Dingo55 Posted January 15, 2021 Share Posted January 15, 2021 Hi Appreciate any help/advice Been waiting for my new valve /head clean to come back from machine shop ( burnt valve r/h cylinder 99r1100rt) A week back I rolled the bike forward about 3ft in neutral, back on centre stand Piston still at TDC, cam chain seemed to be as it was unbolted Locking pin still in place Just checked and I now cannot see any timing marks through the port hole What have I done??? Help Cheers Mark Link to comment
Doctare Posted January 15, 2021 Share Posted January 15, 2021 I'm no expert and i didn't sleep at a Motel 6 last night. My guess is that the drive train and clutch had enough bind to nudge the flywheel jut a bit. I would take a large flat screwdriver and see it I could move the flywheel a little through the starter hole. I'm not recommending this for you But I can get gorilla at time and I would. It's slower and more careful than putting it in high gear and turning the rear wheel by hand. If that is too much you can pull the transmission off and get a good look at the flywheel marks etc. I'm sure someone smarter on this post will have a better idea. Link to comment
dirtrider Posted January 15, 2021 Share Posted January 15, 2021 5 hours ago, Dingo55 said: Hi Appreciate any help/advice Been waiting for my new valve /head clean to come back from machine shop ( burnt valve r/h cylinder 99r1100rt) A week back I rolled the bike forward about 3ft in neutral, back on centre stand Piston still at TDC, cam chain seemed to be as it was unbolted Locking pin still in place Just checked and I now cannot see any timing marks through the port hole What have I done??? Help Cheers Mark Morning Mark Are the pistons STILL at TDC??? This is the important part. Was it (verified) at the TDC (mark) through the timing hole when you pinned it? If it was properly pinned then it didn't move. If pistons are still at TDC & it is properly pinned then look in the timing hole again with a better light. Link to comment
Dingo55 Posted January 15, 2021 Author Share Posted January 15, 2021 Thanks for all replies Checked again this morning down on hands and knees I can see the marks on the very top side of the window if I look up at a very steep angle Certainly not near the centre of the window as normal Does this mean that the pin wasn't locked in properly? Is it ok to turn that amount back? Appreciate the help Cheers Mark Link to comment
dirtrider Posted January 16, 2021 Share Posted January 16, 2021 12 hours ago, Dingo55 said: Thanks for all replies Checked again this morning down on hands and knees I can see the marks on the very top side of the window if I look up at a very steep angle Certainly not near the centre of the window as normal Does this mean that the pin wasn't locked in properly? Is it ok to turn that amount back? Appreciate the help Cheers Morning Mark Sounds like engine isn't/wasn't locked with a proper sized locking pin. Yes, you can carefully turn it back just be careful of the loose chains. Link to comment
Dingo55 Posted January 17, 2021 Author Share Posted January 17, 2021 Thanks DR Yeah locking pin is not the bmw item so possibly part of the problem although I have used it previously without incident Do we know the diameter of the bmw pin? Thanks again Cheers Mark Link to comment
Dingo55 Posted January 17, 2021 Author Share Posted January 17, 2021 Hi Would anyone care to comment on the pic below The markings at the 7 position suggest to me that this item has been used previously although sold as a $300 new part Thanks for the opinions/help Cheers Mark Link to comment
dirtrider Posted January 17, 2021 Share Posted January 17, 2021 9 hours ago, Dingo55 said: Thanks DR Yeah locking pin is not the bmw item so possibly part of the problem although I have used it previously without incident Do we know the diameter of the bmw pin? Thanks again Cheers Mark Morning Mark The CORRECT locking tool isn't just a straight rod, it is multi-dimensional (stepped). It really isn't worth making the complex BMW tool for a one-time usage. Most just use an 8mm or 5/16" rod, or an allen wrench, to lock the engine from turning more than a couple of degrees, then manually roll the engine within the locking tool's play to align the TDC mark for final assembly. If you have a lathe, have the round stock, have precise measuring tools, & have the time I can send you a drawing on the proper tool but as mentioned above that is a LOT of machine work for a one time use tool. Link to comment
Dingo55 Posted January 21, 2021 Author Share Posted January 21, 2021 Morning Dr Thanks again I've previously used my homemade pin with no problem Moving the bike whilst in pieces was a first so I'll be careful not to do that again Thanks for the offer Almost ready to begin reassembly The rocker arm adjustment looks a bit daunting at the minute Cheers Mark Link to comment
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