kfrancois Posted January 13, 2006 Share Posted January 13, 2006 Has anyone replaced a Poly alternator belt. If so how did you tension it. The Clymer Manual says there is a BMW tool required. Any help would be appreciated. Link to comment
smiller Posted January 13, 2006 Share Posted January 13, 2006 Many/most around here seem to set the tension with the 'half twist' method (tighten until you can just twist the belt 90 degrees by hand) with good results. Link to comment
Haynes Posted January 13, 2006 Share Posted January 13, 2006 Changing the poly belt requires no special tools. Technically, a belt tensioning tool should be used if you are working to dealer specs but as Seth described, the half-twist method works fine. You'll need a basic set of metric tools. Do a search on the method of changing the belt so you're aware of all the pitfalls. As I always say, if you're concerned about being able to do the job, get someone to assist. Link to comment
russell_bynum Posted January 13, 2006 Share Posted January 13, 2006 Definitely change the belt per the recomended interval. As Seth said, the "twist" method of tensioning the belt works just fine. Link to comment
Little_Brit Posted January 13, 2006 Share Posted January 13, 2006 My 850 (same engine, smaller pistons and sweeter running alternative to an 1100!) was easy. The tension is set by applying the specified torque, 8 Nm, to the lower left handside alternator mounting bolt and then tightening the nut to it's torque setting, 20 Nm, along with the other two nuts and bolts. For once an operation that was as easy as the Haynes manual would like you to think everything is! Good luck Link to comment
Londoncallin Posted January 14, 2006 Share Posted January 14, 2006 Has anyone replaced a Poly alternator belt. If so how did you tension it. The Clymer Manual says there is a BMW tool required. Remove the left alternator mounting nut and replace with two standard nuts tightend together on the stud leaving just enough clearance so that the alterator is still free to move. Apply 8Nm and hold while you tighten the remaning two nuts. Remove jam nuts and replace with the stock nut. Link to comment
kfrancois Posted January 14, 2006 Author Share Posted January 14, 2006 Thanks for your help. I appreciate it. Link to comment
russell_bynum Posted January 14, 2006 Share Posted January 14, 2006 Has anyone replaced a Poly alternator belt. If so how did you tension it. The Clymer Manual says there is a BMW tool required. Remove the left alternator mounting nut and replace with two standard nuts tightend together on the stud leaving just enough clearance so that the alterator is still free to move. Apply 8Nm and hold while you tighten the remaning two nuts. Remove jam nuts and replace with the stock nut. It's been a while, but I seem to recall doing it from the other side using an appropirate size hex bit socket...and maybe an extension. Link to comment
ShovelStrokeEd Posted January 14, 2006 Share Posted January 14, 2006 I just poke the nose of a shorty tire iron up under the bottom of the alternator and, with the nuts just a bit tighter than finger tight, run things up till the belt tension feels right, tighten one nut and check some more, if all is right, tighten the rest and I'm done. Used to be, a set of tire irons came with your tool kit and they are perfect for the job. You airhead guys know what I mean. Link to comment
smiller Posted January 14, 2006 Share Posted January 14, 2006 I just poke the nose of a shorty tire iron up under the bottom of the alternator and, with the nuts just a bit tighter than finger tight, run things up till the belt tension feels right, tighten one nut and check some more, if all is right, tighten the rest and I'm done.Well if we're all coming clean I'll admit that's all I do too. No torque wrenches, no special tools, just a 14mm wrench, a prybar, and a little sense is all it takes. Link to comment
ShovelStrokeEd Posted January 14, 2006 Share Posted January 14, 2006 Errr, 13mm on mine anyway. Link to comment
bmwmick Posted January 15, 2006 Share Posted January 15, 2006 Has anyone replaced a Poly alternator belt. If so how did you tension it. The Clymer Manual says there is a BMW tool required. Any help would be appreciated. Go read this whole thread: http://bmwsporttouring.com/ubbthreads/sh...true#Post378243 Ensure you get the correct Belt for your bike. Poly V-Belt or Elast belt. Mick Link to comment
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