Looking at my Haynes repair manual, I see a schematic of a diesel PCV. From the oil seperator, is a tube leading down to the crankcase with a check valve on the bottom. If the return tube, or the check valve became clogged from lack of use, or lack of oil changes, wouldn't excessive oil consumption be the result? Anybody see this happen? Would this be something to check in cases of excessive blow by? Thanks, Dusty

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82 240D

Dusty,

I think you're looking at a schematic of the five cylinder system. Every four that I've seen, simply has a tube from the valve cover down to a connection at the intake manifold.

However, you said that you saw a checkvalve at the crankcase. My daughter's five cylinder has the tube, and I was not aware of the check valve, this gives me something to check (no pun intended).

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

If any part of this system becomes blocked, you will be the first to know. The engine will stall and may blow out oil seals. I have seen a tech block one off with a major service by mistake.

I have not ever seen one clog on its own.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Thanks--you saved me a lot of work for nothing. Dusty

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82 240D