6n2 1.0 oil breather problems

Joshh6n2 · Post by **Joshh6n2** » Fri Oct 26, 2012 10:34 am

Hi I'm having problems with a lot of oil coming out of my oil breather which comes off the rocker cover, how much oil should actually come out of hear if any? I don't want that oil going down my inlet. I first noticed when I acidently left the breather off my air box then after a while of driving I smelt oil so popped the bonnet to find loads of oil in my engine bay. Any help is appreciated

Post by **alexperkins** » Fri Oct 26, 2012 12:19 pm

Have you still got the factory airbox fitted?

You will get some oil vapour out of the left hand pipe, but it shouldnt be that much.

rover220 · Post by **rover220** » Fri Oct 26, 2012 12:55 pm

Piston rings are worn i bet.

Get it compression tested.

Joshh6n2 · Post by **Joshh6n2** » Fri Oct 26, 2012 1:05 pm

Ye I did have te factory box fitted then fitted a k&n induction kit filter and led the breather to te filter and now there's engine oil all over my new k&n

And I was thinking it could be piston rings, I'll have to check compression then but I hope it isn't the rings

Post by **alexperkins** » Fri Oct 26, 2012 1:09 pm

I can tell you exactly what it is

On a 1.0 there is a second pipe that comes out of the rocker box cover. In the factory airbox, this has a one way valve on it that allows air INTO the pipe, but it cannot breathe outwards

If you do not have a one way valve on this pipe and have fitted a breather to this secondary pipe, itll spew oil everywhere very quickly.

The only pipe with a filter on it should be the left hand side crank case breather which is the bigger of the two tubes.

georgen · Post by **georgen** » Fri Oct 26, 2012 3:07 pm

alexperkins wrote:I can tell you exactly what it is

On a 1.0 there is a second pipe that comes out of the rocker box cover. In the factory airbox, this has a one way valve on it that allows air INTO the pipe, but it cannot breathe outwards

If you do not have a one way valve on this pipe and have fitted a breather to this secondary pipe, itll spew oil everywhere very quickly.

The only pipe with a filter on it should be the left hand side crank case breather which is the bigger of the two tubes.

A pcv valve, it stays open on tickover and as revs go up it shuts, sometimes they stick open allowing oil to go straight into airbox.

Post by **alexperkins** » Fri Oct 26, 2012 3:11 pm

It is and isnt a PCV valve. It has a one way breather on it, which will not allow it to breathe out ever. It can only breathe in

georgen · Post by **georgen** » Fri Oct 26, 2012 6:59 pm

alexperkins wrote:It is and isnt a PCV valve. It has a one way breather on it, which will not allow it to breathe out ever. It can only breathe in

Well thats cleared that one up, so it aint but does the same job Kinda

Joshh6n2 · Post by **Joshh6n2** » Fri Oct 26, 2012 8:06 pm

Thanks for the replies, so how do people have induction kits on there 1.0? Can I not have one then and am I just gunna have to put my factory air box on? Cheers

benmkiv · Post by **benmkiv** » Fri Oct 26, 2012 8:15 pm

Had so much rubbish with these things .(

Post by **alexperkins** » Fri Oct 26, 2012 8:20 pm

I fixed it by putting a one way valve onto the pipe with a little filter on the end

I've also fixed it by using parts of the old airbox though its a bit of a cheeky method

Search on eBay for one way valves that match the diameter you need

benmkiv · Post by **benmkiv** » Fri Oct 26, 2012 8:58 pm

I gave up in the end hah being a 1.0 the BMC was a waste of time personally.

BenGTI · Post by **BenGTI** » Fri Oct 26, 2012 9:39 pm

Sounds like piston rings are goosed. Happens to my 6n2 gti. Spitting oil out the breather.

Is the car using/burning oil?

Post by **alexperkins** » Fri Oct 26, 2012 9:56 pm

@ben. It's not the normal crankcase breather in question.

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