Don65Stang
Well-known member
This is from my 5.0 engine...helping my son with the rebuild. I've rebuilt a few engines but I don't know how to tell what happened inside looking at the wear marks, etc. Car has 91k miles and the engine has never been apart - until now. The 5.0 has forged pistons & a roller cam.
We pulled it to replace the oil pump due to low oil pressure and do a general engine & bay cleaning/detail.
Pulled off the oil pan. Not all gunked up inside. All cylinder walls still had good visible cross hatch patterns. I decided to pull the rod and Main Bearing Caps just to inspect. I was very surprised to see really bad wear marks and copper!
So what do these wear patterns mean? Pics start at the First Main Bearing and work toward the rear.
Front (1st) Main Cap Bearing pics below...
1st & 5th Rod Cap Bearing...
2nd Main Cap Bearing pics below...
2nd & 6th Rod Cap Bearing...
3rd Main Cap Bearing pics below...Note the wear marks on the side. Normal?
3rd & 7th Rod Cap Bearing...
4th Main Cap Bearing pics below...
4th & 8th Rod Cap Bearing...
Rear Main Cap Bearing pics below...
Here are a few pics of all of them side by side (except the Main Bearings that are still under the crank in the block). I tried to label them.
Please help me figure out what is going on to cause these wear patterns. Thanks.
.
We pulled it to replace the oil pump due to low oil pressure and do a general engine & bay cleaning/detail.
Pulled off the oil pan. Not all gunked up inside. All cylinder walls still had good visible cross hatch patterns. I decided to pull the rod and Main Bearing Caps just to inspect. I was very surprised to see really bad wear marks and copper!
So what do these wear patterns mean? Pics start at the First Main Bearing and work toward the rear.
Front (1st) Main Cap Bearing pics below...
1st & 5th Rod Cap Bearing...
2nd Main Cap Bearing pics below...
2nd & 6th Rod Cap Bearing...
3rd Main Cap Bearing pics below...Note the wear marks on the side. Normal?
3rd & 7th Rod Cap Bearing...
4th Main Cap Bearing pics below...
4th & 8th Rod Cap Bearing...
Rear Main Cap Bearing pics below...
Here are a few pics of all of them side by side (except the Main Bearings that are still under the crank in the block). I tried to label them.
Please help me figure out what is going on to cause these wear patterns. Thanks.
.