Head

[Jay K.]

Trying to remove left side head. (Broken exhaust stud - long, sad story)
BMW’s tool to lock TDC conflicts with the airbox, which doesn’t come out.
What am I missing?!? There must be a trick?

[Jay K.]

I put in the longest M8 bolt I could get by the airbox but the crank isn’t exactly locked. “…shouldn’t move the slightest bit” as the Clymer manual says. With the M8 in place it will rotate about 4 teeth on the flywheel.
Thoughts?

[Buzzz]

What Bike? R1100S? R1200S ?
What tool do you use? 11 5 640?

[Jay K.]

No, I think it is 11-2-650. It’s supposed to go thru a hole in the trans and thru a hole in the flywheel. But, like I said, the airbox is in the way.

[surfdad1060]

Have someone sit on the bike in top gear and stand on the brake.I'm assumingthis is to get the allen screw that holds the cam sprocket on. Its a beast your going to want a hardened allen wrench. Don't forget to put a wire the through the timing chain and the sprocket

[tomvv11]

+1 on having a well-fitting Allen wrench you can put some torque onto. I rounded out one of those M8s disassembling and it was nerve-wracking to drill and EZ-Out the bolt.
If you DO happen to eff it up, I bought two bolts at the time and only needed one.
I wouldn't worry too much about the flywheel moving a couple teeth. If it holds steady enough for you to break the bolt loose, stop there then get it back to TDC and continue loosening the cam bolt.

[JimMoore]

Originally Posted by Jay K.

No, I think it is 11-2-650. It’s supposed to go thru a hole in the trans and thru a hole in the flywheel. But, like I said, the airbox is in the way.

The R1100S is put together a little differently than the rest of the oilhead family. I'm a little surprised the tool didn't fit, but there you go. I have used an allen key with success before.