SOHC.co.uk Forums > CB350/400

Cylinder stud too short!!

<< < (5/7) > >>

Nurse Julie:

--- Quote from: orcadian on February 19, 2018, 04:06:31 PM ---yes, parts list indicates 122mm but that is the overall length, not the distance above the case when fitted.  Not sure if you can wind them out with the barrels on but worth a careful try.  Your studs are already the right way up so initial length must be suspect.

If you back it out a few threads don’t tell Trig.  I would investigate further before bodging is even contemplated.


Just a thought - there isn’t another thick washer stuck to the head is there?


--- End quote ---
If the studs have only recently been inserted, they shouldn't be corroded in, which is a good start.
I had a copper covered steel washer stuck when I took mine apart, It took me no end of picking to get the blighter out, it was well stuck in there.
Yes, don't tell Trig anything. He would have it all apart again by now to see what the problem is  :'( :'(

Orcade-Ian:
Just checked the barrel height and it’s 67.4 mm plus a gasket at about half a mm means that you should have 100 - 68 or about 32 mm sticking up above your barrels.  Didn’t get to put the barrels on the case - too many bikes in the way!

Ian

Fogdevil:
The dowel is straight but the stud is 'not quite vertical'.However, once the cylinder head is on there is no problem and it is very easy to get it on.

There is no washer lodged anywhere but the offending stud is 5mm shorter than its equivalent.

I will tentatively try the double nut method(I only thought of using a stud extractor which would have caused damage) and if there is any sign of success I will take the stud out, measure it and then replace with new.

I suppose the double nut method can be reversed to tighten studs up and a torque wrench used on the upper nut if needed?

Just measured the stud heights above the barrel 28.4mm and 23.6mm

Nurse Julie:
So it's the wrong length stud, what a pain but easily sortable. Yes, you can double nut to get a stud tightened up again. Well done, you got there in the end.

K2-K6:
As I understand it the studs shouldn't be torqued into the cases (please correct if anyone has proof to the contrary)  it looks like Honda put them in with semipermanent/heatresistant/never-come off-till-you're-dead, thread lock, which is why they are Sooooo very hard to get out.

My view would be they should all be thread locked to avoid them backing out in service.

Navigation

[0] Message Index

[#] Next page

[*] Previous page