Diesel in the oil

[jonathanhsm]

stuck valve

thanks David - that sounds about right - all I can say is that there was a lot of diesel in the oil - and my father in law who knows about these thngs said the unburnt diesel would be seeping past the rings into the sump.-I was confused because the oil level kept going up and there was no (milky) sign of water in the oil.

 

[vyv_cox]

no compression, with a stuck open valve, or combustion with a closed one unburnt, some remains in cylinder, gets forced or goes down bores, past rings , into sump.

I'm struggling with this explanation. If the scraper rings prevent oil from passing up the piston, why don't they prevent diesel from going down? And how does diesel lie on top of a piston in a running engine? With an open exhaust valve I would have expected most of the fuel to be blown straight out, producing vast clouds of white smoke.

It seems to me that there is more to this than we know.

 

[jonathanhsm]

stuck valve

well I definitely had clouds of white smoke - but presumably there was some left behind that seeped down because diesel oil has lesser viscosity than engine oil - I am starting an RYA marine diesel course tomorrow so I'll ask the instructor!