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1980 Mercedes Benz 300sd Oil coming through valve cover tub

Tiny
CKUMELOS
  • MEMBER
  • 1980 MERCEDES BENZ 300SD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
This is actually a 300D, not an sd (I think).I guess the subject about sums it up. What would cause oil to come up through valve cover tube and how do we fix it?

Thanks,
Celeste Kumelos
Monday, October 6th, 2008 AT 1:52 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi ckumelos,

Thank you for the donation.

When engine blowby pressure is high, oil would be pushed out together with the ventilation gases.

The main cause would be worn piston rings and a clogged PCV.

To rectify the problem an engine rebuilt is required.
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Tuesday, October 7th, 2008 AT 1:41 PM
Tiny
CKUMELOS
  • MEMBER
  • 2 POSTS
Well, crap. Not worth the effort. I appreciate the help.
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Tuesday, October 7th, 2008 AT 2:03 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You are welcomed.

Merc tends to have this problem for their older models.
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Tuesday, October 7th, 2008 AT 2:14 PM

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