I remember a few months ago someone was having oil pressure problems that they couldn't find the source. I think in a 1030. Anyway I have an engine that was brought to me with the same problem. It's not a Case but could be relevant to any engine. I was suspicious of bad housing bores and sure enough that is the problem. Caps have shrunk and or block has shifted. In the pics the dial bore gauge should be on zero.
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8577.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8578.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8579.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8580.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8581.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8577.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8578.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8579.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8580.jpg"/>
<image src="http://forums.yesterdaystractors.com/photos/mvphoto8581.jpg"/>