SOHC.co.uk Forums > CB350/400

oil leak below barrels

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ka-ja:
I suspect that solid copper washers under the head nuts have been fitted after previous engine work, as the part number for F1 and F2 appears to be the same, maybe something to do with not mixing too many different metals all with different expansion rates

Dave487:
I did buy a couple of new ones from DS because 2 were badly scored and I'm pretty sure they were copper. Anyway Julie if they're copper and in good condition then anneal them if they're steel just use them again. Replace the Dowty seals of course.

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