If it's a spun bearing, the damage is done and starting it to check oil pressure won't matter. It may even give us a clue as to what happened. The worst that can happen is she'll lock up. The image of the oil line is the transmission fluid cooler line inlet. The return line is straight below that one, right next to the lower radiator hose. Has nothing to do with the engine noise.

Main and rod bearings have tabs that hold the bearings in place. The bearings don't move when the engine is running, the crankshaft and rod journals turn inside them. The bearings keep the proper clearance between the crankshaft and the bearings. The bearings do not contact the journals, there is a "cushion" of oil between the bearings and the journals. If a bearing comes in direct contact with the journal, the engine will knock. If there is insufficient oil between the bearing and the journal, the bearing will seize to the crankshaft journal, and it will spin with the crankshaft as it rotates. Main bearings spin in the block or main bearing caps, and rod bearings spin in the connecting rod or rod cap. Hence the term, "spun a bearing".

 

Well that is sad news to hear but now I just gotta consider my options. I am figuring this is going to be an expensive repair that I cannot afford, especaially after just doing the fuel pump not long ago.

I had an oil change about 1500 miles ago, no major oil leaks, is it possible the oil ran too low?

Oil pressure at idle is sitting at the 1/4 way mark.

 

Your oil pressure isn't low enough to cause the problem. Below ~7psi to ~10psi is a problem. Low oil level could easily cause a bearing to spin, but it has be pretty low, or empty. Like I mentioned above, if a bearing has insufficient oil, it can spin. Could be low on oil, could be a restricted oil passage in the crankshaft, could be a clogged oil pick up screen, etc etc. Really need to have it diagnosed and figure out what happened. Who knows, might not even be a bad bearing, might be something else, hard to tell for sure on Youtube.

 

Thanks for your help I appreciate it. I am going to have a mechanic take a look and go from there.

 

That sounds like the same sound I had when the bearings spun in my '97 blazer. When I pulled the engine apart the bearings were mangled. It had sat for awhile with anti-freeze in the oil and when I finally towed it to the shop I told them to put in a new engine. My job at the time didn't allow me the time to do the work myself. The mechanic thought he could salvage the engine and flushed the heck out of it with gallons of oil. I drove it about 100 miles when it lost power and died (actually my wife was driving it home from work). When I got to the truck I started it and had the same sound if I remember correctly. But there is the chance that your issue is completely different.

 

I decide I am going to take a loss on this one and throw it up on Craigslist today and look for another blazer. This time maybe I can find a nice 4wd 4door the 2dr was a little tight in the back.