Actually when changing the outside washers I did do one at a timer ,read here somewhere it was ok to do that.
Actually I think my Haynes manual stated ok to do it that way also. I have retorqued head twice since approx 100 miles after. I did add a lil light weight oil to the threads when replacing the
washers to all 8 head bolts. Im pretty sure I loosened and retightened each bolt in the proper sequence.Should I have not loosened each bolt
before each retorque?
Is the Torque wrench OK ? --- If it is 100 miles in total more can be needed
I have seen a loosening sequence I Believe it was an Oilpan for a Honda 929 Fireblade
And is seen online
https://www.yourmechanic.com/article/how-to-remove-cylinder-head-bolts-by-spencer-clayton
Warning: Cylinder head bolts have a
specific sequence that is used when removing them. Consult the manufacturer's specifications for the proper removal sequence for the engine being worked on.
This being ( old XS 650 ) most likely it is more stiff less optimized ..so Given the Experience here at the forum
Perhaps even in a service instruction.
It would work most likely.. . Loosening and oil on threads seems right. Service manuals often have that in the Work description and is good practice in most cases.
But differs between manufacturers orders.
But the phenomenon Exists and I think it would be better to follow the more careful ways to do it if possible -- to be on the safe side
and have it as a practice . The Airplane Boys should have seen it.
If the machine is old and have warped or scratched surfaces .a bit of Liquid Gasket and extra care tightening and loosening can help.
So
So.... when you start you have 8 tight nuts and you remove just one. Does that cause any warpage or other problems with the head? Nope, it doesn't.
Can instead be
So.... when you start you have 8 tight nuts and you Dont remove just one. You loosen them step by step in the same manner as you do Tightening them
I have worked with Excavators and Pipelines .. When a leak ... The first step was always to Tighten the Coupling / Flange ( Newer loosening ) .In most cases the leak then stops.
If it don't stop then next step is considered. Often these were under pressure so loosening is not a good idea.
I don't know the design rules for the head bolts but I would assume over tightening is avoidable in the sense that some Margin is there