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valve cover seal questions
Topic Started: Mon Nov 20, 2017 11:59 am (406 Views)
darsy
Newbie
[ * ]
Hi
I have a correct MB valve cover gasket. The recent febi one I installed is pooling oil at the semi-circular bit at the front of the engine ....M102 4 cylinder 1990 2.0 petrol.
Will I use a gasket maker with it when installing? which type/brand?
I would like one that is easy to remove after.

I was also thinking of removing and cleaning the plastic box on the underside of the valve cover In case it is blocked thus causing excess pressure inside and forcing oil out between the valve cover gasket. The breather which leads to the air filter box. When I remove the screws it is still stuck down. How should it be removed? How should it be re-sealed? If I detach the airbox and breather pipe, what kind of pressure should it be blowing out?

Profoundliest registrations,
D.
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scherrit
Part of things
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Regarding the underside of the cover.... I think all that cover etc is to separate some oil from the crankcase venting before it blows out into the aircleaner (and also vents to the idle control on my M102.962) the cover should come off once the screws are loose, but there is a pipe (some sort of plastic??) which is a press fit which might be holding the cover onto the valve cover/cam cover. There is no seal between these two and I would be hesitant to use silicone or anything that might degrade with oil and heat temp, and land up blocking an oilway.
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optimusprime
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You might have a shock when you remove it .The paint they spray them with gets inside the cover .After time it will flake and fall off in to the oilways .So do malke sure its nice and clean on refitting it .Clean out the breather holes in the side of the valve cover it helps the engine breath,one is small one large .. .And you dont need a sealant on it, but set the bolts to 10 nm on assembly .
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darsy
Newbie
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scherrit
Mon Nov 20, 2017 12:24 pm
Regarding the underside of the cover.... I think all that cover etc is to separate some oil from the crankcase venting before it blows out into the aircleaner (and also vents to the idle control on my M102.962) the cover should come off once the screws are loose, but there is a pipe (some sort of plastic??) which is a press fit which might be holding the cover onto the valve cover/cam cover. There is no seal between these two and I would be hesitant to use silicone or anything that might degrade with oil and heat temp, and land up blocking an oilway.
That is valuable information. I ll get back when i get around to doing the job. No seal needed between the oil seperator and underside of the valve cover: understood. What about some squeezy gasket used with the new mb rubber gasket?
Thank you.
Edited by darsy, Mon Nov 20, 2017 11:04 pm.
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darsy
Newbie
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optimusprime
Mon Nov 20, 2017 8:43 pm
You might have a shock when you remove it .The paint they spray them with gets inside the cover .After time it will flake and fall off in to the oilways .So do malke sure its nice and clean on refitting it .Clean out the breather holes in the side of the valve cover it helps the engine breath,one is small one large .. .And you dont need a sealant on it, but set the bolts to 10 nm on assembly .
No sealer between the breather compartment attached to the underside of the valve cover ok.
Thing is: i have replaced the valve cover gasket properly and retorqued the nuts correctly, but it still leaks. This is why i either want to either use some gasket maker with my new mb valve cover gasket or find the cause for this persistent leak....too much pressure inside perhaps?
How much blow should there be from the breather?

Thank you for the info.
D
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stwat
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You shouldn't use sealant when fitting the valve cover gasket.
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darsy
Newbie
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stwat
Mon Nov 20, 2017 10:56 pm
You shouldn't use sealant when fitting the valve cover gasket.
Ok i won t use any gasket maker on the valve cover. If the valve cover isn t warped, what could be the problem? Presume my car has been well maintined. 93000 miles. Or are the possibilities boundless?
Thanks
D.
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darsy
Newbie
[ * ]
Before i take off the valve cover to possibly remove and clean out the oil seperator i would like to know how much pressure there should be coming from the breather hose?
I.e. with the air filter housing off and my finger over the top of the breather hose should i feel a lot of 'blow'?
The breather hose itself is clean. With the enging running there is a gentle flow of air with the occasional atom or two of oil spitting.
Thank you
D.
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optimusprime
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You need to get original mercedes valve cover gasket .And no, dont use salant .
But you do need to torque the valve covers down to the right specs so its level if its just locked down without doing this then it will leak..
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darsy
Newbie
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optimusprime
Sun Dec 3, 2017 2:16 pm
You need to get original mercedes valve cover gasket .And no, dont use salant .
But you do need to torque the valve covers down to the right specs so its level if its just locked down without doing this then it will leak..

I have the correct mb gasket. I didn t think the torque settings were that crucial. Great if it stops the bleeding. Any idea of the torque setting and specific order in which the bolts need to be tightened? 1990 2.0 petrol m102 4 cylinder without self-levelling suspension.

Thanks for the reply
D.
Edited by darsy, Tue Dec 5, 2017 10:07 pm.
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Daliscar
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Always On The Ball
[ *  *  *  *  *  *  *  *  * ]
Cambox torque settings 15Nm sequence is from the front, 1 right 2 left 3 left 4 right 5 left.
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darsy
Newbie
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Daliscar
Wed Dec 6, 2017 12:20 am
Cambox torque settings 15Nm sequence is from the front, 1 right 2 left 3 left 4 right 5 left.


I ll get a little torque wrench. Is "1 right" etc my right when facing the engine?

Thank you for the information
D.
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Daliscar
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Always On The Ball
[ *  *  *  *  *  *  *  *  * ]
You've got it! Facing the lump, yout tight and onwards.
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darsy
Newbie
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Daliscar
Thu Dec 7, 2017 10:28 pm
You've got it! Facing the lump, yout tight and onwards.
Great stuff thanks
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optimusprime
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Part of things
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My valve cover on my engine is set to 6 nm . No leaks .And if I need to remove it at any time I can , then take it down to 10 nm . No sealant . But my friend did his 2x and in the end used a sealant .Trouble with sealant is, on removal, it can get in to the valves and oil ways .,
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Tim190e
Part of things
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I have had an issue with rocker cover oi leak, replaced the gasket with a genuine one, still had a leak...I replaced the breather pipe and the leak stopped, the oil was leaking at the cover connection and tracking along the cover, the pipe had gone hard..
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