I'm planning to remove the valve cover gasket on my 1991 M103 (to replace the valve guide seals) and was wondering if the gasket should go back on dry or use gasket sealer, and if so what kind. I have some Ultra Blue silicone that works good.

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)

If your valve cover gasket is more then three month old replace it with new one. hope this help

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MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner

I already bought a new gasket. I have the service CD but I couldn't find anything about it. I also couldn't find the torque specs for it, does anybody know what they are?

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)

I used to have a 190e 2.3 euro, when I replaced the valve cover gasket, I put it on dry and torqued the bolts to 11 ft-lbs.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

Should go on dry. Make sure both surfaces are clean and dry. Do not overtighten!! This will distort the valve cover and it will leak for sure..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.

Is there a way to replace valve seals by just removing the valve cover?

Sixto
78 450SEL ... in a million pieces to replace valve seals
91 300SE

Sixto, to replace valve seals, valve cover has to come off. Also valve springs and keepers as well. You will need valve spring compressor and air chuck adapter to blow compressed air into the cylinders to keep the valves shut whilst removing springs and replacing seals.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.

Oh. On an M117, I haven't found a tool that will allow me to replace the valve seals with the head attached. Is there a special tool to do what you described on a M103 or will a generic American V8 in situ compressor work? I've never looked under my M103 valve cover. This is more out of curiosity since I suspect my head gasket is leaking

Thanks,
Sixto
78 450SEL
91 300SE