Caliper bolt torque for V50 (F05) |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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Posted: 18 Dec 2017 at 15:15 |
I've decided to rebuild the calipers with new seals as there was a suspicion of a leak on one. Anyone have the torque figure for the clamp bolts that hold the 2 halves of the caliper together? They were pretty tight.....
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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manual says 2.5 to 2.9 Kgm for calliper bodies
Which works out about 18ft lb and what you expect for an M8 bolt into alloy without a helicoil. Was it tight because of corrosion or Locktight ? Caviate is that I always check as the measurements in the book are sometimes out !
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Never used a torque wrench for that, fairly tight with the appropriate allen key.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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V7Chris
Senior Member Joined: 13 May 2017 Location: Powys Status: Offline Points: 1882 |
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I think you use 'the force' Brian to sense the appropriate torque to apply - finger tight, medium tight or FT (you can guess). I do take the common sense approach most of the time, but in the offshore oil and gas industry and similar safety critical industries (nuclear) you simply won't get away with that, they even have data logging air/hydraulic torque wrenches now in use that record the actual progressive torque applied when tightening flange bolts. I take the view that if it is safety related and there is a torque setting, I use it. That way, no one can ever say in the coroners court 'this accident happened because the flegelspegel bolt was over/under tightened...etc' trouble is, not everyone will have your experience to know what 'tight enough' with an appropriate alen key is.
Edited by V7Chris - 18 Dec 2017 at 17:55 |
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David Owen
Falcone Joined: 08 Oct 2017 Location: The Algarve Status: Offline Points: 49 |
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You checked on thisoldtractor.com, right? I found the whole dang workshop manual for mine there. And it's free! Free, I tells ya!
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Simmoto
Senior Member Joined: 29 Jul 2017 Location: Aberdeenshire Status: Offline Points: 261 |
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I'm with Brian on this one. Torque values have....value IF you trust the published torque figures. My view of the Guzzi values in handbooks is that some are way high and you stand a very real chance of stripping threads if you blindly follow them.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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There are four tightness settings,
Finger tight Medium tight Very tight and Til you fart tight. The latter is usually too much. But if you can find the torque settings and have a known accurate torque wrench, use it.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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The existing bolts actually had copaslip on them. I must say I loathe that stuff - it gets everywhere and looks horrible. If I really need an anti-seize compound I use something like this:
but usually I find a thin smear of ordinary HMP grease does the trick. I'm normally in Brian's camp (of course he omitted the final one - tighten till it strips then half a turn back - but have not worked on this type of caliper before so needed some guidance. The ones that came out were definitely more than 18 ft-lb. I understand new ones come with the caliper rebuild kits. |
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Dennis menace
Senior Member Joined: 04 Jul 2016 Location: Farnsfield Status: Offline Points: 221 |
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The bolts on mine were very tight but it was obviously corrosion due to the mismatch of metals. They 'gave' all of a sudden with a loud snapping sound and a shower of powder. I replaced my bolts with stainless and used a little copperslip. I tightened them by 'feel' and not too tight and they held perfectly. The mating surfaces are good and substantial so no need to 'grunt up' the bolts.
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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Yeah, I tend to just go with touchy feely myself. And copperslip.
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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Cant think of a reason not to use a torque gauge and setting if you have the setting
Cant think of a reason not to use a torque gauge and setting if you don't have as they are easy enough to find. There are tables correlating what bolt in what material and if that fails or you want to check, lots of manuals out there that will tell you what a similar bolt in a similar materials torque setting is. On calliper clams while the ultimate torque is important; getting the bolts to apply even pressure is of equal or more importance. As the bolts were corroded into the clams I may just run a tap through to clean the threads off, Locktite will work as a good lubricant before it sets (rather than copperslip)so an equal torque setting should be good enough. to get equal pressure (the actual seal is via a captive o ring). If you really wanted to be 100% certain then stage tighten, finishing of with a angle gauge to match would work best. On the other hand brakes are not important feature so a good guess will be fine, whats the worst that can happen.... If they fail you can use your gears or drag you feet to slow :-) |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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...... One advantage of the linked brake system is that I will have adequate stopping power even if one system fails completely...... |
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Never had that problem. - |
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"Chicken nuggets don't dance on a Tuesday."
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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It can't have been you that slathered it on my V50 then.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Oo no I don't slather.
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"Chicken nuggets don't dance on a Tuesday."
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