Toyota New AC60F 6 Speed Auto

[prodoco Junior Member Find all posts View Profile Close prodoco]

Hey Guys, I read a very interesting post from Tacoma Forum another day. Here we go with the Link: https://www.tacomaworld.com/threads/...h-pics.361114/

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Very interesting reading.

[cuda Advanced Member Find all posts View Profile Close cuda]

Hey Guys, I read a very interesting post from Tacoma Forum another day. Here we go with the Link: https://www.tacomaworld.com/threads/...h-pics.361114/

I assume this is the new 6spd in the Prado? Great insite and there is a link there also to Technical service bulletins etc (http://www.ciw.com/atf/2007/intro.html).
Just out of curiosity what are people seeing the ATF temp getting to? Just driving around town I have seen close to 100 deg without towing which seems high. This was taken through the scangauge.

Thanks
Doug

[Hally Senior Member Find all posts View Profile Close Hally]

I assume this is the new 6spd in the Prado? Great insite and there is a link there also to Technical service bulletins etc (http://www.ciw.com/atf/2007/intro.html).
Just out of curiosity what are people seeing the ATF temp getting to? Just driving around town I have seen close to 100 deg without towing which seems high. This was taken through the scangauge.

Thanks
Doug

Same sometimes have got to 105 if driving into head wind and pushing 110kph.
I Brought the cooler upgrade brackets from Tin just haven't had time to hook up hoses to see if helps

[cuda Advanced Member Find all posts View Profile Close cuda]

Same sometimes have got to 105 if driving into head wind and pushing 110kph.
I Brought the cooler upgrade brackets from Tin just haven't had time to hook up hoses to see if helps

Getting Toyota to check it out on Monday. Will let you know what it should be going up to max no tow.

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

I assume this is the new 6spd in the Prado? Great insite and there is a link there also to Technical service bulletins etc (http://www.ciw.com/atf/2007/intro.html).
Just out of curiosity what are people seeing the ATF temp getting to? Just driving around town I have seen close to 100 deg without towing which seems high. This was taken through the scangauge.

Thanks
Doug

Sounds like it runs hot just like the 5 speed A750F. It says that the new 6 speed is physically smaller, does it use the same amount of oil?

[Mild7 Junior Member Find all posts View Profile Close Mild7]

Yeah my 6 speed seems to run a bit hot too. Up to 110 deg C fully loaded inside and on top, but not towing, up hill into the wind.

A bit warm for my liking..

[prodoco Junior Member Find all posts View Profile Close prodoco]

Forgot to mention my16 prado with 2.8 D4D is equiped with AC60F Auto Tran.

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

From the info that I can find for Toyota WS and equivalents the oil viscosity is getting very low at 110C and it is also starting to oxidise which will shorten it's life. I am amazed that these gearboxes are 'sealed for life' and so poorly cooled.

The gearbox may not fail but it won't work at it's best if it is regularly run so hot. You only have to look at the colour of the oil that has been removed from some of theA750F gearboxes to know that there is something wrong with the design.

[cuda Advanced Member Find all posts View Profile Close cuda]

It concerns me greatly that the temp is exceeding 100 deg for other owners. See below explanation of detriment of higher ATF temps

Why ATF (automatic transmission fluid) Wears Out

An automatic transmission creates a lot of internal heat through friction. The friction of the fluid churning inside the torque converter, the friction created when the clutch plates engage, and the normal friction created by gears and bearings carrying their loads.

It doesn't take long for the automatic transmission fluid (ATF) to heat up once the vehicle is in motion. Normal driving will raise fluid temperatures to 80 degrees C., which is the usual temperature range at which most fluids are designed to operate. If fluid temperatures can be held to 80 degrees C., ATF will last almost indefinitely -- say up to 160,000 km. But if the fluid temperature goes much higher, the life of the fluid begins to plummet. The problem is, even normal driving can push fluid temperatures well beyond safe limits, and once that happens, the trouble begins.

