Auto trans oil temp

quattro
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Auto trans oil temp

Postby quattro » Wed Feb 14, 2018 8:54 pm

A friend has a 1kz surf, it has a bigger oil cooler fitted but when towing a 1500kg load up steep hills the at oil temp light is coming on.

What temp does it come on at? Is it a sign that the trans is on the way out? It drives and shifts fine tho
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Henry
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Re: Auto trans oil temp

Postby Henry » Thu Feb 15, 2018 8:42 am

HI

Towing with that transmission requires you to use it as a manual or it will overheat.
The torque converter will not stay locked up and that is where the issue is.
I have a temp Guage fitted to mine and tow a caravan over the Arthurs pass with no issues. I do control which gear it is in and will change down early.

quattro
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Re: Auto trans oil temp

Postby quattro » Thu Feb 15, 2018 9:23 am

It is being locked in 2nd, sometimes 1st depending on how steep it gets.
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tweake
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Re: Auto trans oil temp

Postby tweake » Thu Feb 15, 2018 4:36 pm

probably more likely its a crap cooler or poorly installed.
i'm used to the aussie guys with overheating surfs and they don't have to much problem even in their 40+ heat.
a few guys on here have had issues and its been the coolers.

post up some pics of it.

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mike
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Re: Auto trans oil temp

Postby mike » Fri Feb 16, 2018 10:00 am

I use low range. You can climb under the truck and on the gear box around where the levers are is a couple of plugs. I just slipped one apart and that allows 2wd low range, the button has to be pressed to engage 4wd now. The plug allows automatic engagement of 4wd when it detects the low range selector moved. Really simple mod to do and awesome. I tow my S3 LR and trailer (near on 2.5t) up steep hills like it. much much better than high range.
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kbushnz
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Re: Auto trans oil temp

Postby kbushnz » Fri Feb 16, 2018 4:08 pm

The trans temp warning light comes on around 120 C.
Typical normal running temp is about 55 to 60C but this varies depending on load etc etc.
The biggest heat generator is the torque converter... So if you dont have the converter locked and its doing its slipping thing it will generate a heap of heat.
There are mods you can do to improve the flow in the converter circuit but this will require the valve body to be sent away to someone who knows how to tweak it.
You can do a mod to manually lock the converter.
Also a good cooler helps.
The aussies have developed some good stuff with the Hilux / Prados for towing. Better converters and valve bodies.
Also kits to do the lock up trick.
Cheers Calvin
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mike
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Re: Auto trans oil temp

Postby mike » Fri Feb 16, 2018 4:17 pm

The manual lockup is good. I just installed a switch into a wire (providing power) and it locks it up at the touch of a button. Just have to be careful not leaving it locked when stopping all of a sudden or slow speeds.
1973 SWB Land Rover V8 Hybrid
1994 Toyota Surf

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