Sealed bearing in crankcase

[farmerchad]

Building a clone 660, can you use high quality sealed bearings in crankcase with oil seals also? Thanks for any help

 

[ammoaddict]

Building a clone 660, can you use high quality sealed bearings in crankcase with oil seals also? Thanks for any help

I have wondered that as well. I would be more inclined to remove the inner seal so the bearing could get some oil and leave the outer bearing seal and the crank seal in place.

 

[buzz sawyer]

One bearing model I've seen is the same bearing used on Delco Alternators for years. Some were sealed on both sides and some had a cover that held grease. In both cases, the bearings never received any lube during use - for thousands of miles. RPMs would be close to some chainsaw speeds.

 

[farmerchad]

My biggest worry was the heat. Sealed bearings can withstand 250 degrees but I’m not sure how hot it actually gets inside case I wouldn’t think it would be that hot though. Thanks for all the in put first saw I’ve built from ground up will take any advice I can get.

 

[ammoaddict]

One bearing model I've seen is the same bearing used on Delco Alternators for years. Some were sealed on both sides and some had a cover that held grease. In both cases, the bearings never received any lube during use - for thousands of miles. RPMs would be close to some chainsaw speeds.

I do maintenance in a textile plant. There are sealed bearings in some of them that have been running for years, 24 hours a day, mostly skf. Although most are not running at chainsaw speeds.

 

[torch]

I don't think the bearing seals are designed to handle vacuum/pressure pulses. But they might prevent adequate lubrication from reaching the seal that is designed for that purpose.

 

[buzz sawyer]

I don't think the bearing seals are designed to handle vacuum/pressure pulses. But they might prevent adequate lubrication from reaching the seal that is designed for that purpose.

Good thought, I hadn't considered the V&P pulses. Pretty easy to pop out the seals to eliminate the question.

 

[ammoaddict]

I don't think the bearing seals are designed to handle vacuum/pressure pulses. But they might prevent adequate lubrication from reaching the seal that is designed for that purpose.

Makes perfect sense.

 

[farmerchad]

Thanks guys for all the advice. I’m going to just pop inside seals out and see how it goes from there.