At elevated operating temperatures, ATF oxidizes, turns brown and takes on a smell like burnt toast. As heat destroys the fluid's lubricating qualities and friction characteristics, varnish begins to form on internal parts (such as the valve body), which interferes with the operation of the transmission. If the temperature gets above 125 degrees C., rubber seals begin to harden, which leads to leaks and pressure losses. At higher temperatures the transmission begins to slip, which only aggravates overheating even more. Eventually the clutches burn out and the transmission calls it quits. The only way to repair the damage now is with an overhaul -- a job which can easily run upwards of $1500 on a late model front-wheel drive car or minivan.

As a rule of thumb, every 15 degree increase in operating temperature above 80 degrees C. cuts the life of the fluid in half!

At 90 degrees C., for instance, fluid life is reduced to 80,000 km. At 110 degrees, which is commonly encountered in many transmissions, the fluid is only good for about 60 000km. At 120 degrees C., the fluid won't go much over 15,000 km. Add another 20 degrees, and life expectancy drops to 8000kms. Go to 150 degrees C., and 1,000 to 1,500 klm is about all you'll get before the transmission burns up.

If you think this is propaganda put forth by the suppliers of ATF to sell more fluid, think again. According to the Automatic Transmission Rebuilders Association, 90% of ALL transmission failures are caused by overheating. And most of these can be blamed on worn out fluid that should have been replaced.

On most vehicles, the automatic transmission fluid is cooled by a small heat exchanger inside the bottom or end tank of the radiator. Hot ATF from the transmission circulates through a short loop of pipe and is thus "cooled." Cooling is a relative term here, however, because the radiator itself may be running at anywhere from 85 to 105 degrees C.!

Tests have shown that the typical original equipment oil cooler is marginal at best. ATF that enters the radiator cooler at 150 degrees C. leaves at 115 to 135 degrees C., which is only a 10 to 20% drop in temperature, and is nowhere near good enough for extended fluid life.

Any number of things can push ATF temperatures beyond the system's ability to maintain safe limits: towing a trailer, mountain driving, driving at sustained high speeds during hot weather, stop-and-go driving in city traffic. Problems in the cooling system itself e.g.a low coolant level, a defective cooling fan, fan clutch, thermostat or water pump, an obstructed radiator, etc., will also diminish ATF cooling efficiency. In some cases, transmission overheating can even lead to engine coolant overheating! That's why there's a good demand for auxiliary add-on transmission coolers.

[Hally Senior Member Find all posts View Profile Close Hally]

Getting Toyota to check it out on Monday. Will let you know what it should be going up to max no tow.

That would be great thanks also are you going to get them to check your oil level?
Have been doing some reading on these auto and looks like they are running a full synthetic oil which the oil manufacturers in turn say the oil can run hotter

[cuda Advanced Member Find all posts View Profile Close cuda]

Found this also

Found these transmission operating temperature on another forum http://www.tundrasolutions.com/forum...n-oil-temp-be/


Temp...Life
--------------
175....100K
195.....50K
220.....25K (common operating temp for most vehicles)
240.....10K
260......5K
300......1K

[cuda Advanced Member Find all posts View Profile Close cuda]

That would be great thanks also are you going to get them to check your oil level?
Have been doing some reading on these auto and looks like they are running a full synthetic oil which the oil manufacturers in turn say the oil can run hotter

I will be asking them to confirm the correct amount of fluid is in there after reading the link that was attached at the start of this thread.

[Hally Senior Member Find all posts View Profile Close Hally]

Found this also

Found these transmission operating temperature on another forum http://www.tundrasolutions.com/forum...n-oil-temp-be/


Temp...Life
--------------
175....100K
195.....50K
220.....25K (common operating temp for most vehicles)
240.....10K
260......5K
300......1K

Yeah i was reading that one too.
Well checked my oil level this arvo and it seams to be ok was a bit hotter then spec so run out a bit and didn't smell burnt even after temps got to 160

[Hally Senior Member Find all posts View Profile Close Hally]

Finally got to finish the install on Tins oil cooler upgrade today took for abit of a test drive hottest temp was 67 degrees. Very happy with Tins work and all his help in making new brakets to suit the 1gd.
Big test will be easter weekend towing the trailer away