Rings the things
I’ve had my Ducati 900SS from new so it has very few unknown horrors. Oil is weeping from both cylinders at the rear of each head/ cylinder joint (no head gaskets on these). Less than 10,000 miles ago the engine was properly stripped and rebuilt by specialists to address the common oil galley plug issue. Also, new pistons and rings were fitted and the heads were re-torqued after running in.
All appeared fine until a few hundred miles ago. Now following a thorough clean of both barrels I’m now at least 99 per cent certain oil is weeping from the highpressure oil feed route at the head to barrel mating faces. But how might a brand new O-ring fail if properly seated in place and not disturbed in any way? Wayne Harvey, emai
Jonathan Sewell says: If it’s not a Viton seal, but a generic rubber O-ring, it will fail after a while through exposure to heat. And it’s always a good idea to lap the heads to the barrels too, much like lapping in a valve. This gives the surfaces a much better chance to seal.
Vital to use Viton seals not generic O-rings