SOHC.co.uk Forums > CB350/400

oil leak below barrels

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billdn:
Not withstanding my cylinder head troubles, my main ride also 400/4, has developed an oil leak below the barrels on the near side front-it seemed to appear after I used an oil flush when doing an oil change. It's not gushing out but weeps slowly and I now have a well oiled left boot. It then runs over the crankcase as the heat and wind disperses it. The big question is it an engine out job ? There is no loss in compression and starts and runs fine, unfortunately the scrutineer at Brands Hatch didn't like it so I couldn't take part in a VJMC parade☹ which is what motivates me to get it done. As far as I'm aware the engines never been out,40 year old nuts and bolts fills me with dread.

Bryanj:
Y remove the head and barrels on a 400 in the frame but first you need to clean it all off and find exactly where the leak is from

ka-ja:
It could be running down the cyl. head studs via the head nuts/washers, and showing up at the bottom of the cylinders, but as already said can be done in situ.

billdn:
Any pointers Ka Ja that might give a clue as to what to look for on cylinder head bolts -I'm guessing perished rubber washers, seals etc.

ka-ja:
Original washers were copper coated steel except for the ones fitted under the long head nuts which accept the cover bolts, these had a built in rubber? seal, all the washers were single use only, I use sealant on the washers as new ones are scarce

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