Author Topic: Front Fork Clamp Bolt Torque settings.  (Read 927 times)

Offline McCabe-Thiele (Ted)

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Front Fork Clamp Bolt Torque settings.
« on: August 22, 2024, 10:47:54 PM »
As my rebuild has spanned almost two years with some parts taken off  & put back again more than once I  am doing some basic safety checks before I take the 500 out for a shaked down run.

I'm now having a senior moment when checking the front fork clamping arrangement as the terminology I find confusing.
In the Chassis section the  500F  shows the various Torque settings.

Item 16 front fork bolt (2)  (bolts with O ring seal - fork tubes) - 39.8 - 47.0 ft lbs.
Item 17 Steering stem nut (1) - 57.9 - 86.7 ft lbs.
Item 18 Steering Stem bolt (2) - 21.7 -  28.9 ft lbs  Is this the bottom yoke pinch bolt?
Item 24 Fork Top Bridge bolt (2) - 13.0 - 16.6 ft lbs. Is this the nut and bolt on the top tube clamp?
Item 30 Bottom bridge (2) 21.7 -28.9 ft lds No idea what this is referring to?


There is a pinch bolt on the stem nut - please what is this setting as I can,t see it listed?

Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Bryanj

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Re: Front Fork Clamp Bolt Torque settings.
« Reply #1 on: August 23, 2024, 12:42:50 AM »
The top yoke pinch bolt torque is for when the D washers are fitted and even then is too high, bottom bridge is the lower yoke pinch bolts, i have used a torque wrench on the steering stem nut and this will be different if you have fitted taper rollers which i seem to remember you did in which case it goes tight enough to remove all play, the top you centre pinch bolt is just tight

Offline McCabe-Thiele (Ted)

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Re: Front Fork Clamp Bolt Torque settings.
« Reply #2 on: August 23, 2024, 08:11:49 AM »
Thanks Bryan, as you know I do have taper roller bearings so the nut at the top of the bearings is suitably adjusted - so is there a value for the top chromed nut?

At the moment its just suitably tight as is the pinch bolt that I nipped up afterwards.
« Last Edit: August 23, 2024, 09:56:40 AM by McCabe-Thiele (Ted) »
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Bryanj

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Re: Front Fork Clamp Bolt Torque settings.
« Reply #3 on: August 23, 2024, 01:41:56 PM »
Never looked Ted, i have always done them up by "feel"
Do be careful of the enclosed top steering stem nut as i have read that in some cases there are not many threads to screw on to so not as tight, maybe a turn of ptfe tape or a blob of silicone to act as a type of threadlock

Offline Seabeowner

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Re: Front Fork Clamp Bolt Torque settings.
« Reply #4 on: August 23, 2024, 07:20:16 PM »
Normal Honda Manual confusion:
Item 18 is marked as M10 x 40. (but CMSNL list it as M10 x 35?) So must be the bolts in the bottom yoke.
Item 24 is marked as M8 x 56. So has got to be the bolts through the spacers in the top yoke. But be careful.
Item 30 seems to be a repeat of item 18, the torque values are the same.
And go easy on that top nut, I've never torqued one.
Phil
1971  CB500K0  Candy Jade Green or Candy Gold
1973  CB500K1  Candy Ruby Red
1975  CB550F1   Shiny Orange
1978  CB550K     Excel Black

 

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