main rod bearing question

[bayliner09]

hi i bought main and rod bearing for my aq120b motor i went to put them in today and noticed that the rod bearing all have on the top 1/4 inch scraches on them i did the finger nail test and could feel slite grab but i ran my nail up and down a bit and the grab turned to really nothing but i can see the scraches in them is there something i can polish them with to make sure there are no burrs on them or what do you sugest:facepalm:

 

[bayliner09]

Re: main rod bearing question

any one out there have any advice about my problem

 

[woppini]

Re: main rod bearing question

Just get some new bearings.. Maybe they were previously installed?

 

[shortreed6]

Re: main rod bearing question

If you try to polish them you run the risk of changing the clearance that's been designed into the bearing. Clearances are set up for the oil to create a film for the metal components to run on and to allow for themral expansion of the metal. I have to agree with woppini. Get a new set of bearings. I'd also advise using plastigauge to be sure you have the clearance you require for the rod to crank shaft clearance before you do your final assembly torques.