marred/scratched main bearing
Thread Starter
Le Mans Master
Joined: Oct 2000
Posts: 6,209
Likes: 33
From: Texas-out west
marred/scratched main bearing
how much can you have before must replace... new bearing with 2 scratchs 1/4 " in from each side of bearing and it runs from start of "U" to end of "U", can feel slightly with fingernail, no idea how it got there, torqued down main to check with plasti gage and upon removing bearing there they were
thoughts on this. rest are great with no problems
thoughts on this. rest are great with no problems
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
The bearing is line with a soft material so if it does not stick up (ridges from the scratch) you are probably fine. The crank journals are a different story.....they will need to be totally scratch free.
Instructor
Joined: Aug 2003
Posts: 221
Likes: 8
From: A little place called Macungie PA
Errr
I'm not sure about the time and money you have into this project or how much you plan on putting into this project but any scratch in the bearing surface is a good location for problems to begin.
As you and many others on this board know the moving parts of our engines ride on a thin layer of oil, this scrtch could and most likely will effect the oil film. Also since you state that you can feel the scratch chances are the areas besides the scratch have been raised slightly. If you were to look at that bearing under a mircoscope it would be clear.
It's all about time and money but I would not use the bearing it could cost you more later.
P.S. PM I can show you a picture from our microscope of a "light" scratch from a roller bearing.
As you and many others on this board know the moving parts of our engines ride on a thin layer of oil, this scrtch could and most likely will effect the oil film. Also since you state that you can feel the scratch chances are the areas besides the scratch have been raised slightly. If you were to look at that bearing under a mircoscope it would be clear.
It's all about time and money but I would not use the bearing it could cost you more later.
P.S. PM I can show you a picture from our microscope of a "light" scratch from a roller bearing.
Last edited by SKF engineer; Sep 12, 2007 at 09:14 AM.
Le Mans Master
Joined: Aug 2001
Posts: 8,145
Likes: 1
From: Bradenton FLORIDA
I'm not sure about the time and money you have into this project or how much you plan on putting into this project but any scratch in the bearing surface is a good location for problems to begin.
As you and many others on this board know the moving parts of our engines ride on a thin layer of oil, this scrtch could and most likely will effect the oil film. Also since you state that you can feel the scratch chances are the areas besides the scratch have been raised slightly. If you were to look at that bearing under a mircoscope it would be clear.
It's all about time and money but I would not use the bearing it could cost you more later.
P.S. PM I can show you a picture from our microscope of a "light" scratch from a roller bearing.
As you and many others on this board know the moving parts of our engines ride on a thin layer of oil, this scrtch could and most likely will effect the oil film. Also since you state that you can feel the scratch chances are the areas besides the scratch have been raised slightly. If you were to look at that bearing under a mircoscope it would be clear.
It's all about time and money but I would not use the bearing it could cost you more later.
P.S. PM I can show you a picture from our microscope of a "light" scratch from a roller bearing.
