Drilling Crank bearing Lube holes?
- Thread starter Diggin25
- Start date
Gordy
Well-Known Member
There's not really a need.
Chainlube
Well-Known Member
Are you talking about crank end bearings, already open to the mixed fuel on the rod side. Or, the big end, already has holes in it.
I don't. Adding holes to the outer race will just lead to failure, and they would need to be there if you planned to drill the case into the area the bearings reside. On bearings that come with the holes in them, they are drilled before any of the shaping and polishing work is done to prevent the balls from catching. They get plenty of oil as is anyway. A good quality bearing should last for a few thousand miles on one of these engines without issue.
Of more benefit to bearing life would be to make sure the case and lower components are all extremely clean, with no metal debris of any kind. Metal particulates are the number one cause of ball and needle bearing failures by a wide margin. I always pull my new engines apart and make sure they are clean during reassembly, and I will also pull the engine, remove the top end, and flush the bottom end out with mineral spirits after break-in. Excessive? Maybe, but it does remove all of the debris left behind during said break-in.
Of more benefit to bearing life would be to make sure the case and lower components are all extremely clean, with no metal debris of any kind. Metal particulates are the number one cause of ball and needle bearing failures by a wide margin. I always pull my new engines apart and make sure they are clean during reassembly, and I will also pull the engine, remove the top end, and flush the bottom end out with mineral spirits after break-in. Excessive? Maybe, but it does remove all of the debris left behind during said break-in.
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