Oily hose under the intake manifold

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Rogrr

New Member
Joined
Apr 9, 2017
Messages
22
Location
Isle of Man
Car
C180 w203 2001 132k miles. c180k w203 2006 99956 miles.
Hi

What's the function of the hose that goes from the lower crankcase to a t connection between the intake to cylinder 2 and 3? The bottom connection to the crankcase is leaking oil.
 
Is that the breather hose, so that any volume pulled out under vacuum is replaced? - If you've got oil leaking out of it, that suggests there's some blow-by.
 
Is that the breather hose, so that any volume pulled out under vacuum is replaced? - If you've got oil leaking out of it, that suggests there's some blow-by.

It turns out to be the low to medium load breather. The hose was cracked and the valve came apart when I pulled on it. The bronze nozzles were blocked. I ordered silicone hoses and a valve.
 

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