SOHC.co.uk Forums > CB500/550

Bottom cases dowel pins in when already put together?

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robvangulik:
Those dowels are there to make sure the top and bottom cases are perfectly lined up, because especially the crank bearings are measured with thousands of an inch (or mm), so what do you think happens when you screw those cases together without dowels?

McCabe-Thiele (Ted):
I hate to say it but you need to split the crankcase and fit them before you tighten up the crankcase bolts.

alexdecker:
That's what I feared. I am a little in doubt though, as I seem to remember when putting it together, that there were dowel pins holding it together. I am a little uncertain as to how many dowel pins are actually in the crank cases. The holes in the crank cases I noticed are in the front and in the back (circled in the picture), and I assume it's part 16 (also circled) that are going in the holes. But are these the only dowels holding the crank cases aligned?

alexdecker:
Only asking as I just put the valve cover on, and the holes for the dowel pins on that one looks a lot like the holes I circled in the crank case part diagram.

Pangloss:
Those dowel holes are External and NOT used.!  They are used in the case manufacturing process only .

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