Cooling/Heating

[Albannach]

Whilst vehicle cooling systems are certainly not complex, they do work (if looked after). I've been hypothesising about the effects of not cooling/heating automatic gearboxes on our surfs.

If we by-pass the radiator, the main heat exchanger (the emphasis here being on exchanger), are we over cooling the gearbox oil? Auto boxes won't work properly unless they are hot (over 80 degrees centigrade), if we have no positive heat exchange and only a cooler, would it be possible to have the oil too cold?

I reckon it would be much more efficient to leave the radiator in circuit, but to cool the oil before it. If the oil is too hot, the radiator will cool it, if the oil is too cold, the radiator will heat it. My argument for not having the cooler after the radiator is that we'd be supplying oil too cold for the 'box to work properly.

What do you think?

[Maverick]

I plumbed my aid cooler before the main radiator, so the aid cooler can take excess heat out and the main rad can regulate the transmission temperature.

[TonyN]

I reckon it would be much more efficient to leave the radiator in circuit, but to cool the oil before it. If the oil is too hot, the radiator will cool it, if the oil is too cold, the radiator will heat it. My argument for not having the cooler after the radiator is that we'd be supplying oil too cold for the 'box to work properly.

What do you think?

I think thats what I've been saying and doing for years. So I agree.



(apart from my truck, which has a completely stand alone rad, but it works harder than most trucks)

[Bogus]

Or you could bypass the rad completely and fit a thermostat in your oil cooler circuit. If you do it this way youd need to make sure you had a suitably sized ATF cooler , just sticking in something random from a scrappy might not be the best idea.

[KERRSURF]

I was thinking about this the other night, I think gains could be had from an engine oil cooler instead of going down the transmission cooler route.

Are there any oil cooler kits/ adapter plates for our 3.0 2nd gens that I could buy?

[Bogus]

Somebody, some time back posted up a link to a sandwich plate for the filter housing. Get one of them and it should be easy enough to plumb in an oil cooler. Not sure why you think it needs one though as the big issue always seems to be engine overheating caused by overworked ATF depriving the engine water jacket of its fair share of cooling. Not saying fitting an oil cooler would be a bad thing, just wondering if its really needed.

You might have done this already but sandwich plate is in this thread here and some other oil coolery stuff

http://www.hiluxsurf.co.uk/showthrea...sandwich+plate

[KERRSURF]

cheers for the link.

Heres another, makes very interesting reading on the radiators in our surfs.

I'll be removing and checking mine next week, fitting a new water pump and stat then hill testing to see if I am still getting the same readings when the engine is under load.

http://www.toyotasurf.asn.au/forum/v...er=asc&start=0