L322 8 speed box problem

Bemble · Sep 12, 2023

Resetting adaptions is unlikely to be problematic unless one or more of the solenoids is faulty. Unfortunately, solenoid issues with the 6HP26/28 are not uncommon, so there is an element of risk. Land Rover instruct their technicians not to reset the adaptions following a fluid change to avoid risking burning out the clutches during the re-learning process. If you’re considering resetting the adaptions without a hardware/firmware change you should read the values first, to ensure that none of them are on the limit.

https://www.landyzone.co.uk/land-rover/tdv8-56-plate-gearbox-knackered-options.330242/#post-4261119

Phil

marjon · Sep 12, 2023

Bemble said:
Resetting adaptions is unlikely to be problematic unless one or more of the solenoids is faulty. Unfortunately, solenoid issues with the 6HP26/28 are not uncommon, so there is an element of risk. Land Rover instruct their technicians not to reset the adaptions following a fluid change to avoid risking burning out the clutches during the re-learning process. If you’re considering resetting the adaptions without a hardware/firmware change you should read the values first, to ensure that none of them are on the limit.

https://www.landyzone.co.uk/land-rover/tdv8-56-plate-gearbox-knackered-options.330242/#post-4261119

Phil

Is this all the same with the ZF8 which is the box @kermit_rr has.

J

kermit_rr · Sep 12, 2023

And is firmware available? The box is still used so things must have got better

Bemble · Sep 12, 2023

The problematic proportional solenoids used in the 6-speed i.e. 0501 213 959 (blue cap) and 0501 213 960 (yellow cap) are no longer used in the 8-speed, which instead uses 0501 218 796 (orange cap) and 0501 218 797 (white cap). It’s therefore possible that the design of these later solenoids has been improved to eliminate the issue. I would still check the existing adaption values before risking resetting them, though. In general terms, the long-term adaptions are there for a reason and shouldn’t be reset unless there has been a software/firmware update or Mechatronic components (such as the solenoids) have been replaced.

Phil

nevillen · Sep 14, 2023

You should definitely do the reset, I did it on our pig of a GM 5 speed box and it has worked wonders!

kermit_rr · Sep 14, 2023

Right, something new, which stacks up which what I've experienced before.
In manual 2nd, foot off both pedals.. 2000rpm and slowing, revs drop with speed so TC locked, get to somewhere around 1600?rpm and box goes into neutral!! Revs drop immediately to idle so the TC isn't doing anything at all

marjon · Sep 14, 2023

kermit_rr said:
Right, something new, which stacks up which what I've experienced before.
In manual 2nd, foot off both pedals.. 2000rpm and slowing, revs drop with speed so TC locked, get to somewhere around 1600?rpm and box goes into neutral!! Revs drop immediately to idle so the TC isn't doing anything at all

And it it went much lower it would stall the engine? don't see why that's of concern?

Goes into neutral how can you tell?

J

kermit_rr · Sep 14, 2023

marjon said:
And it it went much lower it would stall the engine? don't see why that's of concern?

Goes into neutral how can you tell?

J

On any other auto I've driven, as you slow down, the TC unlocks and it behaves like a normal slushmatic and if you accelerate, engine speed climbs quicker than road speed then drop again as you lift off.
What's happening here, TC is locked as you'd expect at 2000 rpm, lift off and reeves drop with engine speed. Car slows a bit more and engine drops to normal idle speed. At this point i would expect the TC to be connected but unlocked (as when you drive off from stationary) but it's not, you can rev the engine freely up to the point it cut off and there's no road speed increase at all as if you've put your foot on the clutch.
At this point if you rev up to the point it cut off, the TC locks up again which is why i get the bang in the transmission, there's no normal 'slushmatic'
It might not be in neutral as such, but it's transmitting zero power to the wheels

Sorry for the ramble but don't know how else to explain

kermit_rr · Sep 14, 2023

I don't know if it's a glitch in the system or slippage, but i was on cruise doing about 50 in a high gear, got on the accelerator and the revs briefly spiked 500rpm for a split second. Repeatable on other gears

rich28uk · Sep 16, 2023

Is there any decent auto transmission place near you? The one I use are very good just to phone up and speak to, and will allow time for you to drive up let them have a test drive in it and tell you what they think is wrong, without charge. Sometimes worth phoning a place like that see their view on it. Last time I had it with my td6 I was reversing on driveway and went from R to D to straighten up then back to R and had lost it on the dashboard but still showed on selector, phoned them to ask what he thought his words were “sounds like cable, probably corroded and broken away, look under car and you’ll see cable is slack” sure enough it was that, quick bodge with copper wire to hold it together and it plodded on another week before new cable was fitted.
I will say when my td6 was in for service he had a lot of BMWs, LRs etc all with the 8 speed box in for service & repair.

L322 8 speed box problem

Bemble

Well-Known Member

marjon

Well-Known Member

kermit_rr

Very

Bemble

Well-Known Member

nevillen

Well-Known Member

kermit_rr

Very

marjon

Well-Known Member

kermit_rr

Very

kermit_rr

Very

rich28uk

Well-Known Member

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