I pass this on for those Seal28-ers still using the Bukh engine. Last season, my DV20 sprang an oil leak from the aft side of the cylinder head gasket. I have found that the leak was due to a stuck breather valve. I didn't know such a thing existed, but you find it underneath the rocker cover. It looks like an inverted funnel with a pipe connecting it to the inlet manifold. The idea is that it scavenges the exhaust gasses that leak past the pistons. It contains a simple one-way valve to stop oil from getting into the inlet manifold. If the valve sticks closed, then pressure builds up inside the engine and voila - oil leaks. You need to unscrew it and wash it out in petrol. Be careful not to lose the tiny oil seal sleeved onto the pipe!

Neil
Neil Sinclair

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