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#1
10-13-2004, 04:59 PM
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valve cover for 79 300 sd turbo
79 300 sd has a blown valve cover gasket. We are told that this is a faulty design that has been dedesigned and we need to buy a new valve cover and hose to do the job right.
Have any of you run into this? Is there a later model interchange for this? Do we have to go to Mercedes to get the update. Is there another solution? 
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#2
10-13-2004, 05:31 PM
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I've never heard of such a thing. Just go here on fastlane and buy a valve cover gasket.
Thanks David
__________________
_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________
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#3
10-13-2004, 05:48 PM
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That sounds crazy, replace the gasket; UNLESS the valve cover is damaged by someone over torqueing the vc nuts. I've got a used valve cover from an '82 if you need to replace the cover....
__________________
Over 21 years I owned several: w108 w110 w111 w115 w116 w123 w124 w126 w212
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#4
10-13-2004, 10:45 PM
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The new improved breather hose is flat instead of round. It might have an internal baffle too. Look on the bottom of your valve cover and you will find 'stops' the VC rests on that limit pressure applied to the gasket. These stop points can be filed down so more pressure can be applied to the gasket.
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#5
10-13-2004, 11:41 PM
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The new improved breather hose is flat instead of round. It might have an internal baffle too.
The '79 SD should have a different breather hose than the 300D turbos; it didn't have an EGR and the breather was vented directly to the Turbo "U" pipe, not the top of the air cleaner housing....
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#6
10-14-2004, 12:04 AM
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On my '79 240D the breather goes into the intake manifold *below* the air cleaner. The intake manny is always a little wet, but the air cleaner never gets fouled with oil. I like to rotate the air filter too, so a fresh section gets exposed to the air cleaner cover opening. It amazed me to learn they had several variations of breather systems, some with oil/vapor separators. Crusher, you are probably correct there are fiddly bits, and lack of the same, specific to the '79 300SD. For an "oil collector" I jammed heavy mesh stainless steel wool loosely into the breather pipe inside the valve cover, hoping it would trap oil - a homemade remedy modeled on the primitive oil bath air filter. The VC "stops" I mentioned for filing down are alloy nibs that contact the cyl head alongside the gasket. Copper washers are good idea for the hold down bolts too. You dont want to crack the VC by overtorquing it. Last edited by 300SDog; 10-14-2004 at 12:26 AM.
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