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  #1  
Old 03-20-2014, 09:26 AM
jonathan willner
 
Join Date: Sep 2011
Location: ontario canada
Posts: 3
Question pressur in cylinder cover

I have a 85 300D turbo with over 200K miles .starts even at -20c. good acceleration. good on "gas". BUT pressure is built under the valve cover that causes oil to leak out of the oil filling cap. mainly after idling.
no pressure leak from dip stick.
any suggestions.
Jonathan
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  #2  
Old 07-12-2014, 11:22 AM
scottmcphee's Avatar
1987 w124 300D
 
Join Date: Mar 2008
Location: Edmonton, Canada
Posts: 1,539
I suggest you have blowby.


This is normally vented back into intake through recirculation valving or just a direct pipe from valve cover to intake. Which may be controlled by vacuum, so that more is accepted at high rpm and less is accepted into the intake at low rpm...

Do not obstruct that pipe. Just don't.
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1987 300D
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  #3  
Old 07-12-2014, 09:39 PM
Mölyapina's Avatar
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Location: Chelmsford, Massachusetts
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There's a seal on the oil cap. Might want to check that, too.
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

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  #4  
Old 07-15-2014, 07:53 AM
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cho cho is offline
diesel power
 
Join Date: Dec 2011
Location: Europe
Posts: 933
Quote:
Originally Posted by Jooseppi Luna View Post
There's a seal on the oil cap. Might want to check that, too.
x2

....you can flap the seal for better sealing...


edit : flap .....nope I meant flip
.
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Last edited by cho; 07-17-2014 at 09:38 AM. Reason: language confusion
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  #5  
Old 07-15-2014, 07:55 PM
Mölyapina's Avatar
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Quote:
Originally Posted by cho View Post
x2

....you can flap the seal for better sealing...


.
Or just glue the cap on.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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