L322 AFTERMARKET TRANSMISSION COOLER INSTALLED

[tebone]

Hi Guys FYI,
I just installed an aftermarket transmission cooler just behind the grille. In the past I've had trouble with the tranny getting hot and staying in 3rd gear until it cooled down when towing a caravan.
I've just put the l322 to the test towing up/down a steep hill where it would normally get hot and stay in 3rd gear.
Test results: Tranny stayed cool and shifted through all gears no problems. You could even rest your hand on the cooler with out burning it.
I failed to mention its a ZF5hp24 (petrol 4.4).
The original cooler has radiator water flowing through it all the time to heat/cool your tranny fluid. I believe this was the problem not allowing the fluid to cool quick enough. I think this is good for cold conditions but not towing in Australian conditions.
The two flexible hoses that go to this cooler unclip from the cooler. You have machine two adaptors that will plug into the hoses so you can attach your aftermarket hoses and cooler.
Also I serviced my own transmission, installed new filter. Its quite easy the tranny took approx 6 litres using Nulon oil. You have to allow a little more oil with the new cooler and pipe work.

Filter $75
Oil 20Litres $230
Cooler/piping $120
Adaptors $50

Ps. Keep the transmission cool and change oil every 40k and you shouldn't have any problems.

Regards Paul

[33chinacars]

Hi tebone

Did you bypass original cooler & what were the adaptors for. What cooler did you use & did it have a fan with it. Any pic's

Had been told by a mechanic that needed 250psi cooler. Ones I've looked at only 100 psi

Thanks Gary

[tebone]

Hi tebone

Did you bypass original cooler & what were the adaptors for. What cooler did you use & did it have a fan with it. Any pic's

Had been told by a mechanic that needed 250psi cooler. Ones I've looked at only 100 psi

Thanks Gary

Hi Gary,
I used a plate finned cooler instead of a tube cooler. I did bypass the original cooler. I'm not sure what its rated to but 250psi in the cooler line seems very high. I made a male adaptor piece to slide in the original flexible hose which has two orings inside. The way it seals in there it wouldn't be rated to 250psi (I could be wrong)
I don't have any photos but I could draw up the adaptor piece to show diminsions this would save you cutting original flexible lines.

Cheers Paul

[tebone]

45335

Hope this helps

[33chinacars]

Thanks tebone will see how I go

Gary

[Taffi]

Hi, Just wondering were you got the oil cooler from? Any pics? Sounds like a good answer to a L322 popular problem.

[tebone]

Hi, Just wondering were you got the oil cooler from? Any pics? Sounds like a good answer to a L322 popular problem.

I just come back from a easter trip in the Vic high country ( Licola ). I was towing my van and using the gears on the sports mode after a very long series of hills the auto locked in 3rd again, not happy!!!!!!!!!!!!. I stopped and put my hand on the cooler it was hot but not extremely hot its got me guessing what temp it goes into 3rd. I've just bought another cooler tonight of ebay. I will be running two coolers now both are 280mm x 180mm x 19mm thick, hopefully this will fix the problem. I will take some pics when I fit the next cooler and some pics of the adaptors as well.
One thing I noticed the fluid cooled down alot quick than originally which allows full selection of all gears.

Has anyone else exprienced this before transmission fluid getting hot and locking into 3rd gear?

Regards paul

[romar]

can I also get a copy/drawings of those fittings, romar49@bigpond.net.au thanks Roger.

[romar]

where did you buy the cooler and what type/grade tranmission oil do you use

[33chinacars]

Here is a list of the correct lubricants for 02-05 L322's

Recommended Lubricants - fullfatrr.com Wiki (http://www.fullfatrr.com/wiki/Recommended_Lubricants)

Gary

[tebone]

Hi Guys,
Here are some pics of the two coolers mounted and the adaptor pieces.


46118

46119

46120

46121

[justinc]

PWR Aluminium Radiators, Intercoolers & Oil Coolers (http://www.pwr.com.au/#/view=products/s=os/)

These guys make seriously good quality coolers but most importantly they are available with larger tube sizes, IMO this is quite important to retain the flow rate to at least the same as the factory cooler.

JC

[RoverNova]

Hi guys i just want to add some information on Transmission Oil Coolers.

Now you can have as many oil coolers as you want but at the end of the day if you restrict the flow of the oil the transmission will over heat.

The way cooling systems work on automatic transmissions is by making use of the exhausted oil left over from the pump once the Regulator valve has sent the corrected pressure to the valve body.

This left over pressure then tracks to the cooler and then back to the transmission and usually it returns to the gear sets as lubrication/Cooling. Now there is a fail safe in the system which allows oil to return to the sump if the cooler blocks or is restricted or some sort of over pressure issue as a back pressure into the pump would cause major issues.

After you fit your coolers i recommend doing a flow check as the return line of the transmission. With the help of someone have the line off the transmission and start the car in park @ idle. With a bottle at least 2 litre's or larger to catch the oil count how many seconds it takes to catch at litre 1 litre.

Recommended flow is 1 litre for 15 seconds Bad flow is 1 litre 30 seconds. (This is just a reference point i use it not a pacific ZF flow measure)

Also this fitting i make may also be suitable if you buy one and it doesn't send it back for a full refund

http://www.furiousperformance.com.au/images/Furious/FP-0608.jpg


Cheers
Rhys

[RR P38]

I would be getting down to Enzed or hose doctor and getting some decent hose fittings on the lines.
Utilux hose clamps are a bit under rated for such an application i feel.

