Topic: tourque values

[Mantree]

I am getting ready to change some engine cover gaskets and will be swapping out the screws for socket heads.  I have been told that tourque doesn't matter but it is a aluminium block and I would hate to strip a bolt hole.  Dose anyone have the tourque values for the engine bolts?

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[Deltarider]

What bike?
With only a few exceptions my policy is to use the original screws/bolts as much as possible as they offer the correct alloy to prevent erosion/electrolysis. Torque values are specified in the first few pages of the various Honda Shop Manuals that can be found here: http://forums.sohc4.net/index.php/topic,17788.0.html. I use my torque wrench only where really needed. For the rest I do it by feel and, by doing so, I preserve my skill.

[PeWe]

Engine covers are fastened with M6. Max torque for the std grade screw is 12Nm which is too much for aluminium.
I have tightened my covers with 10Nm. Thread lenght is an important detail too. I prefer min 10mm. If only 5mm the torque can't be over 5Nm.
I have lately reduced to around 5Nm with a 1 hour later re-torque when gasket has compressed. It's too easy to strip the threads. No leaks.
Convert Nm -Ft lbs  https://www.convertunits.com/from/N+m/to/ft+lb

[Mantree]

What bike?
With only a few exceptions my policy is to use the original screws/bolts as much as possible as they offer the correct alloy to prevent erosion/electrolisis. Torque values are specified in the first few pages of the various Honda Shop Manuals that can be found here: http://forums.sohc4.net/index.php/topic,17788.0.html. I use my torque wrench only where really needed. For the rest I use my skill and, by doing so, preserve it.

It is a 75 cb750k and there are 2 bolts that haven't been destroyed by somebody who was in the engine before me. 

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[Mantree]

Engine covers are fastened with M6. Max torque for the std grade screw is 12Nm which is too much for aluminium.
I have tightened my covers with 10Nm. Thread lenght is an important detail too. I prefer min 10mm. If only 5mm the torque can't be over 5Nm.
I have lately reduced to around 5Nm with a 1 hour later re-torque when gasket has compressed. It's too easy to strip the threads. No leaks.
Convert Nm -Ft lbs  https://www.convertunits.com/from/N+m/to/ft+lb

Thanks I guess I will calibrate my tourqu wrench after work today (it's been about a year since it was last used) and my next day off I'll start wrenching.

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[ekpent]

 For the engine covers and valve cover bolts etc. you should be fine if you just go by 'feel' and not going at it with a big torque wrench.  You can go back and re-check after the gasket has settled in. Use some anti-seize if your using stainless fasteners.

[seanbarney41]

Do you have a 1/4" drive torque wrench?  If no, don't try it with a big one.

[PeWe]

I use a small torque wrench for these small things, 2.5-25Nm. 1/4” sockets. It cannot be a long one.

I have another for the head, clutch etc. 10-60Nm.

Cam towers need the small that will not tight too much.

[540nova]

If you use any kind of lubricant,  whether it's oil, anti-seize, or whatever,  throw the listed torque specs out the window.  Torque specs are for dry fasteners,  which is a bad idea,  especially if using stainless steel bolts and screws.

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[Deltarider]

If you use any kind of lubricant,  whether it's oil, anti-seize, or whatever,  throw the listed torque specs out the window.  Torque specs are for dry fasteners,  which is a bad idea,  especially if using stainless steel bolts and screws.

I've read this often and I wonder what the theory is behind this.

[bryanj]

Galvanitic, electrolitic or whatever itic you care causes corrosion between different metals and stainless is worse than BZP.
The difference between wet and dry torque is well documented.

[PeWe]

I use lightly oiled cyl studs and oil under nuts when tighten head. All other dry.
Cam bolts with blue loctite and tighten it hard with a 10mm  wrench. That small tool will reduce the power.

[Deltarider]

Galvanitic, electrolitic or whatever itic you care causes corrosion between different metals and stainless is worse than BZP.

Excuse my ignorance, Bryan, but what does 'itic' mean and what is 'BZP'?

The difference between wet and dry torque is well documented.

Ah..., I hope can find it.

I use ... oil under nuts when tighten head.

I remember that Honda The Netherlands advised this practice after being confronted with mounting complaints concerning CB500s sweating oil near the headgasket. That's why I asked what the theory is behind this, because it seems to contradict what 540nova stated or?... I'd like to learn more on this.

[bryanj]

Bright Zinc Plated and the galvanitic is very basicaly a battery where one metal corrodes passing electrons to the other.

[Mantree]

So what I am getting is anti-seize and hand tight with a short ratchet

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[awrawr]

Be careful. A long time ago I had several stock bolts on rocker cover of my 400/4 shear whilst undoing them. The galvanic corrosion had virtually welded them in place. I learned how to use helicoil inserts pdq. But on a couple of the holes the damage i did extracting the remains meant going up to m8 which wasn't ideal. (I was clumsier then and didnt have many of the right tools.)

[calj737]

So what I am getting is anti-seize and hand tight with a short ratchet

Exactly.

[Deltarider]

It's dead easy: just stop right before it snaps. 

[bryanj]

Decades ago as a marine engineer i asked the 2nd how tight he wanted the 3/8 nuts and bolts i was doing up. He said "till they snap and back half a turn"--------he was really pissed when that is what i did.