rrc auto box oil coolers

[peewee]

i will be changing the 3 speed auto for a 4 speed auto in my 85 range rover soon, i am wandering which oil cooler to use as i have both the 3 speed and 4 speed coolers. is one any better than the other ?

[LOVEMYRANGIE]

The tube coolers fitted to 4spd ZF's are ok but not fantastic.
Have a look at Eaton part number 18025.
You would need to replumb it alittle bit, but the end result is far far better cooling.

Cheers

Andrew.

[peewee]

thanks for that. i will be using one of the standard coolers for the moment but which one? i`m thinking the 3 speed one at the moment. it is allready in the car which helps but it looks like the tube is longer than the 4 speed so may be able to cool the oil better.

[tebone]

thanks for that. i will be using one of the standard coolers for the moment but which one? i`m thinking the 3 speed one at the moment. it is allready in the car which helps but it looks like the tube is longer than the 4 speed so may be able to cool the oil better.

Hi Peewee,
Another thing to consider is are you towing, the best thing for your transmission is to keep it cool. IF I was you I would use the 3 speed one and add in another cooler. Buy a plate cooler (PWR$135 on ebay)and plumb it into your system. I have seen alot of zf4hp22-4hp24 transmissions with burnt discoloured fluid $$$$$. The original coolers are not up to it when towing in hot climates. Hope this helps

Regards Tebone

[richard4u2]

delete

[Skiboy]

Hi Peewee,
Another thing to consider is are you towing, the best thing for your transmission is to keep it cool. IF I was you I would use the 3 speed one and add in another cooler. Buy a plate cooler (PWR$135 on ebay)and plumb it into your system. I have seen alot of zf4hp22-4hp24 transmissions with burnt discoloured fluid $$$$$. The original coolers are not up to it when towing in hot climates. Hope this helps

Regards Tebone
I have a similar problem - What size cooler do you recommend if keeping the hedgehog as well?
Our transmission oil can get to 150deg c on the oil temp gauge - I suspect that is too hot - normally OK if driving along
Skiboy

[tebone]

I have a similar problem - What size cooler do you recommend if keeping the hedgehog as well?
Our transmission oil can get to 150deg c on the oil temp gauge - I suspect that is too hot - normally OK if driving along
Skiboy

Hi, I just brought a TCI plate cooler the size is 11 in. x 9.875 in. x 3/4 in ( Part No. TCI-824104) from summit in USA for US $95. If you only use one make sure you run a thermo fan on it when 4wd.

Regards Tebone

[tebone]

Automatic Transmissions


OIL TEMPERATURE MEASURED AT CONVERTER OUTLET TO COOLER:

300° F=
The maximum allowable temperature. This is the recommended place to install a temperature gauge or sensor. Do not allow the converter outlet temperature to exceed 300° F. The temperature at this location will vary significantly because of load, hill climbing, etceteras. If the temperature reaches 300° F, reduce throttle. To lower transmission temperature with transmission in neutral, run the engine at 1,200 RPM for at least 2 - 3 minutes while keeping a close check for signs of engine overheating. A transmission in a heavy throttle, stall condition (a typical situation is rocking a vehicle stuck in mud, sand, or snow), may increase temperature at a rate of 1° degree per second of stall.



OIL TEMPERATURE MEASURED AT OIL PAN OR SUMP:

150° F=
The minimum operating temperature. Note: It is possible in low ambient temperatures to overcool the transmission with auxiliary oil to air coolers. Oil to water coolers in standard factory radiators will normally not overcool a transmission.


175-200° F=
Normal pan oil temperature operating range.


275° F=
Maximum allowable oil pan temperature for short durations during long hill climbs.


300° F=
Damage occurs to internal transmission parts, including warpage of metal parts, degradation of clutches, and melting of seals. Transmission oil oxidizes, (forming varnish-like substances causing further clutch slippage and compounding heat build up) and transmission oil life is extremely short.

[peewee]

just an idear i had today, has any one tried using two 4 speed coolers together? they will fit easy enough and with a bit of plumbing can be connected ok. any thoughts on this?

[Bradtot]

Yes Peewee i have done just this 2 oil coolers in series ( long tube types )
I had a lot of trouble getting the fittings nobody had them enzed, pirtec, and many other couplers type places. I ended up using brake line fittings but had to drill out the hole to fit my quarter-inch copper pipe.
I annealed the pipe and bent it up to suit, it was a bugger of a job. i have the 2 coolers, one in the original position and one above , I had to move my horns, by the way this is on a 89 Rangie. there is not much room when the coolers re in so I basically had to connect them with the coolers towards the front and then push them back and bolt up. its very difficult to get a spanner behind as the aircon condensor and fans are in the way.
A disco may be easier.
Overall I am very happy ..sorry no pics

Brad:)

[LOVEMYRANGIE]

Yes Peewee i have done just this 2 oil coolers in series ( long tube types )
I had a lot of trouble getting the fittings nobody had them enzed, pirtec, and many other couplers type places. I ended up using brake line fittings but had to drill out the hole to fit my quarter-inch copper pipe.
I annealed the pipe and bent it up to suit, it was a bugger of a job. i have the 2 coolers, one in the original position and one above , I had to move my horns, by the way this is on a 89 Rangie. there is not much room when the coolers re in so I basically had to connect them with the coolers towards the front and then push them back and bolt up. its very difficult to get a spanner behind as the aircon condensor and fans are in the way.
A disco may be easier.
Overall I am very happy ..sorry no pics

Brad:)

parallel is better if using two. Slower oil flow promoting better heat transfer when oil passes thru the coolers, but As you say, fittings may be the issue. A good transmission place should be able to sort this however particularly someone that specializes in autos.

Cheers

Andrew