SOHC.co.uk Forums > CB750

Rewiring K2 with later high beam switch

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Bryanj:
Do I remember there being an "O" ring in that area?

the-chauffeur:
Oh yeah - the big one that goes round the oil path dowel.  Both are there - and were new when I put the two halves together last time.

I'm struggling to remember now, but I have a feeling that when I put the bottom half on, I had some trouble with one of the bearing retainers not fitting quite right.  I replaced all of the bearings with SKF's and had to have retaining grooves cut into the sides of a couple of them - and one in particular was a very tight fit.  Anyways, I thought I'd got the cases squared away but hadn't, and had to reopen them - and I guess I disturbed the liquid gasket stuff.

Whatever - it's going to be hard work.  Again.

>-sigh-<

mick:
Keep plugging away Neil it will be worth it in the end  ;), cheers Mick.

UK Pete:
That engine is giving you so much hassle, i hope you get it oil tight and running fine, maybee if its up and running you can join us at box hill on August 28th, where hopefully a few sohc members will meet up
Pete

the-chauffeur:

Well, it's been a day of ups and downs.

We pulled the engine earlier today, flipped it and opened it up.  It was fairly obvious where the sealant was missing - there was a space about an inch wide, which is very weird, but hey.  We cleaned the mating faces before applying new sealant and with all that done and the halves bolted back together, we flipped the engine right way up.  Everything checked out (gears and crank-wise) and we're just moving it back to the bike when . . .

 . . . we noticed what looked like a small silver plug that had fallen out of the cases.  On closer inspection (and some hunting with a torch) it appears to be the internal end covering of one of the cylinder studs - I can see the top of one if I look very carefully. The piece of casting is only about the size of a 20p piece and it's a couple of mm thick; there's no thread on it, but it's got a domed indent in the centre. We didn't touch the studs this time - no need.  All we were doing was taking the bottom case off and putting it back on - so I can only assume the end cap had fractured when I replaced the standard studs with heavy duty ones and it been waiting for the right time to fall off . . . and that time happened to be now. 

I can't see any other case damage anywhere, and it's certainly not spread or cracked anything else, but what I'm hoping someone can tell me is whether it's safe to run as it is - insofar as will the rough casting hold up to being continually splashed with engine oil?  I know the cases are strong enough as they are, but I'm just a little concerned that the unfinished surface left by the missing cap might be too porous and/or should be resealed to stop it crumbling. 

I'm praying that it'll be fine as it is, and that I'm just me being over cautious - I really don't want to go through an entire stripdown again. 

>sigh<->again>

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