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Scuderia

What causes ZF Transmission to milkshake?

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Hey all,

 

 

Was wondering, is the stock ZF transmission cooler the culprit for causing the ZF to milkshake (the image below)? Is it because the coolant and transmission fluid run through this heat exchanger, and as it breaks down this is where to 2 fluids mix causing it to milkshake?

 

If so, would it better to change the stock transmission cooler every 80,000kms with another genuine one? Or install a PWR heat exchanger? Cost isn't a problem but which would be better in the long run?

 

Cheers

 

FO5R297A095AC.jpg?1544077133

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13 minutes ago, Scuderia said:

Is it because the coolant and transmission fluid run through this heat exchanger, and as it breaks down this is where to 2 fluids mix causing it to milkshake

Exactly... the small bit of metal between the two fluids can rust due to the coolant running through it (mostly) and this causes the oil on the other side to mix into the coolant and vice-versa... it's a bit expensive failure of both the gearbox and engine cooling system at once.

 

it is better to remove the stock heat exchanger entirely but you can change it every 50k km's (conservative compared to your 80k estimate, but both "should" be fine...) and still avoid this problem.

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Stray currents, old coolant, vibration.  Mine is rubber mounted. 

Edited by arronm

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yes, stray currents can cause coolant to speed up it's wearing away at the surface, so can stray oxygen (but there should be very little of that) and vibrations just cause the minor damage done to speed up marginally... But I doubt that vibrations would ever cause it on their own, either for stray current...

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