SOHC.co.uk Forums > CB500/550
Rear Damper bottom bolt threads question?
deltarider:
9 of ten issues I have had to address, were caused by standing still and not by riding...
K2-K6:
--- Quote from: deltarider on November 14, 2022, 12:02:39 PM ---I maybe a nut where it concerns bolts, but on disassembly decades ago there must have been something wrong with the original bolts as it's not my habit to bin parts that can be reused. On the contrary: I've made it a sport to reuse as much original parts as possible. To give you an idea: it was not before this last summer, after 46 years and numerous, numerous adjustments, that I've renewed the 8mm lock nuts of the drive chain adjusters when they finally had become all too round.
Clearly I have made the wrong decision to use ordinary bolts which I happened to have at hand.
Why adding a nut would be 'asking for trouble' is not clear to me.
--- End quote ---
Adding a nut shouldn't give a problem really as it's not really under load at all, just stopping the bolt falling out.
The joint is a double shear/clevis and in simplest form just needs a pin to go through it in handling the loads it has to take, same as a chain really.
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You can see the principle load site (illustrated displaced/broken) in picture that the joint has to withstand.
In most shocks though it's been adapted with a shouldered bolt to take load one side, while using the thread on other side. Production/access/assembly reality has given this interpretation that works fine.
The only potential problem if the threads are broken in the koni shock body is if that load capability is now different from the other side which may cause the shock to lean over under load and cause a problem with alignment. If there's no movement in that worn thread area it's not going to give a problem.
McCabe-Thiele (Ted):
A bit miffed today my order of quite a few nuts & bolts have arrived and the ones for the damper bottoms - thread is too fine (1.25) - I'm guessing a coarser bolt has been used in the past.
I could not find the old bolts before I ordered them from Middletons - good stock though for when I fit new dampers.
For now the old units are cleaning up well - judging by the action the dampers only act one way - upwards reistance - none downwards.
Oddjob:
The odd thing is if you bought a set of Koni dampers in the 70-80s the bottom bolt was fully threaded like a set bolt. Still got a set now and they are exactly like that still so it must work.
Mmm must get those out and polish them up, not using them as I'm fitting Marzocchi Strada Piggybacks.
Laverdaroo:
Show off! ;) :D
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