PCV Valve on 1971 250c? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 01-28-2008, 01:31 PM Thread Starter
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PCV Valve on 1971 250c?

Hello Everyone,
I have a question about my 1971 250c and hope that someone can help. At the base of the rubber line that runs from the air cleaner down to the base of the carb. there appears to be a pcv valve. The old one had a 1/2" long cylindrical rod (magnetic) inserted into the opening. The new replacement did not have the insert. Did the original have this insert or did someone add it trying to put a band-aid on a problem? I know longer have the original and need a source for this part if it does exist.
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post #2 of 3 (permalink) Old 02-12-2008, 02:37 PM
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I don't recall a PCV valve. There is plumbing in the air cleaner that connects to the breather hose attached to the valve cover. There is a metal tube on the bottom of the air cleaner that goes into a cone-shaped fitting that in turn connects to the intake manifold.

Where do you think the valve is placed?
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post #3 of 3 (permalink) Old 02-28-2008, 12:54 PM
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No PCV valve, just a crankcase breather line from intake manifold directly into the air cleaner assembly. The correct assembly should have a plastic tube with a bend in it, topped with a funnel shaped rubber adapter piece that guides the air lower air cleaner discharge tube into alignment.

People often replace the correct assembly with a piece of hose, as I am not sure the correct piece is available anymore.

There should be no metallic rods or pieces in this at all. The idea is that the breather hose from the value cover goes into the air cleaner and the base of the air cleaner connects into the intake manifold forming a continuous connection that scavenges the crankcase fumes with no PCV value.

Good luck,

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