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Teej317 Teej317
3/27/2018 7:21 PM

I'm trying to sweat a main bearing in using an oven and dry ice. Put engine case in oven for about 20 minutes at 275 degrees. Bearing was sandwiched between dry ice for well over an hour. Bearing will not drop in. Tried tapping it a little but will not go. Can't even get it halfway in. I've tried this a couple times now.....what am I doing wrong?

Bike is an 05 RM 250 and the main bearings are OEM.

#TeamSway
SwayMX.com

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eeazye eeazye
3/27/2018 7:34 PM

You need to turn the heat up. I bury the knob on my oven when I’m doing case bearings. It usually hovers around 400 degrees.

Also, you get more bang for your buck with heat vs cooling. You’ll get 2 thousands or better stretch as opposed to maybe a half thousand shrink with cooling. That requires a lot of time in dry ice and quick action when installing.

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Micahdogg Micahdogg
3/27/2018 7:44 PM

Yeah I use $350. Once the case is good and hot, you can hit it with a propane torch for a little extra heat before plopping it in.

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Teej317 Teej317
3/27/2018 8:24 PM

Thanks for the tip.....350 for 20 min worked. A light tap and it dropped in.

#TeamSway
SwayMX.com

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slipdog slipdog
3/30/2018 9:09 AM

I just use a press and none of that is necessary

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