Defoaming Additive 2

[TangoCleveland]

We're using Dexron III to lubricate a herringbone gear. We're getting a lot of bubbles in the oil. Is there an additive to remove the bubbles from our 40 gpm circulating lube system?

 

[sciguyjim]

Contact Dow Corning for info about their antifoaming agents. Some info can be found here:

http://www.dowcorning.com/content/publishedlit/25-290A-97.pdf?

 

[romke]

are you sure you need a defoaming agent? From what you write there is not so much foaming as more air inclusion. The first phenomenon (foaming) can be likened to what you see on the top of a good glass of lager, the second is more like the bubbles you see in a coke...

Standard defoaming agents decrease the tendency to foaming, but at the same time decrease the airrelease properties. Use of an agent therefore might make matters worse.

I suggest you check the following:

oil level (may be way to high), temperature (airrelease increases with temperature), settling time.

A defoaming agent should only be used as a last resort...and Dexron III types of fluid usually contain already more then enough.

 

[roczhang]

Be careful to add any defoamant to your system,Most of the foaming problems is relative to the operation mistake, usually the lubricant is carefully balanced with varitey of additives including defoaming additive,I suggest you to do the follows:
1. Check the oil level ,if it is too high or too low
2. Check the oil cleanliness , if it is contaminated by dust ,grease or some anti corrision agent..etc.
3. Check the oil return line if it is a circulating system, check if the oil return line mouth is above the oil level

Try another better quality oil if you are sure everything is in good order , Be sure to Flush the system throughly before oil changing.

 

[NCD13]

Another information.
Even 1 ppm of silicone will degrade anti foam property. Be careful when applying gasket compound (if it is silicone mixture).
Hope this helps