SOHC.co.uk Forums > CB500/550

550k3 oil seals

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bigmockuk:
Had to strip the head off the 550k3 a few times for one reason or another and found each time that the oil seals between the barrel and head are flattened and compressed,first of all is there somewhere that does these seals without the need to buy a whole engine gasket set? and secondly is it possible (or has anyone done it) that instead of using oil seals that it would be possible to drill n fit dowels instead?   
im thinking it should be possible to have tight fitting dowels which would allow the oil to pass up into the head without the chance of oil getting sucked past the seals into 1 or 4 cylinders?

Oddjob:
Those seals are meant to compress or there would be oil everywhere. Have they ever leaked? 

bigmockuk:
thanks for getting back so quick,no1 cylinder smokes more than the others,when engine heats up and the others stop smoking no1 still smokes on acceleration,stripped the head off today,all pistons are dry except no1,the crown has a misting of oil on it,dont think its the valve guide seal as done not that long ago,new rings fitted too so im thinking oil is getting sucked past the seal,i dont like how these seals flatten the way they do but understand why

Trigger:
Smoking can be a few things.
Piston to bore clearance is out of spec.
Damaged or worn oil ring.
Valve guides are worn and beyond spec.

bigmockuk:
i had to replace the inlet valve guide and valve on no1 cylinder when i first got the bike due to lots of sideaway movement! it just seemed to always be no1 smoking tho, i could try checking the barrel for any warpage? i had to skim the head a while back due to this,im toying with the idea of drilling the barrel and head oilways to fit small pipes to replace the need for seals i think it can be done if i can find the correct diameter pipe

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