Has your ZF milkshaked poll - POST 2012 ONLY

[BFIIGhiaZF6]

Originally Posted by Mercury Bullet

Except we are being told it's safe to operate a transmission at 30°C on the say so of a person who works on a ZF help desk.

If that info came from one of the engineers who designed the box, then I might take notice.

I'll ask again...Why do all manufacturers use heat exchangers?
ZF help desk reckon you don't need one. Rolls Royce think you do. So do Ford.

Look I'm totally behind eliminating the problem (if there is one) but lets get the facts straight and to me a chat with a "ZF tech" doesn't cut it.

Please read this, https://fordforums.com.au/showpost.p...&postcount=216
and thus, http://fordforums.com.au/showpost.ph...&postcount=219

The guy was a ZF tech I assure you, he rang me after I sent an email to ZF.

Not saying that it is ok to run the trans at 30C, only that is its minimum optimum operating temp for fuel efficiency, obviously once warmed up the running temp will be much higher, but wil typically be running 30C cooler without the heat exchanger and with an air/oil cooler installed.

Your trans temp at start up will be similar to the ambient temp, a heat exchanger is designed to heat the trans up as quickly as possible in order to minimise fuel consumption and therefore reduce emissions, that's the reason manufacturers use them, the negative side of this is the risk of "Milkshake" and higher running temps for the trans, up to 105C or more is commonly seen, Ford supply a supplementary air/oil cooler for towing to assist the heat exchanger to cool the trans.

With the heat exchanger removed and the air/oil cooler installed the trans will reach its minimum optimum operating temp of 30C in 2-5 minutes depending on ambient, because it has a designed in strategy to do that, it does not need a heat exchanger to heat it, but it does need a cooler to cool it and it will still run at lower temps within the normal operating temp range, typically 30C cooler than with a heat exchanger installed and with no risk of a "Milkshake"

Just trying to let people know that the option of the air/oil cooler is not going to impact negatively on the ZF6.

Anyone can email ZF and ask the question.

My trans is running on average at 45C - 65C, done a lot of monitoring here, https://fordforums.com.au/showthread.php?t=11441275 if your interested

Regards, George