986 vs 987 oil return tubes

[Gilles]

Maytag,

I believe that the main reason to change them is to improve the removal of air (and foam) from the oil before it drains down to the oil pan, so the pick-up screen gets only oil without air bubbles...

Not sure if my explanation makes sense...

[maytag]

Originally Posted by Gilles

Maytag,



I believe that the main reason to change them is to improve the removal of air (and foam) from the oil before it drains down to the oil pan, so the pick-up screen gets only oil without air bubbles...



Not sure if my explanation makes sense...

Your explanation makes sense, but it seems to me that the 986 unit would be BETTER at removing air and foam. There are some threads on other forums where the 986 return tubes are actually referred to as a "secondary air/oil separator". I can see how this may be the case, as air could rise while oil drops.
I don't know.
It seems that shooting all the oil against the side of the motor (as the 997 unit appears to do) may indeed serve to remove air, as the oil runs down into the pan.

I dunno.

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