To flush or not to flush........ - PeachParts Mercedes-Benz Forum

netboy · #1 04-02-2011, 08:49 PM

Recently purchased an 83 300D with a bad tranny. Checked the pan for metal, checked modulator press and vacuum. 3rd gear flairs to the point its gone. After a few test drives, I dropped the again pan to change the valve body and found the pan full of metal flakes and chunks. I have another tranny from an 81 300SD but I could not obtain the torque converter because the engine was locked up.
I have read on the forum that it is bad to flush a transmission system due to inducing problems. Has anyone successfully flushed a transmission cooler, lines, and torque converter without trashing the next tranny? Can you flush a torque converter and reuse it?

layback40 · #2 04-02-2011, 08:59 PM

Quote:

Originally Posted by netboy

Recently purchased an 83 300D with a bad tranny. Checked the pan for metal, checked modulator press and vacuum. 3rd gear flairs to the point its gone. After a few test drives, I dropped the again pan to change the valve body and found the pan full of metal flakes and chunks. I have another tranny from an 81 300SD but I could not obtain the torque converter because the engine was locked up.
I have read on the forum that it is bad to flush a transmission system due to inducing problems. Has anyone successfully flushed a transmission cooler, lines, and torque converter without trashing the next tranny? Can you flush a torque converter and reuse it?

You definitely should flush the TC & cooler & hope that they are good.
You may (should) replace the front seal on the trans as the TC may not lign up on the seal the same.

leathermang · #3 04-02-2011, 09:00 PM

Quote:

Originally Posted by netboy

I have read on the forum that it is bad to flush a transmission system due to inducing problems. Has anyone successfully flushed a transmission cooler, lines, and torque converter without trashing the next tranny? Can you flush a torque converter and reuse it?

That is an old wives tale and we have thoroughly debunked that Magic fluid inside it theory...

If you can do a good flush you should be able to use it...

JHZR2 · #4 04-02-2011, 11:36 PM

Quote:

Originally Posted by leathermang

That is an old wives tale and we have thoroughly debunked that Magic fluid inside it theory...

If you can do a good flush you should be able to use it...

Agree. Nothing bad about doing a flush. All good. The bad is having a mimimum wage monkey without a clue doing stuff to sell products and not what is technically sound.

I would definitely flush my radiator cooler, lines and the TC thuroughly. Id buy a few gallons of ATF and an electric pump to flush everything. No big deal...

Id also buy a magnefine or equivalent and put it inline to protect further...

leathermang · #5 04-02-2011, 11:49 PM

LOL, minimum wage monkeys are bad for EveryThing. For the effort you must expend to watch them ( for your stuff's protection ) you can do it yourself with much more pleasure and security....

DieselPaul · #6 04-02-2011, 11:51 PM

Its sad, I saw this thread title on the homepage and thought it was about wheels. Ugh, a sign of the times.

whunter · #7 04-03-2011, 12:23 AM

Quote:

Originally Posted by netboy

Recently purchased an 83 300D with a bad tranny.
Checked the pan for metal, checked modulator press and vacuum.
3rd gear flairs to the point its gone.
After a few test drives, I dropped the again pan to change the valve body and found the pan full of metal flakes and chunks.
I have another tranny from an 81 300SD but I could not obtain the torque converter because the engine was locked up.

The 300SD has an electronic speedometer..

.

netboy · #8 04-04-2011, 09:44 PM

yeah, I knew the speedos were different, but I can swap the backends of the tranny for a mechanical speedo drive from the original, right?
what is a magnefine,who sells them and where does it go, in the pan?

vstech · #9 04-04-2011, 10:46 PM

A magnefine (basically a magnet in the drain plug, or stuck to the bottom of the pan) won't do much, as most of the metal in the transmission is aluminum. the clutch wear plates are of course steel, as is the TC...

leathermang · #10 04-05-2011, 01:38 PM

Quote:

Originally Posted by vstech

A magnefine (basically a magnet in the drain plug, or stuck to the bottom of the pan) won't do much, as most of the metal in the transmission is aluminum. the clutch wear plates are of course steel, as is the TC...

This gave me an idea concerning the thread about the guy with the #12 vacuum pump bearing possibly wandering around the bottom of the engine oil pan and rubbing against the oil pump pickup screen... finally wearing through and trashing the oil pump and the engine if not turned off quick enough after that collision..
A big magnet... if positioned correctly under the oil pickup screen might keep that ( hopefully and assumed magnetically attracted ) bearing against the bottom of the pan and not let it penetrate the oil pickup screen (?).
We need someone with their pan off to post the dimensions needed to accurately position that magnet on the bottom of the pan. Perhaps even without having a vacuum pump give way on that type engine.... just in case...
But I can not find that thread again... LOL... John , can you help ?

JHZR2 · #11 04-05-2011, 02:16 PM

Quote:

Originally Posted by vstech

A magnefine (basically a magnet in the drain plug, or stuck to the bottom of the pan) won't do much, as most of the metal in the transmission is aluminum. the clutch wear plates are of course steel, as is the TC...

Magnefine is a brand of inline filters, not just a magnet in the sump.

netboy · #12 04-05-2011, 06:34 PM

That sounds like a good idea, considering the alternative. I assume its slaved in just prior to the cooler. On a 722.3 which side line is the supply and which is return to the tranny?
Is there any trick to swapping the aft end of the trannies...?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode