Post by 90GTVert on Jan 7, 2011 7:41:03 GMT -5
This information was provided by 190mech.
OK its fixed,Put it in V blocks and it was sooo far out I went ahead and started hammering before I took measurements.After the first round I had .22mm,waaay off still;
2 more good sessions with the big chisel and hammer got it to .04mm(GOOD!)
Here are the secret crankshaft adjusting tools;
Warmed up the bearing in the small case half with my antique Wanger heat gun till the grease started smoking,then dropped the crank in;
Slathered some Ultra Gray silicone on the little half and heated the bearing in the big half,more smoke,slid the halves together and got the bolts snugged down;
Here is a side by side of a Mina(top) and the Kymco crank,not as much extra length on the drive side as I thought...
I think a bearing got cocked during the press installation and thats when the crank got squeezed.It takes very little force to squeeze or spread a crank(takes a heck of a lot for twist!),only some light raps with the hammer on the chisel each session was enough to bring it back.Even big motorcycle cranks are this way,thats why I say to treat a crank verrry carefully!
homepage.ntlworld.com/david.gibbison/v-tec/Files/Alphacrankreconditioning.pdf
OK its fixed,Put it in V blocks and it was sooo far out I went ahead and started hammering before I took measurements.After the first round I had .22mm,waaay off still;
2 more good sessions with the big chisel and hammer got it to .04mm(GOOD!)
Here are the secret crankshaft adjusting tools;
Warmed up the bearing in the small case half with my antique Wanger heat gun till the grease started smoking,then dropped the crank in;
Slathered some Ultra Gray silicone on the little half and heated the bearing in the big half,more smoke,slid the halves together and got the bolts snugged down;
Here is a side by side of a Mina(top) and the Kymco crank,not as much extra length on the drive side as I thought...
I think a bearing got cocked during the press installation and thats when the crank got squeezed.It takes very little force to squeeze or spread a crank(takes a heck of a lot for twist!),only some light raps with the hammer on the chisel each session was enough to bring it back.Even big motorcycle cranks are this way,thats why I say to treat a crank verrry carefully!
homepage.ntlworld.com/david.gibbison/v-tec/Files/Alphacrankreconditioning.pdf