SOHC.co.uk Forums > CB350/400
Cylinder stud too short!!
Fogdevil:
You're right Julie.
I think it needs an engineers touch.
Having seen the state of your pistons and cylinder head ,yet the bike still functioned ,made me wonder if a little problem like mine would have been coped with by Honda engineering.
Better safe now than costing lots of money later
Nurse Julie:
I think Honda engineering can put up with an awful lot but only if the correct parts are fitted in the correct places. What I have learnt recently is that Honda didn't fit certain parts for fun, they were put there for a reason. Some of the items fitted, in this cast the copper or copper covered steel washers are what contributes to making these engines so resilient but the parts need to be in the correct place, to the correct spec for optimum resilience and performance. I have learnt something this morning, I never knew the head studs were different on the F1 to the F2, I thought they were the same sizes on both models.
Fogdevil:
I know I have read somewhere that the early F1's had a minor oil leak problem on some bikes.
Honda increased the length of some studs(couldn't tell you which ones) by 1mm to cure the problem.
However, if this info is inaccurate I am sure someone on here will inform me.
I would hate to start an 'urban myth'.
K2-K6:
Picking up on Julie's post about how they could be correct length but short when installed.
If they are different on each end (ie one end to set the depth into the case, one for the nut) then it's possible the "wrong ones" could be upside down, and so will allow them to go in too far.
Honda, along with any decent engineers, are very particular about studs and their loading. General practice would be that a stud should never hit the bottom of the hole it's in. They'd normally be arranged so that the top part of the thread restricts them going too far.
The true torque loading only comes onto the whole assembly once you tighten the last nut, making them kind of "free floating" in engineering concept terms.
If anyone has a set out of the cases it maybe helpful to look at them to see if the differ each end.
Nurse Julie:
--- Quote from: K2-K6 on February 19, 2018, 12:44:45 PM ---Picking up on Julie's post about how they could be correct length but short when installed.
If they are different on each end (ie one end to set the depth into the case, one for the nut) then it's possible the "wrong ones" could be upside down, and so will allow them to go in too far.
Honda, along with any decent engineers, are very particular about studs and their loading. General practice would be that a stud should never hit the bottom of the hole it's in. They'd normally be arranged so that the top part of the thread restricts them going too far.
The true torque loading only comes onto the whole assembly once you tighten the last nut, making them kind of "free floating" in engineering concept terms.
If anyone has a set out of the cases it maybe helpful to look at them to see if the differ each end.
--- End quote ---
I was just talking to Trig about this and he suggested the stud may have been put in upside down, thus not leaving enough thread at the top for the nut to engage.
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