If he works on planes under 135 rules then he has to replace filters and gaskets when they are removed, it's required by the FAA. Grey area, if the filter / gasket was just installed and had to be removed immediately for some reason, maybe not. Only the inspector that signs off on it can decide.

Just like you can't reuse safety wire even if only a few turns are loosened to remove a bolt.

Airplanes are not like cars concerning maintained, even new once used bolts get replaced.

 

I did my triple flush myself. Before I did the first flush I bought a new trans pan and welded a low-profile bung onto it. Dropped the pan, replaced the filter, installed new pan with drain, refilled. Did it two more times just using the drain plug.

 

 

I use the "condom rule". I asked the parts lady if the seal needed to be replaced. Her answer was "Do you reuse condoms?". So whether it is yours or mine, I don't want to reuse it.

 

Question. Considering the triple flush is a "1 off" and we do transmission service every 50k, isn't this a large expense for that kind of service? Or am I mistaken?

 

It was still way cheaper than letting the dealership do it. If you have ever dropped your pan to drain the ATF and change the filter the small cost for a pan and bung is waaay worth it. IMHO

 

Jimbob, The bung you purchased. From whom?? Did a great job on the welding, Tig??

 

Not for me. I don't have any welding tools 9r remember the skills I had 30 years ago so I will have to hire a welder. From what I see, it's the same as any other pan drop I have done except this is 3 pan drops, right? We used to loosen all the pan bolts, put the drain pan under the pan and loosen the bolts more to empty the pan as much as possible before removing the bolts altogether.

 

Maybe someone can enlighten me as to why GM does not put drain plugs in trans pans?

 

Why? It's a 50K service. How often do you hit 50K? If this is an oil pan, I agree that loosening the bolts and all that is not a good thing. This is a 50K service so what does it matter? They plan for a shop to service it not DIY.

 

For the DIY people, how do you do Tripple Flush without dealer equipment?

 

1. Locate the Fill and Guide Plugs:The fill plug is on the top passenger side of the transmission.The guide (or level check) plug is on the front driver's side.

2. Prepare the Transmission:Ensure the vehicle is parked on a level surface.You may need to elevate the vehicle to access the fill and guide plugs.Consult your owner's manual for specific instructions related to your vehicle.

3. Add Fluid:Insert a funnel into the fill plug opening.Add the specified transmission fluid (Mobil 1 synthetic LV ATF HP for the 8L90).Add fluid until it starts to trickle out of the guide plug.This method prevents overfilling.

4. Check the Fluid Level:You may need to start the engine and cycle through the gears to get an accurate reading from the guide plug.The transmission needs to reach a specific temperature (depending on the vehicle and usage) to ensure accurate fluid level readings.

5. Important Considerations:The 8L90 transmission was designed to fit within a six-speed transmission case, which can make fluid and filter changes more challenging. Avoid overfilling the transmission, as it can cause aeration and foaming, which reduces pressure in the clutch packs.

 

This is the triple flush or just a simple fluid change?

 

I would love to see how you put a funnel on the fill plug for an A8 transmission.

 

That is DIY instructions. Sounds like a simple fluid change but if you repeat it, I would think it becomes the triple flush. In our case, you drop the pan and the machine seems to be just for filling.

 

 

Don't know. Them were the instructions I could find. I'd never want to do that kind of work in my garage. Maybe a funnel with some sort of tube?

 

To me, logically, requiring a triple flush and all the steps, effort to fo it by the Service Bulletin, the overall point is to rid the whole system of the old bad fluid. Given that and knowing a filter of any kind holds a certain amount of the fluid it's immersed in, why would anyone, leave the filter with old fluid, in ? It doesn't make any sense.

 

Unless I am selling it tomorrow, I would think that after the 3rd pan drop, I'd change BOTH the gasket and filter.

Yes, I was next to the guy at the parts store when he asked for fluid for a transmission fluid change. Parts guy suggested a filter. This will kill you. "Nah. I'm selling it and if the fluid looks clean, they won't check the filter.". I wonder why I am so skeptical about sellers.

 

Absolutely on both counts.