Looking to see if anyone has had this problem? I installed an 18 hp Briggs in a Max 11,[ it was a used engine that I picked up], I started the engine and run it for about 2 minutes, just to check belt alignment and everything. As I let the engine sit and idle after checking it all, it seized up. That was about a week ago. When I went to rob a couple of parts from it today, it turns over quite freely. My thoughts are a faulty oil pump, but any other suggestions of what else to check are appreciated. And by the way, Thanks to JPSWIFT I do have another engine to put into it.