Oil Pressure

[Garnet]

"So if a filter is installed with excessive axial pressure which distorts the pleats then strength is compromised and the excessive revs with cold thick oil senario is more likely to collapse the filter."

I like that theory the best.

[Kurt in S.A.]

The big O ring came out square and touch extruded so I'd obviously got the canister depth measurements wrong and subsequently went back to using the cover gasket.

Sounds about right to me. The o-ring should be distorted...excessive extrusion wouldn't be good though.

So if a filter is installed with excessive axial pressure which distorts the pleats then strength is compromised and the excessive revs with cold thick oil senario is more likely to collapse the filter.

Shouldn't the filter construction prevent axial pressure distorting the pleats ?

I would think it would take a lot to distort the length-wise dimension of the filter given the center tube. I would even think that the pressure required to do that would require so much force on the bolts holding the cover down that they would strip out first.

Kurt in S.A.

[barryh]

I would think it would take a lot to distort the length-wise dimension of the filter given the center tube.

I agree that should be the case ... if the filter was properly constructed.

On the other hand if the end caps are not a tightly secured to the filter tube and are able to slide on axial pressure. The bonded rubber end rings these days don't have much give in them to absorb movement.