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Old 18-01-2021   #1
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Fiat 500 1.2 2017 valve cover leak not from gasket

Hi there I have my mums fiat 500 and noticed it had no oil so
i changed the oil and filter and cleaned up the engine to see where the leak was coming from and I found that it is coming from a small vent hole on the middle of the valve cover could anyone tell me why this is happening and how I can resolve the problem any help would be very much appreciated i have included a pic
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Old 18-01-2021   #2
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Hi and welcome what engine is this and what year?
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Old 18-01-2021   #3
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Hi there its a 2017 fiat 500 with the 1.2 fire engine im sorry but I don't know the exact code.
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Old 18-01-2021   #4
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

My mistake it's in the title, is it possible a breather hose is missing?
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Old 18-01-2021   #5
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Not that I'm aware of you can't see it when the air filter is back in place and the only breather hoses are at rear of engine leading to air filter.
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Old 19-01-2021   #6
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

It's obviously leaking out of that bung in the middle.
Strange though as I haven't seen a plastic rocker cover on one of these engines, they must have only started fitting these in the last few years, all the one's I worked on have had alloy covers.

I can't find a part listing or diaghram for that cover, but I reckon it's either damaged/cracked or the bung in loose or there's a failed O ring in it.

It could be the tube/bung is some sort of oil feed to send oil up to lube the valve train, it could have a gauze filter in there to strain out the oil (which would explain the access the bung provides), if that's clogged it might force the oil out.
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Old 19-01-2021   #7
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Hi there its got a vvt solenoid on the rocker and I've had the rocker off but there's a plastic shield inside and also 4 holes with rubber o rings that coincide with 4 oil holes in the head other than that it doesn't look like you can separate these parts to have a look.
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Old 19-01-2021   #8
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

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Old 19-01-2021   #9
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

I've ordered up a new rocker gasket that comes with 4 oil seal for inside the cover i will strip it back down Sunday replace thise o rings and fire some brake cleaner through all the Chambers to make sure there is no crud or blockages in there then see if that makesna diffrence.
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Old 19-01-2021   #10
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Quote Originally Posted by varesecrazy View Post
They aren't showing the latest rocker cover on there, just the alloy ones.
There are some plug/bungs listed but those too come back as metal ones.

Looking at the cylinder head, oil is pumped up through a hole in it and into that tube moulded into the rocker cover (centre of pic), past the leaking bung and into the top of the inside of the rocker cover.
It'll then spread the oil out along the inside/underside of the rocker cover so it lubes up all of the camshaft like a spray bar.

The plastic around that bung has either broken (has someone over tightened it?), the bung come loose or just cracked for some reason.
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Old 19-01-2021   #11
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

The car has only done 17000 miles so as far as I'm aware was getting serviced at dealers the last few years .
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Old 19-01-2021   #12
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

The rocker cover didn't seem over tightened when I took it off and I retightened to 8nm
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Old 25-01-2021   #13
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Hi i took it apart Sunday and changed rocker cover and the 4 O rings inside the cover i also blew out all the passages with compressed air and looked about the leaking bit but it looks like it could be a pressure relief valve and its still leaking .
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Old 27-01-2021   #14
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Quote Originally Posted by Saf22 View Post
Hi i took it apart Sunday and changed rocker cover and the 4 O rings inside the cover i also blew out all the passages with compressed air and looked about the leaking bit but it looks like it could be a pressure relief valve and its still leaking .
I doubt it's a pressure relief valve that relieves all over a hot exhaust manifold!
The cover/engine is vented the other side, the pipe is plumbed in under the airbox.

The older cars had a alloy cam cover and within that are some blanking plugs that look similar to the plug in the centre of the image, except the alloy covers blanks are alloy not plastic, which your appears to be.

The oil is obviously leaking out of or around the plastic plug with the allen key slot in it in the centre of the image, so it's either loose, the seal is perished or missing or the casing around it has cracked.

It's possible if it leaked before you got it, the last owner might have over tightened it and crack something.

I would be tempted to "test" the plug, get the right size allen key in it and put a little anti clock wise pressure on it first to see if it's loose and then a little (Very little) clock wise pressure while checking if the case around it flexes or moves showing up a crack.

I believe the alloy blanking plugs in the alloy cam covers just have some thread seal on them, but without a current parts list I couldn't tell you if there's a O ring behind the plastic ones.

The oil behind the blanking plug is pumped up from the bottom of the engine under some pressure to lube the cam, so any small crack or weak seal and the oil will find it's way out.
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Last edited by Goudrons; 27-01-2021 at 14:12.
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Old 27-01-2021   #15
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Re: Fiat 500 1.2 2017 valve cover leak not from gasket

Quote Originally Posted by Saf22 View Post
The rocker cover didn't seem over tightened when I took it off and I retightened to 8nm
So when you had the cover off was there a hole on the inside of the cover that the bung fills? if yes, wash the cam cover fully degrease it, then fill the rear of the hole with silicone sealant, allow it to cure for at least 24 hours then replace it, probably last forever?

Though that doesn't explain why its started leaking?
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