I don't think I am explaining it well. The timing cover requires massive amounts of sealant. Some of that sealant can either break off and float around in there or be forced over passages when the cover is installed. All of the oil that goes into the car enters and passes through that big open area and those passages. It would not take a whole lot of sealant to block a passage enough to reduce flow and pressure on an engine that already has fairly low flow and pressure. The video I linked explains this concern very well even if he doesn't specify sealant and just refers to "gunk".
Is it because it is just to easy an explanation that people are convinced there must be something else and they are on a quest for a more complex mystery cause? Sometimes the easy explanation is right. I have followed these failures for 5 years and based on the info at hand this explanation just makes sense.
http://www.ft86club.com/forums/showt...ne#post3054764 Post 22
http://www.ft86club.com/forums/showt...45#post2210345 Post 158
https://www.ft86club.com/forums/showthread.php?t=107959
http://www.ft86club.com/forums/showthread.php?t=121863
https://www.ft86club.com/forums/show...51#post2825351 Post 133