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We're all familiar with the two recommended torques for tightening Commando cylinder head bolts. And it's always possible to hear that there are still leaks here and there.
What if there was a third one just like the one in the attached file? What do you all think about it?
This 3rd example is how I…
This 3rd example is how I have always torqued down cylinder heads on my Dommies.
After making sure that the pushrod ends are all correctly located with the cylinder head just softly pinched down, I then go round the various nuts and bolts in increments of 5 ft.lbs until my torque wrench shows they are all at the recommended settings.
I check the settings once more at 10, 100 and 500 miles.
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Head tension.
Always torque the cylinder head on TDC to ensure the valve springs aren't absorbing the clamping torque. More importantly when re-torquing the head as the engine will never stop on TDC.
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That TDC thing is a new one…
That TDC thing is a new one on me.
I guess it comes down to whether or not the spring force is significant, in comparison to the clamping force of the fasteners.
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Absent some radical…
Absent some radical alterations to the cams, I think you will find that at least one cylinder will have both valves open at TDC.
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I can't imagine...
... that they went to all this trouble at Bracebridge Street or even Plumstead!
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