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How To Replace Your Ccv Valve - M54 Engine

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Hiya :) first post! First of all, superb instruction. Now, being a bit tight with the cash at the mo, if I'm extra careful not to break any of the clips, is it possible to just take it all apart and clean out any gunk with a degreaser (method, hot soapy water etc) then stick it all back together, instead of forking out for new parts?

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Iv just been reading up about the ccv, to diagnosis a faulty ccv it says start the engine take the oil cap off and put a bag over it and you should feel it sucking in, and another way is to remove dipstick and put a balloon over it and it should inflate, are both these ways correct, one sucking and one blowing? (Don't mean to sound dirty lol)

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Hiya :) first post! First of all, superb instruction. Now, being a bit tight with the cash at the mo, if I'm extra careful not to break any of the clips, is it possible to just take it all apart and clean out any gunk with a degreaser (method, hot soapy water etc) then stick it all back together, instead of forking out for new parts?

I would seriously wait until you've got the cash to buy replacements. The hoses will be very brittle and you're 99% certain to snap something which will leave you with a non runner.

You'll also have a real job cleaning everything out, and you pretty much have to snap the valve to get it open to clean the inside of that. For the sake of £90 I'd wait.

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Iv just been reading up about the ccv, to diagnosis a faulty ccv it says start the engine take the oil cap off and put a bag over it and you should feel it sucking in, and another way is to remove dipstick and put a balloon over it and it should inflate, are both these ways correct, one sucking and one blowing? (Don't mean to sound dirty lol)

I believe that the balloon on the dipstick is the best indicator as it would show what's happening after the seperator valve stage. It should inflate if everything's working properly as the valve diverts the oily breather gases back into the sump via the dipstick.

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Iv just been reading up about the ccv, to diagnosis a faulty ccv it says start the engine take the oil cap off and put a bag over it and you should feel it sucking in, and another way is to remove dipstick and put a balloon over it and it should inflate, are both these ways correct, one sucking and one blowing? (Don't mean to sound dirty lol)
I believe that the balloon on the dipstick is the best indicator as it would show what's happening after the seperator valve stage. It should inflate if everything's working properly as the valve diverts the oily breather gases back into the sump via the dipstick.
Yeah I was thinking that but I read somewhere that if the balloon inflates it means the ccv is ok?
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Iv just been reading up about the ccv, to diagnosis a faulty ccv it says start the engine take the oil cap off and put a bag over it and you should feel it sucking in, and another way is to remove dipstick and put a balloon over it and it should inflate, are both these ways correct, one sucking and one blowing? (Don't mean to sound dirty lol)

I believe that the balloon on the dipstick is the best indicator as it would show what's happening after the seperator valve stage. It should inflate if everything's working properly as the valve diverts the oily breather gases back into the sump via the dipstick.

Yeah I was thinking that but I read somewhere that if the balloon inflates it means the ccv is ok?

Correct.
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No sorry I mean if the ballon inflates you need to replace the ccv??

I think if the balloon inflates the ccv is fine, but don't quote me on it you'll have to google it.

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No sorry I mean if the ballon inflates you need to replace the ccv??
I think if the balloon inflates the ccv is fine, but don't quote me on it you'll have to google it.
Yeah I googled it but it didn't make it that clear, I was getting mixed answers lol, I think I need to replace the ccv on my 325, I took the oil cap off and put a bag over it and it was trying to suck it in, so then I took the dipstick out and done the same with that and the bag was trying to get sucked in aswell, I'm so confused can't work it out
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Interesting topic I always read that the 3 liter engine drunk a lot of oil and always wondered why well now I know....

Are there any real noticable changes what do I look out for.... my 330 has done 88K and is an 02 plate is this a mileage thing or is it age related too like cambelts etc?

Lee F

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Interesting topic I always read that the 3 liter engine drunk a lot of oil and always wondered why well now I know....

Are there any real noticable changes what do I look out for.... my 330 has done 88K and is an 02 plate is this a mileage thing or is it age related too like cambelts etc?

Lee F

Out of the two it would be a mileage related weak point because its to do with the amount of oil vapour that the valve has to do with over the years which causes it to clog up.

Its not as straight forward as that though because there are loads of other factors that come into how often this will need doing.... how cold the climate is in your part of the world, what oil you use, how you drive, etc etc.

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Well its always cold here, but then that could just be my age, how its been driven I don't know for sure but a woman owned it I rest my case!!! ^_^

Its due an oil service so as soon as its back from the paintshop I will have a close look at the condition of what ever pipes I can get to and investigate it... If I see tell tale signs of any kind of sludging I will order the parts.

Thanks for the advice

Lee F

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Another good indication is if you take off your disa valve you'll find oil residue if it needs doing as oil vapour get sucked into the inlet manifold if the separator valve is blocked.

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Are there any visual tell tale signs of my M54 needed this done? Apart from oil consumption?

As above, your intake manifold will be fairly oily if its gone as oil vapours get sucked into it instead of going down the dipstick and back into the sump.

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Yes,just take the disa valve out and any oil residue will be fairly obvious. It's normally a hint that things aren't right if it's too bad, bearing in mind that older engines will have a slight build up in the intake anyway, but too much is usually down to a goosed separator valve.

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