SOHC.co.uk Forums > CB500/550
Screw broke off in primary hub
alexdecker:
--- Quote from: McCabe-Thiele (Ted) on April 19, 2022, 04:44:06 PM ---You are having some bad luck with seized stuff Alex - a used item might be cheaper than an engineering shop.
--- End quote ---
Haha, I don’t know if it’s bad luck or normal. Probably also because I am inexperienced and things seem harder the first time around. This broken screw was very much bad luck though!
Oddjob:
I’ll have at look at one of my spares, will check that it will come apart as you don’t want to find out another screw breaks on the replacement.
alexdecker:
--- Quote from: Oddjob on April 19, 2022, 11:21:14 PM ---I’ll have at look at one of my spares, will check that it will come apart as you don’t want to find out another screw breaks on the replacement.
--- End quote ---
That would be much appreciated, thanks! This is all that stands between me and assembling the engine again (I sincerely hope :o )
Oddjob:
It's been many years since I've had to do this job. As such I didn't seem to recall how the primary drive housing came apart.
Can I ask Alex why you took it apart, of tried to take it apart is more descriptive.
The reason I ask is that to replace the primary drive damping rubbers you don't need to remove those 3 screws, they are for access to the starter gear rollers and springs, I'd forgotten that. It's the circlip on the other end which allows access to the damping rubbers.
Anyway, mines apart. Came apart with no problems even after 40 odd years being stuck in a box in a shed with a leaky roof.
alexdecker:
--- Quote from: Oddjob on April 20, 2022, 03:09:30 PM ---It's been many years since I've had to do this job. As such I didn't seem to recall how the primary drive housing came apart.
Can I ask Alex why you took it apart, of tried to take it apart is more descriptive.
The reason I ask is that to replace the primary drive damping rubbers you don't need to remove those 3 screws, they are for access to the starter gear rollers and springs, I'd forgotten that. It's the circlip on the other end which allows access to the damping rubbers.
Anyway, mines apart. Came apart with no problems even after 40 odd years being stuck in a box in a shed with a leaky roof.
--- End quote ---
It was only because the gear comes apart from the hub automatically, and when that happen, one of the three screws in the hub just fell out. I felt like I had to make sure nothing fishy was going on (with only three screws in such a crucial spot in the engine, I figured they better all be tightened down), and then realised it had broken off.
Yesterday I took my handheld drill and went to town on it. I figured I might as well, as I'd either get a new one from you, or buy one. So couldn't hurt to try and mangle my own a little bit. But some great stroke of luck, I managed to hit the center of the screw with a 2mm drill, and drllled through the screw in a straight line! I did the same with larger and larger drills, and after having gone through the hole with a 5mm drill, the remaining of the screw just kind of came out in a small steel spiral. Not believing my luck, I found a new screw and checked the threads, and everything was in order, and I now have a screw free hub, ready for service and three new screws!
So while I really appreciate your offer, it would seem I don't need it anyways! Phew, about time I got some luck with this seized old engine anyways ;D
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