Autobox L322

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eurorover

New Member
Posts
6
Hi all. My autobox is jerking into gear and after 5-6 mins I get the 'Trans fail safe mode 5th and reverse gears only. Car will go straight into reverse but then select a forward gear it takes a good 10 to 15 seconds to select and then clunks in. Is it worth doing a fluid change or a new box?
car is 2004 L322 4.4 V8 Auto
 
Does the transmission perform okay when it’s cold and then failsafe appears only once it has warmed up and then it reverts to working okay again once it has cooled down i.e. failsafe disappears? Or is the failsafe message there all the time?

Is it definitely failing safe into 5th gear rather than 4th gear. This is significant. 4th is the default. 5th would indicate an issue with the A-clutch.

Phil
 
Hi Phil thanks for response. All gears work when cold and jolt/jerk into each gear it is not smooth. Goes into reverse no problem. Fail safe come on when warm once cold it will drive for 5-6 mins before failsafe comes on. shoes 5th on dash display.
 
Well it’s certainly worth checking the fluid level, but I’m afraid it sounds like the axial needle roller bearing between the B-clutch hub & C-clutch drum has failed and allowed the input shaft to slide inside the B-clutch drum, splitting the O-ring which seals the A-clutch.

Bearing%20then%20O-ring%20Failure_zpsqz654cdq.jpg


O-ring%20Split_zpss4ycn3uw.jpg


When the fluid is cold the pump can keep up with the leakage. Once it heats up, and the viscosity reduces, the pump can no longer keep up and the pressure on the A-clutch drops, allowing it to slip. The controller senses the slip and immediately puts the transmission into failsafe. Once the fluid cools down, the cycle repeats.

Because the A-clutch is used in all gears except 5th and Reverse, these are the only gears that continue to operate.

Phil
 
Thanks Phil very good info. So not a DIY job then. Replacement box it is ohh cant wait to change it.....
 
Well it’s certainly worth checking the fluid level, but I’m afraid it sounds like the axial needle roller bearing between the B-clutch hub & C-clutch drum has failed and allowed the input shaft to slide inside the B-clutch drum, splitting the O-ring which seals the A-clutch.

Bearing%20then%20O-ring%20Failure_zpsqz654cdq.jpg


O-ring%20Split_zpss4ycn3uw.jpg


When the fluid is cold the pump can keep up with the leakage. Once it heats up, and the viscosity reduces, the pump can no longer keep up and the pressure on the A-clutch drops, allowing it to slip. The controller senses the slip and immediately puts the transmission into failsafe. Once the fluid cools down, the cycle repeats.

Because the A-clutch is used in all gears except 5th and Reverse, these are the only gears that continue to operate.

Phil
@Bemble .. Have you quite finished showing off now????:p;)
 
Thanks Phil very good info. So not a DIY job then. Replacement box it is ohh cant wait to change it.....
If you’re reasonably handy with a set of spanners there’s no reason that you can’t fix this yourself. Stripping, fixing and rebuilding the transmission is the easy bit. Getting the thing out of, and back into, the vehicle is by far the hardest part.

People seem willing to tackle complex engine jobs yet, when it comes to transmissions, they think there’s some kind of witchcraft involved and it’s a black box that no one should dare delve in to. This is absolutely not the case. Automatic transmissions are a darn sight easier to rebuild than any engine.

All%20parts_zpspij1mjfx.jpg


Phil
 
Phil, I would like to bow in respect of your knowledge and sense of humour.
Tricky.
PS. I still drive my SC buy manual shift up to overcome the 3 to 4 jolt and failure message but have promised myself to get it sorted very soon.
 
Thanks Phil very good info. So not a DIY job then. Replacement box it is ohh cant wait to change it.....
If you don’t fancy doing it yourself then take it out or get somebody to take it out and send it to Benble and he can sell you a new one that is as good as the day it was born if not better.. Buying second hand or one that hasn’t been properly refurbished is a painful game.
 
I am good with engines spanners and hammers but I would not fancy stripping an auto box down. The question is how much is it to sort the box
 
People seem willing to tackle complex engine jobs yet, when it comes to transmissions, they think there’s some kind of witchcraft involved and it’s a black box that no one should dare delve in to. This is absolutely not the case. Automatic transmissions are a darn sight easier to rebuild than any engine.

All%20parts_zpspij1mjfx.jpg


Phil

Your knowledge & experience is a great asset to the forum Phil, many years ago I had asperations in this direction as I love the combination of precision engineering & the cleanliness associated with auto-box overhauls, but to my shame I have left it far too late in life now :(
 
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I rebuilt my box under the guidance of Phil and it was a pleasure and very easy when somebody else knows how and I also had my mate help me who is an obsessive mechanic built like a gorilla; the hardest part is taking the box out and back in again as it’s the weight of a family car. If you organise one of Phil’s recon transmissions into your range then it will most likely outlive us all and the rest of the vehicle :)
 
If you’re reasonably handy with a set of spanners there’s no reason that you can’t fix this yourself. Stripping, fixing and rebuilding the transmission is the easy bit. Getting the thing out of, and back into, the vehicle is by far the hardest part.

People seem willing to tackle complex engine jobs yet, when it comes to transmissions, they think there’s some kind of witchcraft involved and it’s a black box that no one should dare delve in to. This is absolutely not the case. Automatic transmissions are a darn sight easier to rebuild than any engine.

All%20parts_zpspij1mjfx.jpg


Phil

I think i've just had a "moment".. ;)

Wouldn't mind doing that ;)
 
Thing I found when stripping down my transmission was one big lump after another comes out in sequence and then each big lump breaks down in to smaller parts.
As much as the 4.4 M62 L322 is a challenge I do love stripping down the engine and transmission. The transfer box is also easy to deconstruct and also a waste of time in my case as Phil said it would be.
 
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