Why, oh why, would a hole be in the valve cover, if there is already a CCV? Wouldnt this also affect the vacuum of it?

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Lotus 7 replica-20valve 4AGE
06' 500R Ninja Naked/Café/Custom
86' 300 SDL (Donor)
98' Discovery 50th anniversary (Recipient of transplant)

MB put the hole there for a reason... I forget now what it is. perhaps it's to alert you when the CCV is plugged up? I'd pull the valve cover, and clean out the vent mechanism. I'd also clean out the crossover tube while it was out... and maybe just maybe close off the EGR, for testing purposes of course...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

My SDL has the same hole....I always wondered what purpose it served.....

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

Pcv and egr are deleted. so im sure it spills out due to there not being suction from the pcv, (k&n filter/breather)

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Lotus 7 replica-20valve 4AGE
06' 500R Ninja Naked/Café/Custom
86' 300 SDL (Donor)
98' Discovery 50th anniversary (Recipient of transplant)

k&n has a bad rep on diesels. Perhaps research to determine if it is true.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

The hole is for blow-by relief. If there is smoke coming out then the engine is suspect and has severe blow by. Do NOT cover the hole, it will blow the main seal. It has nothing to do with vacuum, egr, pcv etc.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

The k&n is just a valve cover breather. not intake filter.

Ah-kay: thanks for clarifying. I just remarked that since i dont have the negative pressure of the intake to draw out the crank case air, that its why it is now leaking out of the hole!

__________________
Lotus 7 replica-20valve 4AGE
06' 500R Ninja Naked/Café/Custom
86' 300 SDL (Donor)
98' Discovery 50th anniversary (Recipient of transplant)