Spec on D4d coolant system and water pump.

[Soll]

Hi!

I’m a newbie on this great the forum and have just purchased a D4D /auto Landcruiser 90/prado.
I’m planning to mount a Laminova heat exchanger/cooler for the transmission to prevent trans failure caused by cooling fluid getting in the trans oil.

To order the right unit I’m trying to find out specifications for the cooling system and the water pump. Toyota here in Sweden couldn’t help me at all.

Does anyone know where I might get this info? Is the a repair manual (Haynes or similar) that might have the info?

I would like to know:
How much water the pump flows per sec.
What’s the water temp out of the radiator.
Size on the coolant connections.

What’s the trans oil temp before the cooler.
Size on the oil connections.

I apologize for poor English.

Best regards

 

[tundra]

Hello Soll
Did you have actualy a problem with the trans oil/ radiator?
This defect is quite rare, but it hurts. I already experienced it.
@ Buschtaxi.org (germanspoken-Forum) there are some oher Victims...

As repair I exchanged the radiator and all liquids - since then no further problems.

Take a look @ this solution: http://www.hemmi4x4.ch/AutomatenKuehler.htm
this installation was selected because of high additional load and high cooling needed in the desserts of Africa on sandy underground - Not actually a Problem with the existant Radiator.

I recommend to you to close the connections of the ATF direct at the radiator and insert a separate oil cooler for the ATF Circle.
So you use the radiator onyl for the Engine cooling.

Greetings from the Swiss Alps

Tundra

 

[Soll]

Hi!

I've owned the car for just a week and haven't had any problems yet. But since a lot of Swedish and Norvegian LC owners has experienced the problem i figured it's only matter of time before it's my cars turn.

First I thought of just disconnecting ATF lines to the radiatior and replace it with a trans cooler but that way the ATF will not be heated when cold.
The Laminova heat exchanger therefor looked like a good solution.

So your would recomend me to just change the coolant fluid regularly and maybe change the ATF connections to radiator and hope for the best?

/Johan

 

[tundra]

Hi!

I've owned the car for just a week and haven't had any problems yet. But since a lot of Swedish and Norvegian LC owners has experienced the problem i figured it's only matter of time before it's my cars turn.

First I thought of just disconnecting ATF lines to the radiatior and replace it with a trans cooler but that way the ATF will not be heated when cold.
The Laminova heat exchanger therefor looked like a good solution.

So your would recomend me to just change the coolant fluid regularly and maybe change the ATF connections to radiator and hope for the best?

/Johan

Hi Soll
The primarily Problem is inside the Radiator: The Chambers of Water and ATF are in the same Radiator...
Inside the radiator the he cell-wall can burst and the water with the ATF is mixed.

The consequences:
When You have the ATF in your Engine Cooling System, you must change all Rubber parts in the Water collant system, becose they swell and become leaky.

The cooling Water (With Alcoholic freeze protection, of corse!) inside the Automatic Transmission corrodes the clutch disks. This mixture from clutch liner and liquid attacks the Solenoids and the "brain" of the control-Unit.

Contamination of Water in the ATF-Oil - Take a look at the Oil Filter :

In my Opinion to change the Liquids dont helps. A correct protection offers only by separate the two cycles Water v/s ATF.
I dont know until now this Laminova heat exchanger, but it looks useful to solve the Problem.

Further a weak point are the Fittings of the ATF-Tubes, where they are connectet to the Radiator: fIttings are made in Aluminium, the Radiator Case is made in Steel => so we have together with humiditiy and a lot of Salt on te Roads in Wintertime best conditions for corrosion. Solution:
If you paint the connections, then is there no contact corrosion. Additionally you add a thick layer grease to protect from teh Salt & Water.

I hope, I can give You a little help with these explanations

Greetings from the Swiss Alp's

Tundra

Sorry, for my poor English, Thanks to http://www.systranbox.co.uk

 

[Soll]

I've talked to Laminova and they say the heat exchanger would work great in this application. Although to get me the right cooler they would like to know how much water the water pump flows. Temperature on the ATF oil before the cooler etc.

When that is sorted out I'll need to work out where to mount it. The hose between the radiator and motor looks very short. But with some silicone elbows I should be able to work it out.

I really appreciate your input!


Laminova online

 

[tundra]

Hello Soll
Unfortunately I cannot help you with the accurate Waterflow values: I possess only the manuals for the 1-KZ-TE, there is anything written about the quantitiy.

But i found some Spec. about the A-343F Tranny Temps in the manuals:

• The Normal Operating Temperature Range is about 50-80C Celsius
• The Range of the ATF Temp Sensor:
  • @ 20 C Celsius ==> 12k Ohm
  • @ 110 C Celsius ==> 770K Ohm

I did not find anything, at which temp the AT Temp Controlllight in the Instruments beginns to shine. Sorry

I wish you a Lot of Fun with intended changes.

Greetings from the Swiss Alp's

Tundra