, 2025 10:35 AM
> *To:* Chris Kershaw <kershawservicesllc at gmail.com>; Technical Discussion
> Forum <trnw2 at trnw.net>
> *Subject:* Re: TRNW-2: 6t70 case condition
>
> I've personally never had that issue in my shop but have built a few
> units that have been rebuilt that had the gray tint to the aluminum and
> it's caused from the parts washer water not being maintained properly.
> It plays havoc on molded rubber pistons! I too use the Zep soap in my
> washer and have never had problems with it, but we clean our machine
> regularly too.
>
> On 2025-01-21 10:29 am, Chris Kershaw via trnw2 wrote:
> > Post ID: 21288 [1]
> > Date: Tue Jan 21 8:29:13 PST 2025
> > Subject: 6T70, 6t70 case condition
> > We have a 6t70 here that was originally built by another shop,
> > essentially with no warranty. Customer brought it here, we corrected
> > several build issues and did all the usual work. Trans worked good and
> > it left. It's now back for the second time with p0756 & a loose molded
> > piston in the case. We decided to get another case after reading the
> > fixes in the data base. Now I'm wondering what ruined the case. They
> > don't look like this coming out of our cleaning machine. Top is the
> > bad/old, bottom is the new/used. The customer owns tractor trailers,
> > he said looks like polished aluminum on a big truck that was sprayed
> > with purple power or zep.
> >
> > Chris Kershaw
> > Kershaw Services Llc The Gear Box
> > Mechanicsville, Maryland USA
> > kershawservicesllc at gmail.com
> >
> > -------------------------
> >
> > To Read The Entire Thread, Click The Link Below
> >
> > Read Entire Thread [1]
> >
> >
> >
> > Links:
> > ------
> > [1] https://www.trnw.net/trnw/forum_thread.php?post_id=21288&forum=2
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