Oj, so I got my newly rebuilt Polaris 250 Trail Boss crank/rod/bearings unit back from being rebuilt. So, what is the best way to put the case back together? Crank in the freezer with the case in the oven? Should I use a press? Any advice?

 

YEP! best to have the bearings on the crank and in the freezer,have two blocks of wood under the left case half, heat the bearing area with a propane torch for about 5 minutes or so,place the crank immediately into the left case half and the bearings should just slip down flush.Let it cool down a little and use Three Bond 1194 or Yama Bond liberally around the left case. Have some thick gloves and heat the right side case half around the bearing area. Install the right side case and tighten the bolts to about 12 foot pounds.. IF the crank is a little hard to turn,just lightly tap each side of the crank with a dead blow hammer and then should spin freely.Then after the case has cooled a little, grease the inside of the seal lips and install the crank seals. OPT

 

Cool! Thank you. Ok sorry for the dumb question. By left side, do you mean the small side where the dual bearings on the crank go? Mot the magneto side right?

 

Yes,the clutch side of the case where the double bearings go. OPT

 

Great! I got the case back together today!!! Thank you