[Slunnie]

I would be getting down to Enzed or hose doctor and getting some decent hose fittings on the lines.
Utilux hose clamps are a bit under rated for such an application i feel.
Yep!

My experiences (note plural) are that the ZF's specifically run very high line pressure through the lines and coolers in comparison to other transmissions. About 120psi or something like that. plain, flared etc fittings with any number of hose clamps will eventually blow apart. You need to run a cooler that will take the pressure (and flow), not just a normal ATF cooler, and you need to run proper pressure fittings like Pirtek fittings etc. After trying a few, the one that I have found to be good is the one that Davis Performance Landys sell - thats not at all to say that there are not others, but this one has been reliable.

[RoverNova]

The ZF Transmission do run hi pressure compared to other transmissions but its not so much to be really worried about if you cover all bases.



Brass Barb fittings are no good unless its has a really good angled barb on the end with a straight shaft section.



Clamps also need to be good quality i use Wurth clamps and never had one blow yet.



PWR transmission coolers scan be used with out issue as they have a rough raw alloy surface which the hose grips to.
Transmission Hose is also important as it is designed to work with ATF and also barb fittings. Push lock hose or hard wall hose will blow of a regular barb.
Don't be scared to use one clamp with the right hose & fitting. The speedflow 411 series Barb to AN adapters have Never failed me with the ZF6HP coolers kits i make for the falcons and that is with owners mostly fitting them.



The more hose you have to push on to then allow more clamps is the start of all your problems.


FYI i am working on a new fitting which will allow the removal of the painful quick release hoses and allow you to run -8AN braided Hoes & fittings. Luckily the New Ford Territory runs the same size cooler pipe and fittings as the Rovers.



Cheers
Rhys

[RoverNova]

Yep!

My experiences (note plural) are that the ZF's specifically run very high line pressure through the lines and coolers in comparison to other transmissions. About 120psi or something like that. plain, flared etc fittings with any number of hose clamps will eventually blow apart. You need to run a cooler that will take the pressure (and flow), not just a normal ATF cooler, and you need to run proper pressure fittings like Pirtek fittings etc. After trying a few, the one that I have found to be good is the one that Davis Performance Landys sell - thats not at all to say that there are not others, but this one has been reliable.

How does the Davis Performance Landys cooler hook up the the Rover lines & Cooler?

[uteman]

Is there any known reason why I could not fit the cooler(s) to a TD6?

[peter g]

Just wondering if anyone has done anything further on upgrading transmission coolers on the L322 TD6/GM box combo. It seems that my trannie has failed because of overheating. (see post on best place in Melb to repair auto). This is despite only towing a 900kg (loaded) trailer. A&B say that the OE unit should be more than adequate to tow my replacement off road van at 1.5 tonne, however after having one very inconvenient failure I want to make sure !
Peter

[Maxintosh]

Have burnt two ZF5HP24 (4.4L) gearboxes now :censored:

Wish I had noticed this thread before!

Had previously looked at running inline air finned coolers after the original Behr watercooled unit before, but three transmission specialists in Melbourne and Bendigo told me that they could not find enough space to fit them.

Perhaps we could start a list/sticky for instructions/parts that are known to be good, prices, and where to get them.

[peter g]

but three transmission specialists in Melbourne and Bendigo told me that they could not find enough space to fit them.

Yes, that is also what they are telling me. From reading the UK site it seems that the problem is mostly with the 4.4 engine, is it unusual to have this problem with the TD6 ??
Peter

[donrover0]

For the TD6/GM 5L40E, it is also used in a number of Oldsmobiles in US and Commodores here in Oz; They recommend Dexron VI, and not even synthetic!
I've used in my TD6 auto; a full synthetic, Nulon ATF, Dexron VI.

[adem350]

45335

Hope this helps

Hi not sure if this will work but many thanks for information

Adrian

[cessery]

[Have had the same problem. Would like to know what size and where did you get your cooler from. Cheers charles

[bigsmile]QUOTE=tebone;1656646]Hi Guys FYI,
I just installed an aftermarket transmission cooler just behind the grille. In the past I've had trouble with the tranny getting hot and staying in 3rd gear until it cooled down when towing a caravan.
I've just put the l322 to the test towing up/down a steep hill where it would normally get hot and stay in 3rd gear.
Test results: Tranny stayed cool and shifted through all gears no problems. You could even rest your hand on the cooler with out burning it.
I failed to mention its a ZF5hp24 (petrol 4.4).
The original cooler has radiator water flowing through it all the time to heat/cool your tranny fluid. I believe this was the problem not allowing the fluid to cool quick enough. I think this is good for cold conditions but not towing in Australian conditions.
The two flexible hoses that go to this cooler unclip from the cooler. You have machine two adaptors that will plug into the hoses so you can attach your aftermarket hoses and cooler.
Also I serviced my own transmission, installed new filter. Its quite easy the tranny took approx 6 litres using Nulon oil. You have to allow a little more oil with the new cooler and pipe work.

Filter $75
Oil 20Litres $230
Cooler/piping $120
Adaptors $50

Ps. Keep the transmission cool and change oil every 40k and you shouldn't have any problems.

Regards Paul[/QUOTE]