Hi everyone. Just joined the other day when my Cooper S started giving me grief. Does anyone know the ins and outs of pcv valves?

I took the pcv valve off my Mk2 S, because it was hooked up all wrong. It was all oily so I gave it a clean. When i had it all appart I noticed insidde the base part is a type of valve and spring arrangement. Well it was a type of valve in mine, because it actually fell out. Not the rubber bit and spring that fits into it, but a very small thing like a 5 cent piece size. It was right inside the base part of the pcv. Before you couldn't see through it and now you can see straight through.

The engine is smokey now and it never was before. I wonder whether oil is being sucked straight through it now?

Thank you.

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Sounds like something is wrong or missing.
Take a look at this diagram and see what wrong.

The disc valve (part 16 above) should be about 40mm in diam.
I have seen them corrode away to nothing. Check the rubber diaphragm for holes

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1967 Cooper S - new front bearings to do.
1965 Cooper S shell - Slow progress. No time or money!
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.

The flexible rubber diaphragms go hard with age, then don't close off properly with vacuum. Result= smoky motor untill the diaphragm warms up.
If it feels hard, replace it too.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Ah Haaa!!!, not alot of people would know this, but there is also another valve plate/flap thing under the 4 pronged thing ""INSIDE" the valve body... If that has broken off &/or fallen out then it`s rooted, get another one

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I've noticed them, and thought the same when he said he could look right through it. Can they be replaced? I thought they were built in or something.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.