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Zetec breathing issue


Benrobson2999 - Kent AO

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So today I made the most of the sun and had a a bit of a blast ☀️ 

 

when I got home I noticed a dribble of oil. Upon investigation oil was on the pedal box cover. (See pic) I removed the air filter and body. I would guess it’s breathing oil out into the air filter housing and also through the red breather. I removed the red breather and it’s not as easy as I would imagine to blow through it. The car was running ok. Oil level is good. Any suggestions? I was driving it quite hard.

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In your 5th photo, you seem to be holding the main crank breather hose. Where is that connected? It shouldn't end up in the intake air filter. 

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See photo 4. The red breather connects to the rocker cover.

I wonder if it’s sucked a little of what’s blown out into the main air filter?

there is also the hose that goes into the air filter body housing? 

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Just now, Benrobson2999 said:

See photo 4. The red breather connects to the rocker cover.

I wonder if it’s sucked a little of what’s blown out into the main air filter?

there is also the hose that goes into the air filter body housing? 

That's what I was asking 🙂 the air filter body housing shouldn't have a hose going into it, or oil mist will end up ruining the filter and will drip onto the pedal box area as that pipe heads downhill... That crank case vent would normally go to the intake manifold downstream of the throttle body. Can you show a better photo of that? The red breather is how the engine normally breathes at full load - this can connect to a catch can, or to a horizontal portion of the intake duct upstream of the throttle (or can have a little filter, but that will always drip a bit)

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I will have another look. Just cleaned the red filter. Carb cleaner and air line. It was pretty oily and not free flowing. You can blow through that easy now

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Here is the hose I think you mean

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  • Benrobson2999 - Kent AO changed the title to Zetec breathing issue

Yes, that hose. But where do you have it connected? Originally it should have been connected to a large spigot on the manifold (one of the ones that looks capped off)

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It is connected into the air filter housing as you said it shouldn’t be. Iam sure this is how the manual suggested to

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I have a similar air filter arrangement and it definitely doesn't have that inlet. If the camcase breather has been connected to there then that's your problem. If you're gonna track it, needs to go to a catch tank. 

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That connector goes to the crank case breather. The cam cover has the red breather.

 

just googled oil catch tanks. How does this sound? Would a 1 ltr size suffice?

https://www.demon-tweeks.com/uk/mocal-alloy-oil-catch-tank-245403/ 

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1L is plenty, Mocal are very good because they have a breathable cap. I'd just run both crank and cam breathers to that and block off the spigot underneath your intake pipe. If you mount the tank high up, oil vapour will tend to drain back to the engine, which helps too.

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Ok thanks. Do you mean blank off the elbow fitting on the bottom of the air intake

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1 minute ago, Benrobson2999 said:

Ok thanks. Do you mean blank off the elbow fitting on the bottom of the air intake

sorry, yes - blank that elbow fitting off

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