L322 How to completely flush transmission

Hi

Do any guides exist on here on completely dumping atf ? Obviously changing the fluid only changes half. Checked my level today and my lovely pink atf is as bad as before. I could only change 6 ltrs. Meaning 6 ltrs of crap stuff remained.

I assume I need to pull cooler lines etc to empty torque converter etc.

I believe it's a transmission off job

Go to a place that had the proper equipment. It’s pretty much a dialysis machine

D2206 said:

Go to a place that had the proper equipment. It’s pretty much a dialysis machine

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Yes seen videos. Wasn't sure if I could connect via cooler to flush torque converter. I'm ignorant.

marksman said:

I believe it's a transmission off job

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No it can be done in situ

Could you gently blow air down cool hoses to gearbox ?

paulpdh said:

Could you gently blow air down cool hoses to gearbox ?

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Sure I read that a full change is not recommended due to lumps of crud trapped in corners of the gearbox being disturbed.

Container of fresh fluid on cooler return pipe, and empty bucket on cooler flow pipe. Let the transmission replace the old with new ?

pwood999 said:

Container of fresh fluid on cooler return pipe, and empty bucket on cooler flow pipe. Let the transmission replace the old with new ?

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Yes thats what I'm thinking. If you change from box it's only 5 or 6 litres. The remaining 6 is in the pipework and torque converter

My oil sample today after changing fluid 3 weeks ago.

Clearly mixing with old crap

tomcat59alan said:

Sure I read that a full change is not recommended due to lumps of crud trapped in corners of the gearbox being disturbed.

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Yes really difficult to know. It could kill the clutches

paulpdh said:

Yes really difficult to know. It could kill the clutches

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If a fluid change kills the box, chances are it’s ready to be replaced anyway. At least with the proper flushes they drain as much out as they can.

paulpdh said:

Yes really difficult to know. It could kill the clutches

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Have a search I'm sure @Saint.V8 posted something about keep changing the oil until it eventually clears ish.

D2206 said:

If a fluid change kills the box, chances are it’s ready to be replaced anyway. At least with the proper flushes they drain as much out as they can.

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Yes agreed. If its knackered nothing will change that fact

tomcat59alan said:

Have a search I'm sure @Saint.V8 posted something about keep changing the oil until it eventually clears ish.

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Yes I might just dump and refill, another filter and pan off again

I changed the oil in mine x3 or 4 times to clear it out tbh you could go the flush route via the gearbox oil cooler but that's another world of pain when the push fit connectors, yes I did say push fit fall apart as you try to remove the lines from the cooler.

biketeacherdave said:

I changed the oil in mine x3 or 4 times to clear it out tbh you could go the flush route via the gearbox oil cooler but that's another world of pain when the push fit connectors, yes I did say push fit fall apart as you try to remove the lines from the cooler.

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Yes agreed. I think I'll change it again and another further change in a month. I really don't need extra hassle from it. So best no go looking for it. Cheers for your reply. Did you do filter everytime?? Drop the pan

You dont need to leave it a month just go for a drive for half an hour, just fitted a new filter 1st time round job done

biketeacherdave said:

You dont need to leave it a month just go for a drive for half an hour, just fitted a new filter 1st time round job done

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Yes I done the filter a few weeks back took the pan off. OK I understand you're saying instant change after quick drive

The oil will have been circulated in a very short time so drain, refill go for a drive, repeated. I bought a massive drum of ATF for mine at the time.