AL4 Transmission PDF

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k2col
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AL4 Transmission PDF

Post by k2col » 29 Jan 2009, 22:29

Hi,

thought this might come in handy for someone, some day:

CITROEN TECHNICAL TRAINING

Presentation of the AL4
Automatic Transmission

http://www.scribd.com/doc/6338026/AL4-Transmission



Enjoy,
Colin

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CitroJim
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Re: AL4 Transmission PDF

Post by CitroJim » 29 Jan 2009, 22:49

k2col wrote:Enjoy
Thank you Colin, I did :D

The AL4 is a very similar 'box to the 4HP20 on the V6 and that document has helped resolve some confusion I've seen in other forums between the AL4 and 4HP20.

Excellent stuff. Safely downloaded as a PDF and kept safe for future reference :D

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hirsty
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Post by hirsty » 30 Jan 2009, 00:49

Thanks Colin. I have the AL4 box and having scanned through the manual I am amazed at the complexity of the beast.

Jim; Does your Lexia have the capabilities and leads for this box?

Keith

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Post by jmd » 30 Jan 2009, 02:45

Thanks Colin. However as regards recommendations to check & top up the oil every 60,000 Km, while desirable. The AL4 behaves much better if it is drained (you can get 3 Ltrs out) every 30, 000 miles & the oil replaced. At least mine did. Thanks again.

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CitroJim
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Post by CitroJim » 30 Jan 2009, 07:28

hirsty wrote:Thanks Colin. I have the AL4 box and having scanned through the manual I am amazed at the complexity of the beast.

Jim; Does your Lexia have the capabilities and leads for this box?

Keith
Yes, I have to admit, these modern autoboxes appear to be fearsomely complex beasts but fundamentally, they work exactly the same as say, the good old-fashioned Borg Warner and the like. As always, it's the electronics that make them look complex...

My Lexia lays bare the secrets of my 4HP20 Keith, so i see no reason why it should not do the same for the AL4.

Take careful note of the AL4 "Oil Wear" indicator :twisted: This WILL eventually put the 'box into "limp home" mode (Snow and Sport lights flashing) and will need the attentions of a Lexia to reset it - after you've done an oil change..

Hopefully, and based on my 4HP20 experiences, in a while, I'll be able to suggest a way to remove more than 3 litres of old oil when changing :wink:

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Post by addo » 30 Jan 2009, 09:22

A friend and I came to one possible means of achieving a near-complete flush. As yet it's unvalidated.

You can buy "sandwich" adaptors from speed parts suppliers, that fit between the heat exchanger and transmission casing to break out the fluid circuit. The immediate benefit of this, is it allows you to run extra fluid volume via an external stacked plate cooler - a real bonus in places like Australia where traffic snarls on a 35°C day are not that uncommon. After all, the wear indicator responds both to operating hours and fluid temps.

A potential secondary benefit of this adaptor, is to near completely replace the trans fluid. I need to find out the relative location (in the fluid circuit) of the thermostat and pump to determine whether you'd purge with air then add fluid, or just feed in fluid.

My AL4 (locally rebuilt) is bedded in well now at about 16K miles, but still has one harsh 2-3 upshift on light throttle. I reckon it's the software coding much as its flappy, under-fixed subframe.

Regards, Adam.

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Re: AL4 Transmission PDF

Post by Smarty2 » 10 Mar 2013, 15:52

Hi seen this after hunting around for some additive to make my AL4 less crappy. http://www.terraclean.net/product.php?id=8" onclick="window.open(this.href);return false; I e-mailed them about availability in the U.K and they advised for the 2nd quarter of this year, someone will be contacting me then, seems like the perfect machine for this troublesome box!

Mart

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spider
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Re: AL4 Transmission PDF

Post by spider » 10 Mar 2013, 15:56

I sort of wonder if the sandwich adaptor is similar to what they sometimes do in the 'States, they have a machine connected up to the cooler lines and in effect it goes through the machine being replaced while its running. This way the correct amount of fluid is always present but replacing during the run.

You could in theory stick the ends of the pipes into an empty (for out) and full (for in) containers but it would cost a fortune to do it that way, not to mention either being overfilled and blowing seals or being starved of fluid during the process.

What I did with my GM box:

Drained / refilled. Ran for about 60 seconds including holding at stall speed for about 5 seconds a few times, hoping that would circulate around a bit the torque converter. Drain and refilled. Repeated that again, took for a short drive and drained re-filled. It was OK after that but it used (relatively cheap) Dextron3 and I had a lot of it floating around, enough to get away with doing that.

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Smarty2
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Re: AL4 Transmission PDF

Post by Smarty2 » 10 Mar 2013, 16:28

The machine I linked to does all that automatically, really need to give that a go, I added some Archoil 2300 system cleaner to my box yesterday and am running it for a thousand miles and having the fluid changed several times or if this machine is available before then using the terraclean method, seems like its about time someone came up with a machine like this that swaps out all the fluid. :)
As for the sandwich I am toying with the idea of getting this wee beasty fitted? http://www.jpat.co.uk/dpoflyer.pdf" onclick="window.open(this.href);return false;

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CitroJim
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Re: AL4 Transmission PDF

Post by CitroJim » 10 Mar 2013, 17:21

That Terraclean machine is just what we want... Be good to see who has it when it arrives..

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Smarty2
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Re: AL4 Transmission PDF

Post by Smarty2 » 10 Mar 2013, 20:38

CitroJim wrote:That Terraclean machine is just what we want... Be good to see who has it when it arrives..
I will endeavour to let you know, when they contact me that is?

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Smarty2
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Re: AL4 Transmission PDF

Post by Smarty2 » 23 Aug 2014, 13:55

Bumpy bumpy, I never did get a reply from Terraclean, the deal must have gone AoT? Anyone had dealings with these? http://www.alibaba.com/showroom/al4-transmission.html" onclick="window.open(this.href);return false;