SOHC.co.uk Forums > CB350/400
Engine rebuild questions
Nurse Julie:
The copper washers can be annealed if they are solid copper. Mine were copper covered steel so I reused them. 8 'O' rings needed for total overhaul of oil pump, I sell the kits if you need one. (Obviously you don't have to buy a kit from me, if you don't want to !!!!)
MrDavo:
My CB750 tacho drive oil seal was leaking, rock hard with age and stuck.
Following advice from this forum, I think, I drilled a tiny hole in it and screwed in a small self tapper. That was to give me the purchase to pull the bugger out with pliers, IIRC what actually happened was that when the self tapper bottomed out in the blind hole, continuing to screw it forced the seal off its seat and out towards me - it was then lobsided but I got a small screwdriver in behind it and popped it out.
I've seen far worse than your cam bearings in sweet running engines, if it ain't (that) broken don't fix it.
Ive scraped carbon off valves plenty of times, just stay away from damaging the seating surface and stems. I've even cleaned them up with emery cloth and a blunt screwdriver end after putting them in a drill chuck, protecting the stem with a bit of rag, probably not best practice but it has worked for me.
Greg65:
How is it that such a small part can cause so much grief. Going for the Julie 87 bit removal process I’ve managed to remove the front third of the seal, still welded. Applied penetrating oil and tried flexing the seal by applying pressure with a screw driver between the tacho drive and the cam cover to push it out. Got some movement so thought I would pull using the pliers. WRONG.... I now have a broken shaft, oh for f#&%£ sake. Any one got a used one for sale? Finally removed the remains.
Yes Julie would love a set of seals for the oil pump, thanks, PM sent.
My wife casually mentioned that a friend of hers husband rebuilds old car engines and has a small engineering business. So after an introduction I’m visiting a workshop with measuring devices that I do not posses next week with a selection of parts. This hopefully will give me a good idea on the condition of the bores and general condition of the engine my inexperienced eye does not have.
I now have a nice set of clean valves which are in good condition. The shafts all measure well within limits, showing little or no wear. Thanks for all the advice.
Nurse Julie:
I may have a spare shaft, I will go in the workshop and look after I have cooked dinner.
Nurse Julie:
I think you may have had the original Oil seal fitted Greg, a metal band encased in rubber, like this one
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No point crying over spilt milk, it just so happens I am giving away a replacement with every CB400 oil pump O ring kit this month......limited supply, last one left ;D ;D ;D
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