Technical Rocker cover and Oil consumption

[Mike1alike]

I think that the rocker cover might be responsible for the oil consumption in Fiat Punto.
I have my Punto mk2 1.2 8V 2006 since 2015, made about 80.000 km since and it consumes oil, kind of the same amount since I got it. Driving in the city (which I mostly do) I cannot pinpoint the exact amount of oil consumption as there sometimes looks like is no consumption and other times oil is low and needs topping up. On long drives, it's about 0.5-1 litre of oil in 1000 km.

The engine runs very well on mine. There are no oil leaks.
But the inside of the intake manifold is always oily, the MAP sensor is covered in an oil layer and it's like that since when I got it. When I first noticed it I tried to find a fix, but a mechanic told me that he had a Punto that he liked a lot (even put a turbo on it and competed in rally) and that oily inside manifold is "normal behavior" for Punto, that's what it does and it cannot be fixed. So I took his word and let it like that.

Once I cleaned the rocker cover, took it down, washed it, air dried it. And I noticed there is a system on the upper part. I couldn't get that open to see what's inside, that's why I just washed it and dried it. I don't know if it can be taken down (taken apart) without destroying it and then put back together. But I'm thinking that there should be something like a PCV, that should retain the oil inside. The pipe that the breather gets attached to comes from this part. If it can't be taken apart, I'm thinking putting a PCV instead of that plain pipe could do the trick. I don't know what PCV model would be a perfect fit, by the looks of it the PCV VALVE FOR NISSAN 1200 B120 1.2 LITRE 8V A12 - CVV-018 looks like it could fit on mine.

I'm putting photos with the rocker cover model I have and that Nissan PCV valve.

What do you think? How is the inside of intake manifold at yours, oily or dry? How is the oil consumption?

P.S. I have a friend who has the exact model of Punto and he recently performed the piston rings replacement on his engine, mostly due to the oil consumption. After that, he's kind of in the same place with the oil consumption, no much improvements.

 

[George1982]

Oil in throttle body and consequently in intake manifold comes from the smalller part of the breather hose that is attached directly on the plastic manifold.If disconnected,you should never see oil in there.
In Puntos there isn't a PCV valve and the oil fumes get sucked in directly into the intake. I don't know if oil fumes is something normal from the beginning,or it comes after years.Maybe someone who got an engine overhauled may answer you if he got rid of that annoying issue.
I have no oil consumption but i change the oil every 5K kms.
Nevertheless i don't think that putting a pcv valve would ever retain the oil fumes inside(after all there are not threads to bolt a pcv valve onto).
That issue comes from inside,maybe from piston rings.
You should consider implementing the piston soak treatment,check YouTube videos for it.

 

[Mike1alike]

Nevertheless i don't think that putting a pcv valve would ever retain the oil fumes inside(after all there are not threads to bolt a pcv valve onto).

The pipe that the breather hose comes attached to is threaded. So there can be put a PCV valve on, instead of the plain pipe, if I could find one with the exact same thread and a good fit for the hose (pipe diameter). I haven't found one yet and I woud try one that wouldn't be very expensive. Also, one unthreaded PCV valve that could fit inside that pipe should work.

 

[George1982]

I have the 1.2 8v year 2002 ,it isn't threaded.Maybe it's different than yours

 

[Mike1alike]

P.S. I have a friend who has the exact model of Punto and he recently performed the piston rings replacement on his engine, mostly due to the oil consumption. After that, he's kind of in the same place with the oil consumption, no much improvements.

I rechecked with friend. He says that there was oil loss after piston rings replacement, but actually managed to identify that as oil leaks at rocker cover gasket, as he didn't use any sealant at first. He says that he fixed that with sealant and after that, in 3.000 km there is no oil missing. Also, the MAP sensor (and probably all inside of intake manifold) is covered in oil.

So that part is true, the inside of intake manifold getting oily is normal behavior, having the breather connected there without a PCV valve. Even so, there is little amount of oil transferred (or should be little), so no oil consumption on this path.

So, my Punto's engine might need new piston rings. Although, it runs really nice, no engine loss, no high values on gas consumption.

But I'm still wondering about that upper part inside the rocker cover. There is a system, having those high pressure lines that have seals on (the seals comes with the cover gasket on this model), the ones I've marked in the picture and having the pipe that feeds the breather coming out of this area. I marked that pipe with the arrow. So it is possible, I say, that having something gone wrong there to result in oil sputtering through the breather pipe, therefore oil consumption through that pathway. Isn't it?!
Have anyone managed to get a look inside this cover model? Or do you have a scheme of it, a technical drawing?

 

[judderbar]

I rechecked with friend. He says that there was oil loss after piston rings replacement, but actually managed to identify that as oil leaks at rocker cover gasket, as he didn't use any sealant at first. He says that he fixed that with sealant and after that, in 3.000 km there is no oil missing. Also, the MAP sensor (and probably all inside of intake manifold) is covered in oil.

So that part is true, the inside of intake manifold getting oily is normal behavior, having the breather connected there without a PCV valve. Even so, there is little amount of oil transferred (or should be little), so no oil consumption on this path.

So, my Punto's engine might need new piston rings. Although, it runs really nice, no engine loss, no high values on gas consumption.

But I'm still wondering about that upper part inside the rocker cover. There is a system, having those high pressure lines that have seals on (the seals comes with the cover gasket on this model), the ones I've marked in the picture and having the pipe that feeds the breather coming out of this area. I marked that pipe with the arrow. So it is possible, I say, that having something gone wrong there to result in oil sputtering through the breather pipe, therefore oil consumption through that pathway. Isn't it?!
Have anyone managed to get a look inside this cover model? Or do you have a scheme of it, a technical drawing?

quite a fancy rocker cover. Are the oil ways feeding the top halfs of the camshaft bearings? The large steel plate that seems to be rivoted onto the aluminium cover is I guess a baffle to stop splashing oil from going into the breather exit. Maybe if the cover is bent and those oil ways are not sealing you could get oil spraying under the baffle?