mink_man Posted November 14, 2017 Report Share Posted November 14, 2017 Ordered my rebuild parts for my 2005 250cc sherco last night from splatshop and im trying to think ahead of which way im putting back together. Ive done engines in the past where i didnt need a crank pulling tool to get the crank back in. Has anyone got a tried and tested method to get the crank back in safley without damaging something? Mink_man Quote Link to comment Share on other sites More sharing options...
mrturtle Posted November 14, 2017 Report Share Posted November 14, 2017 Bearings/crank in the freezer, warm crankcase evenly with hot air gun. drop the bearings inti case make sure they are seated. warm the bearings/casings with hot air gun again and fit the crank and then the other casing. may need a small tap on either side of the crank when the casings come together and then recheck casing bolt torques. works for me everytime 3 Quote Link to comment Share on other sites More sharing options...
mink_man Posted November 14, 2017 Author Report Share Posted November 14, 2017 2 hours ago, mrturtle said: Bearings/crank in the freezer, warm crankcase evenly with hot air gun. drop the bearings inti case make sure they are seated. warm the bearings/casings with hot air gun again and fit the crank and then the other casing. may need a small tap on either side of the crank when the casings come together and then recheck casing bolt torques. works for me everytime Thanks MrTurtle, a great help. What torque setting did you use? Quote Link to comment Share on other sites More sharing options...
mrturtle Posted November 14, 2017 Report Share Posted November 14, 2017 m6 bolt torque into aluminium is usually around 7-10 Nm depending on application. 8Nm is what i used in a star pattern. If you heat up the crankcase enough you will find the main bearings drop into the case and fully seat with no other force. when you have done this heat the bearing in the case and get it hot enough so you can put the frozen crank in the same way without force. Just make sure you have the conrod in the correct place! heat the other main bearing/ case just before you close up the halves and it should go together with no drama. Once you have them together with bolts in snug, tap either side of the crank with deadblow or hyde mallet etc until it turns freely then torque the bolts and check the crank rotates nice and free. HTH jason 1 Quote Link to comment Share on other sites More sharing options...
mink_man Posted November 14, 2017 Author Report Share Posted November 14, 2017 3 hours ago, mrturtle said: m6 bolt torque into aluminium is usually around 7-10 Nm depending on application. 8Nm is what i used in a star pattern. If you heat up the crankcase enough you will find the main bearings drop into the case and fully seat with no other force. when you have done this heat the bearing in the case and get it hot enough so you can put the frozen crank in the same way without force. Just make sure you have the conrod in the correct place! heat the other main bearing/ case just before you close up the halves and it should go together with no drama. Once you have them together with bolts in snug, tap either side of the crank with deadblow or hyde mallet etc until it turns freely then torque the bolts and check the crank rotates nice and free. HTH jason Thanks for this again Jason,i should recieve the parts in the next few days and hopefully ill have the crank back by then! fingers crossed this weekend ill have it together again! Quote Link to comment Share on other sites More sharing options...
copemech Posted November 16, 2017 Report Share Posted November 16, 2017 On 11/14/2017 at 2:54 PM, mink_man said: Thanks for this again Jason,i should recieve the parts in the next few days and hopefully ill have the crank back by then! fingers crossed this weekend ill have it together again! I hope you ordered the VITON seals! Quote Link to comment Share on other sites More sharing options...
mink_man Posted November 16, 2017 Author Report Share Posted November 16, 2017 7 hours ago, copemech said: I hope you ordered the VITON seals! Yes,yes i did Sitting by the door at work waiting for the postman (or woman). Quote Link to comment Share on other sites More sharing options...
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