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  #1  
Old 09-07-2017, 03:34 PM
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Join Date: Apr 2017
Location: Orinda, CA (SF Bay Area)
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Part ID / Function

Hey again, Everyone...

I've got my valve cover off (1978 280ce) for a valve clearance check, and have discovered a cracked part, which appears to be some sort of crankcase ventilation / drainage / check-valve component. Can anyone help identify this, and offer advice on its function?

It's not even shown in my MBZ engine/chassis/unit catalog, so I'm at a loss.

Thanks in advance (again)..

-greg
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Part ID / Function-img_0394-1-.jpg   Part ID / Function-img_0395-1-.jpg  
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Filmmaker, Dad, Citizen of the World in the San Francisco Bay Area
===current stable===
'78 280CE (acquired April 2017)
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  #2  
Old 09-07-2017, 03:56 PM
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Join Date: Dec 2016
Posts: 29
Looks like a vacuum line. Under the intake manifold there are many, but it is almost impossible to tell what it should be connected to from the picture.

On my 280slc there is a vacuum line that goes from the throttle body (close-ish from where yours is) to the other side of the engine compartment, under the water reservoir.

Do you have the workshop manual for the engine?

EDIT: Forget that. You are referring to the black vertical tube? If so, that's the positive crank case ventilation system.

Last edited by rbtoj; 09-07-2017 at 05:30 PM.
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  #3  
Old 09-07-2017, 06:42 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 3,736
It's sort of a "blow by" tube which is connected to the EGR system. When the EGR is opened a sliding piston opens on the intake manifold and pulls any vapors into the intake to be burned.

PITA to replace. The "easiest" way is to pull the intake manifold. It makes a slobbering mess when it cracks all the way though.
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  #4  
Old 09-07-2017, 08:29 PM
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Join Date: Apr 2017
Location: Orinda, CA (SF Bay Area)
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Quote:
Originally Posted by Mike D View Post
It's sort of a "blow by" tube which is connected to the EGR system. When the EGR is opened a sliding piston opens on the intake manifold and pulls any vapors into the intake to be burned.

PITA to replace. The "easiest" way is to pull the intake manifold. It makes a slobbering mess when it cracks all the way though.
Makes sense... Maybe I should hold off on re-activating my EGR system (air pump is seized and long-disconnected) until I address this issue, first. Need to get the car ready for it's San Francisco to Chicago & back trip starting on Sept 23rd! The gunk around it / below it seems like it's been there a long time, probably around when the previous owner disconnected the air pump.

Thank you!

-greg
__________________
----------------------------------------------------------------------------
Filmmaker, Dad, Citizen of the World in the San Francisco Bay Area
===current stable===
'78 280CE (acquired April 2017)
'16 Honda Odyssey (kid transporter / adventure wagon)
'16 Chevy Volt (commuter car)
===past notable stable===
'73 VW Thing "Clem"
'73 VW Thing "Astro"
'72 Porsche 914
'68 VW Squareback
'41 Oldsmobile Model 78
'6? Autodynamics Deserter
'05 Jaguar S-Type
'08 Honda Element 4WD EX
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