Oil in Turbo/Intercooler fix...Uncle Mike strikes again

The smoking Malawi Defender...this is a great fault diagnosis

First mistake, He has his foot flat on the accelerator like you would with an old tractor engine.

If I closed my eyes and listened I swear I could hear Bob Flemming in the background.

I'm a big fan of his videos. Didn't know the servo failure could cause raised crank case pressures

payydg said:

I'm a big fan of his videos. Didn't know the servo failure could cause raised crank case pressures

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+1 for Mike's videos...he's hugely knowledgeable and a good all round egg with great down to earth presentation skills. Interestingly, this was one of the faults on my Ninety when I was diagnosing the engine troubles back in 2019. I should add, one of many...which led me to a complete engine rebuild and refurb'. Land Rovers have a terrible habit of one failure point leading to another, to another and another Mike's videos and, ultimately, his tuition has enabled me to thoroughly complete the rebuild and I'm sure it's the same for other Land Rover owners worldwide

payydg said:

I'm a big fan of his videos. Didn't know the servo failure could cause raised crank case pressures

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Nor did I

I must be honest, I didn't fully understand it all. I'll have to watch it again.

mick the builder said:

I must be honest, I didn't fully understand it all. I'll have to watch it again.

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my very basic understanding was the vacuum pump is sucking in air into the crank case via a hole in the servo. That increases pressure which has to be equalised via the cyclone breather which then carries or ‘blows’ oil from the rocker into the air filter which gets carried into the engine and. Runt off = smoking oil burning engine

Sounds right to me.

payydg said:

my very basic understanding was the vacuum pump is sucking in air into the crank case via a hole in the servo. That increases pressure which has to be equalised via the cyclone breather which then carries or ‘blows’ oil from the rocker into the air filter which gets carried into the engine and. Runt off = smoking oil burning engine

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+1 This. Some engines, especially diesel engines are prone to this when they've been poorly maintained+component age failure...and there are many Landy engines that are heavily used and abused with near no proper maintenance. My engine developed a number of faults due to maintenance/component age/use...over head pressurisation leading to over oiled/tired turbo and oil cooler failure into the radiator The engine was of semi-unknown heritage that had not been properly looked after, even though there was very little exhaust smoke and only some smoke on occasional overrun and started/stopped did all the things an old 200tdi engine should do.

I remember MKII Golf engines used to suffer from head gasket failure due to head over pressurisation where the oil breather system would readily clog up and very few owners would clean out there breather systems every few years.

On the 200tdi rebuild I've changed the cyclone to an Alisport unit and will soon add a drainable catch tank to engine - this to ensure cleaner diesel burn and to stop pumping unspent hydrocarbons into air intake :. much cleaner exhaust gases + zero risk of over pressurisation. I've looked at the cyclone design, it's a crap layout and is too small...LR should have simply fitted a cyclone with larger chamber ensuring lower head pressure and freer oil vapour flow.

payydg said:

my very basic understanding was the vacuum pump is sucking in air into the crank case via a hole in the servo. That increases pressure which has to be equalised via the cyclone breather which then carries or ‘blows’ oil from the rocker into the air filter which gets carried into the engine and. Runt off = smoking oil burning engine

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So if the servo was air tight, there would be a permanent suction but as a Sealed system within the engine. The hole in the servo is allowing air to constantly sucked in rather like blowing up a balloon. This extra air pushes out through the rocker cover etc etc.?

Hi Mike, yes this + with a Land Rover engine the design has the additional vacuum pump, add this to the std engine pressure txfr from block to head + blocked up cylone/pipes = over pressurisation...and over time + with no maintenance = a very poorly head area, tired turbo et al. Add to this an aged oil cooler/radiator = oil+coolant mix into both engine oil and coolant system/galleys. This is what it looks like in a 200tdi engine...my old engine




Only saving grace is that the engine now looks like this



eta, the over pressure tries to push out through the rocker cover, sometimes seen as an oil leak through the rocker cover gasket...but more often just picks up high oil content out through the cyclone directly into the air intake and ultimately the turbo and i/c system [this as per Britannica Mike's videos]. It makes a huge mess of everything