This video shows the rebuild of my 1938 BMW R51 500 cc boxer engine. I posted the first half of this video a few months ago. This is the full video. I am just an enthusiast - not a mechanic. But I hope some of you find it useful!
Thanks for sharing this information! It's always a pleasure to learn something new every day. To see the internals of this engine was fascinating and it's amazing that you brought this bike back to life once again...Not to forget it's already 84 years old! I'd love to work on an older BMW, but I'm happy with my current 70's BMW R60/5. project. Regards Andreas
Excellent video with professional narration. Sorry to turn this into a Q&A but you closed the timing cover without showing alignment of the timing marks on the gears. I am timing my 1939 engine and wondered. Do the marks on the crank and cam gears align in the centre? Thanks for any guidance.
Hello Old Flanker, I have a photo with the chain on where the marks on the cam wheels are right next to each other, at 9 o'clock and 3 o'clock, and the crank mark (out of pic) presumably at the top. I'd just check that the cam lobes work sensibly at that setting, and I think you'll be OK! Just take care to not let the chain slip a tooth while adjusting tension with the dynamo. I did that when the front cover was on, after an issue with the dynamo. It ran, but like a dog till I fixed it!
I am curious how the timing chain oilier could cause the crank to bind unless it's pulling one side tight. I have the exact same issue with mine and assumed it was case warpage from being welded in the past. If no line boring is needed then your shim idea might actually solve it since it would bind only after installing the oiler.
hi, It's so interested,...I have a complete engine, but now i' going to build the same as yours ..R51 1938...if i've got some problem, can i ask you to help me....
