mrwibble
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| posted on 13/5/11 at 06:53 PM |
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pinch bolt torque?
sierra uprights. pinch bolt on the machined ring supplied by bgh geartech. seems alot of play, torqued to 70 nm, and still the ring can move. should i
just bung a washer in?
also might it worth a longer bolt and nyloc for iva friendliness?
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britishtrident
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| posted on 13/5/11 at 07:22 PM |
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Has it run of thread on the bolt, Pull the bolt out and check the thread length, as a good bit more than 50% of the effective length of the bolt
has to be threaded for clamp to work.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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jollygreengiant
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| posted on 13/5/11 at 07:27 PM |
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The neck of the hub is meant to clamp around the stub on the bottom of the damper. The blade is only there to clamped between the two faces so that it
should prevent the damper coming out of the hub during unexpected extreme loads. So the moral is, keep tightening until there is NO play. Intially you
will be tightening to pull the split circle together to clamp against the bottom of the damper.
Also make sure that (if using a shouldered bolt) the threads run up the bolt to the shoulder and the length of the shoulder is NOT longer than the
depth of the blind hole, otherwise you could just be getting to the bottom of the threads and not pulling the clamp together.
As said I would be tempted to use a longer bolt and a lock nut for secrity after tightening.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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mrwibble
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| posted on 13/5/11 at 07:56 PM |
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B T i think this answers your question
JGG
i thought that was the case, just worried about snapping the bolt, i think the max for an m12 8.8 is about 90nm, and i wasn't far off that with
loads of slack to go... will pulling the split circle together not increase the torque untill its completely clamped and is this where i'm going
wrong?
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tomgregory2000
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| posted on 13/5/11 at 08:15 PM |
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Might be a stuped question
BUT
Are you fitting the bolt from the correct side?
The upright hole is threaded on one half and just a hole on the other side and the bolt fits from the hole through to the threaded side.
I know its a basic question, but always check the basics before going any further.
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mrwibble
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| posted on 13/5/11 at 08:31 PM |
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hmmmm good question...
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avagolen
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| posted on 14/5/11 at 08:10 AM |
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Hi mrwibble,
The haynes manual gives a torque setting of 57 to 68 lbf ft for the hub carrier to strut pinch bolt.
Len.
The Answer for everything, but never the last word....
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mrwibble
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| posted on 14/5/11 at 12:17 PM |
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thank you avogolen. I was being very stupid in not realising only one side was threaded, which of course it would have to be, or else you'd
destroy the thread...
thanks for help 
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tomgregory2000
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| posted on 14/5/11 at 08:29 PM |
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its good to check the basics before going any further
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