SOHC.co.uk Forums > CB350/400

Cylinder Head Washers

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Drew400:
Just a thought for the experts to reflect on...

What is the purpose of those cylinder head washers vis-a-vis oil? If a little oil seeps through from there, presumably it enters the rocker area. Assuming the rocker cover gasket is good, any excess oil can then only escape via the breather tubing.

I guess the copper expands at a different rate from the surrounding metal to either stop or allow leaks, whichever is preferable.

Is that correct? I will enjoy learning how wrong I am from the replies to come (and maybe they'll also help your thinking, Andy).

Cheers, D.

andut:
I try not to think to often Drew, it usually costs me time & money !

I'll reuse the steel washers with a smear of Hylomar as per Ken's guidance and renew the two Dowty seals and keep an eye out for leaks when I get it back together !

mike the bike:
The purpose of the copper washers is that they seal better than steel ones.   Because they're a softer metal they deform to the same shape as the head.   When reusing copper washers, you're supposed to anneal them by heating them to cherry red and quenching them.  This makes them soft again.

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