Done a bit more investigating with the engine running. I know it's not definitive but taking off various pipes the pressure seems to be in the rocker cover. ie the air seems to blow out of there not into there. If I take the filler cap off the air seems to be coming from the push rod side. I...

I think I'l try running it till the rings bed in and see what happens.

Valve clearances are fine all checked out. It seemed to happen fairly suddenly in the winter. Could it be valve stems leaking exhaust or compression back up. That said it's fairly constant pressure not particularly pulsing with each stroke.

There was slight ridge about 10mm down the bore.I used a 3 stone hone but to be honest the wear seemed that small that i only honed it to allow the rings to bed in. My real issue is that despite thinking cracked piston of warn/missing rings causing the pressurisation the situation remains the...

Ok it's actually blowing out the filler cap, it sort of hovers if i twist it off and leave it over the filler. If I remove the breather pipe from the swirler it blows out there. It is looks smoky but I thinks its not smoke but vapourised oil. Assuming that cross hatch is where the gaps are then...

I honed the bores, and replaced the rings. What's gapping the rings?

Hi Folks, I'm new here and need some help. Over the winter my defender started to consume a lot of oil. I traced the fault to the breather system, it was pressurizing and the oil was going through the air intake. I have since taken the engine to bits replaced the piston rings, head gasket. But...