"Flushed" my transmission at home - a question

[ConfederateTyrant]

5/16" is 1-8515
3/8" is 1-8514

You can verify that on NAPA's website for part searches, but those are the numbers I used.

 

[daman]

Originally Posted By: ConfederateTyrant
5/16" is 1-8515
3/8" is 1-8514

You can verify that on NAPA's website for part searches, but those are the numbers I used.

Great thanks ConfederateTyrant...

 

[ConfederateTyrant]

Quote:
My local Napa store (upstate NY) was just under $20 I think, not sure how much shipping would be from Magnefine but thought it was close enough.

I wish my local NAPA's were that cheap, I'd get them from there instead. If I get 3 from Magnefine it's $45 + ~6.20 for shipping, which is a lot cheaper than getting 3 from the local NAPAs.

 

[daman]

I see on magnefine's site they list a "Smart Connects" for
like $3 extra bucks,,whats that about???

 

[Donald]

Originally Posted By: ConfederateTyrant
5/16" is 1-8515
3/8" is 1-8514

You can verify that on NAPA's website for part searches, but those are the numbers I used.


I think you mean 7/16 rather than 5/16.

 

[Donald]

Originally Posted By: daman
I see on magnefine's site they list a "Smart Connects" for
like $3 extra bucks,,whats that about???


I believe they allow you to splice into metal tubing rather than rubber.

If you go to the Magnefine website and look at the installation instructions you will see them there.

 

[ConfederateTyrant]

Quote:
I think you mean 7/16 rather than 5/16.

According to the filter I have sitting right next to me, along with the part number and Magnefine's website, it's 5/16".

 

[Gary Allan]

Originally Posted By: bamorris2
Originally Posted By: unDummy
If a tranny has a parallel thermostat somewhere in the ATF flow loop, it would be possible to have ATF exit 'both' cooler lines when warm. I'll have to take a look at the r75 fluid flow the next time I see the service manual.

Most trannies only need '1' cooler line removed for a flush. Simply knowing the flow direction is all that is needed.


Maybe you're onto something here... About half way between the cooler and the transmission, there is what I think is a bypass. Maybe it's a parallel bypass..??..

It looks somewhat similiar to the item HERE, but is about twice the size, and is silver aluminum.


That works. With the cooler lines attached the flow would just go idle without any pressure differential. Without the deadhead, it would flow from both. Undummy called it right. If you hadn't identified a thermostat, I was going to suggest some internal wax bulb type diverter that merely bridged the inut ports. That would do the same thing.

When you said "each" instead of "both" (put in a jug) and "jugs" instead of "jug" ..it kinda indicated that this wasn't some imagined thing.

 

[Fester]

Originally Posted By: Gary Allan
Originally Posted By: bamorris2
Originally Posted By: unDummy
If a tranny has a parallel thermostat somewhere in the ATF flow loop, it would be possible to have ATF exit 'both' cooler lines when warm. I'll have to take a look at the r75 fluid flow the next time I see the service manual.

Most trannies only need '1' cooler line removed for a flush. Simply knowing the flow direction is all that is needed.
Maybe you're onto something here... About half way between the cooler and the transmission, there is what I think is a bypass. Maybe it's a parallel bypass..??..

It looks somewhat similiar to the item HERE, but is about twice the size, and is silver aluminum.


That works. With the cooler lines attached the flow would just go idle without any pressure differential. Without the deadhead, it would flow from both. Undummy called it right. If you hadn't identified a thermostat, I was going to suggest some internal wax bulb type diverter that merely bridged the inut ports. That would do the same thing.

When you said "each" instead of "both" (put in a jug) and "jugs" instead of "jug" ..it kinda indicated that this wasn't some imagined thing.

So does this mean that some old fluid is going back into the sump pan, since its coming out of both lines, sure surely must be going back into the pan, I would think? maybe clamp it off with a c clamp to insure flow in one direction or just remove the bypass valve temporally.

 

[unDummy]

Old fluid is ALWAYS going back to the sump from multiple areas. This is one reason why those fancy machine flushes are usually 80-90% effective. NO MATTER HOW THEY ARE ADVERTISED, they are not complete. Tech competence and attention to detail will get you into the 90's %. Tech incompetence with a flush machine might yield a 70% flush and is pretty common with those relatively cheap discount ATF flushes.

The cooler loop is a majority fluid flow source. It is not 'total' fluid flow. Just an easy source to remove fluid.

Bypassing thermostats is a known mod with the r100 sized trannies since it can be a cause of failure. Not even sure if it was a real thermostat. Some tranny cooler loops use a 'bypass' like on an oil filter. Thick cold fluid simply creates the pressure differential to push back the ball and spring and go into bypass. Yep, something simple as a VB mod or shift kit can toast those transmissions. Increase the line pressure and cooler loop is in full bypass by the increase of ATF psi and flow. A real temp thermostat, which costs a little more then a ball and spring valve, would be better. Again, I haven't had my hands on the r75.

Another method for fluid to flow out of both cooler lines if the higher flow higher PSI feeds another ATF flow loop that might be at a lower pressure flow. Kill the higher flow by disconnecting the line and there is nothing to keep the low flow in check meaning it exits out in reverse.

When doing a flush, starting with a pan drop first, along with using more then the tranny's full capacity, is plenty enough. I wouldn't worry about a little of the old fluid going back into the pan. It happens.