Created by InShot:inshotapp.page.link/YTShare Rebuilding the BSA Bantam D7 Crankshaft using my home-made press and alignment tools. Please like and subscribe if you enjoy the video. Thanks for watching! retromeccanica.video@gmail.com
Love watching your videos Very interesting I have often forgotten to press the record button when I have been filming our RU-vid channel DST racing projects
@@retromechanicalengineer Yes indeed. You are right. His generation was the best of British. Their values and sacrifice were thrown away by the selfish idiots that followed afterwards. Thinking about the scoring on the flywheel, do you think that if you could swing that in your lathe, building up with tig weld and machining back would be an option? Those BSA service sheets take me back. He gave you those because he knew one day you would use them.
Nice job Dean, you are right on in your thoughts, a couple wedges will do the trick, have had to wedge several, you just dont have the fine control with the press, right at the last moment it will alway move more than you want. This is more common than you think. Super video my friend, keep them coming.
Another great vid and thanks for taking the time to explain all the fine details. Things got a little hairy on the press, but I'm glad you were able to balance it out. After watching you do that, it's absolutely nuts to imagine that the same process was done on a manual arbor press! Hard as nails is an understatement. The condition of those service sheets is incredible, it's hard to believe they came from your grandfather but what a treasure! I'm sure there are some good memories there. As always, keep up the great work! I enjoy watching your work and learning more about new things. I definitely agree that you qualify as a proper RU-vidr. Looking forward to the next video!
Hey there. I've just recently discovered your site. So how did you ensure you did not press the two halves too far towards each other and in doing so reduced the side to side movement of the conrod too much. I assume there is a need for slight , few thousandths side to side clearance of the rod between the halves.
The pin is shouldered. You must press the halves together until the shoulders are in contact. BSA did not provide any means of adjustment for rod shake, and never specified a dimension as this was effectively set by the shoulder. There are no thrust washers like those fitted to a modern two stroke crank. Best wishes, Dean.
Thank you, very interesting, I am getting to this stage now, I have a couple of crankshafts both the same, one being in better condition but both have conrod scores, can I ask if both the flywheels on one crankshaft are identical, if so I can make one good one from the two.
The timing side flywheel and spindle is a different part number to the drive side. I can't remember if the flywheels themselves are the same. You might be able to press the spindles out and swap them over. It's a case of measuring them up and seeing what you can do. Best wishes, Dean.
@@retromechanicalengineer thank you, yes the shafts themselves will have to be pressed out, I can't see any issues re lining up the primary side sprocket, don't think that, just the cam, the flywheels as far as I can see are identical, but will run a mic over them to be sure, great vid, thank you again.
@@philtulk9180 no problem at all. As you say, the only thing you need to be accurate with really is the timing side if you are going to run points again. I use electronic ignition and don't run with a Woodruff key so it makes no difference. Best wishes, Dean.
@@bsasteve I wouldn't count on it. The BSA service sheet illustrates an Arbor press for doing the job, but I have to say that it took a bit of force to crack the pin in mine. If you have one available it wouldn't hurt to try but if you are buying one, I'd go for a bit more capacity. Good luck with your rebuild, Dean.
