Pcv

[Coaster23]

Looking for a visual reference to cleaning a bellows type pcv system. The article written by Paul240480 no longer has available photos. Cheers in advance.

[Clifford Pope]

May be some models have other kinds, but the only 240 pcv system I know has flame trap (small black thing looking a bit like a party-popper) connected by a thin pipe to the inlet manifold, and a black oil separator box mounted on the engine block next to the dipstick tube. Oil mist is separated in the black box and runs back into the sump, and crankcase gases drawn either into the inlet manifold or into the air intake just upstream of the throttle body.

The flame trap, its thin pipe and the manifold nipple are well worth cleaning out regularly.
The black box unbolts, but is fiddly to extract with very little clearance under the manifold, but can be done without any other dismantling. in theory it can be washed out in parafin, but if it has never been done until now it will probably be caked up inside with carbon gunge, so it's easier just to replace it.

By bellows do you mean the convoluted air intake duct? Be careful if removoing for cleaning - it's very prone to developing hairline cracks along the ridges.

[Coaster23]

Thanks Clifford, working on a later type 240 which has a different pcv to my previous 240 B21A engine. Have done an S60 and C70 in the past but just couldn’t find any refs to this engine type on the internet , only paul240480 on the forum articles but the pictures are no longer there. Have a manual on the way I expect this should cover it, but don’t know. Appreciate you response and comments. Cheers.

[Stephen Edwin]

Originally Posted by Clifford Pope

May be some models have other kinds, but the only 240 pcv system I know has flame trap (small black thing looking a bit like a party-popper) connected by a thin pipe to the inlet manifold, and a black oil separator box mounted on the engine block next to the dipstick tube. Oil mist is separated in the black box and runs back into the sump, and crankcase gases drawn either into the inlet manifold or into the air intake just upstream of the throttle body.

The flame trap, its thin pipe and the manifold nipple are well worth cleaning out regularly.
The black box unbolts, but is fiddly to extract with very little clearance under the manifold, but can be done without any other dismantling. in theory it can be washed out in parafin, but if it has never been done until now it will probably be caked up inside with carbon gunge, so it's easier just to replace it.

By bellows do you mean the convoluted air intake duct? Be careful if removoing for cleaning - it's very prone to developing hairline cracks along the ridges.

I should like to see some guidance on how little or how much has to be undone to get good clearance for that job. Please.

The heating might be turned on outside soon so I will have little excuse to defer the task.

God must be a woman. She turns off the heating in winter when we really need it.


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[Clifford Pope]

Originally Posted by Stephen Edwin

I should like to see some guidance on how little or how much has to be undone to get good clearance for that job. Please.



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The usual advice is to unbolt the inlet manifold and lift it clear.

I have done it without dismantling, other than freeing the clip that holds the wiring harness in place over the top of the box. On removing the bolt that holds the box tothe block, it will just lift vertically enough to get the locating plastic projection on the base clear of its hole, with about 1/2 mm to spare!

Be very carefully not to bend the lower part of the box as it gets fragile over time with the heat and easily falls to pieces into the sump.
Putting a new one in I realised that the lug on top of the box, which is what fouls the manifold, appears to serve no purpose other than to hold the harness clip. I just cut it off and used a cable tie on one of the nearby hoses.

While you have the box off it might be a good opportunity to get better access to the heater hoses, and also the coolant temperature sensor if you want to check it.

[Coaster23]

Bellows circled in red.

[Clifford Pope]

That's a K-jet injection system. I've never had one - clearly at has a different kind of pcv set-up from the LH one.

The same principles must apply - remove the bits, noting how they fit, clean them out, refit? Presumably there's a small orifice into the manifold to get vacuum? Or does it rely entirely on lowered air intake pressure to draw out fumes?
There are K-jet experts here - not me.

[Coaster23]

Manual covering this model arrived today so all is good, it’s certainly clogged up. Thanks for your reply, much appreciated . Cheers