Mercedes-Benz Forum - View Single Post - M103 Rough idle and vacuum leak
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post #114 of (permalink) Old 01-09-2018, 07:00 AM
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Date registered: May 2016
Vehicle: 1989 W124 260E Saloon. M103 lump.
Posts: 1,618
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I found problems on my m103 after removing the valve cover to replace the gasket seal . On removal I saw lots of old black paint that had come from in side the valve cover .This is the remainder of the spray paint from new .The spray job is done on a jig and if the spray gun is set to low you get lots of over spray get inside the valve cover . This over time will find its way down into the cam shaft and rockers immersed in the oil .So if your in the stage of replacing the valve cover gasket seal , do a good job removing the old paint bubbles inside the valve cover .Clean out both holes in the valve cover for the breathers ,these holes alone can if not kept open cause problems in the breathing system . Paint a thick oil on the inside of the valve cover .Replace the valve cover with a new gasket seal from mb without sealant bolts set to 10nm .Hope this helps .
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