Scrivet wrote:I am wondering what the purpose or need is for one in that location. It is on the "dirty air" side of the filter at that point.
One could only believe the engineers determined the air quality directly in the air flow path created by the cooling fan was poor, so air with less particulate matter is drawn from above the hood.
The air cleaner gasket surface forms a better seal than metal to metal contact could achieve preventing fan driven dirt from entering the system, which would require a higher maintenance frequency of the oil cup, which is only 10 hours or less as it is.
If a "loose" gasket was used, you can rest assured it would eventually drop out and possibly never replaced.
If the gasket surface was permanently applied at Donaldson, technically no gasket exists except on the manufacturing blueprints, leading to a debate as to why no gasket illustration or mention exists in the IHC service or parts manuals.